Chapter 5. Control plane backup and restore 5.1. Backing up etcd etcd is the key-value store for OpenShift Container Platform, which persists the state of all resource objects. Back up your cluster's etcd data regularly and store in a secure location ideally outside the OpenShift Container Platform environment. Do not take an etcd backup before the first certificate rotation completes, which occurs 24 hours after installation, otherwise the backup will contain expired certificates. It is also recommended to take etcd backups during non-peak usage hours because the etcd snapshot has a high I/O cost. Be sure to take an etcd backup before you update your cluster. Taking a backup before you update is important because when you restore your cluster, you must use an etcd backup that was taken from the same z-stream release. For example, an OpenShift Container Platform 4.17.5 cluster must use an etcd backup that was taken from 4.17.5. Important Back up your cluster's etcd data by performing a single invocation of the backup script on a control plane host. Do not take a backup for each control plane host. After you have an etcd backup, you can restore to a cluster state . 5.1.1. Backing up etcd data Follow these steps to back up etcd data by creating an etcd snapshot and backing up the resources for the static pods. This backup can be saved and used at a later time if you need to restore etcd. Important Only save a backup from a single control plane host. Do not take a backup from each control plane host in the cluster. Prerequisites You have access to the cluster as a user with the cluster-admin role. You have checked whether the cluster-wide proxy is enabled. Tip You can check whether the proxy is enabled by reviewing the output of oc get proxy cluster -o yaml . The proxy is enabled if the httpProxy , httpsProxy , and noProxy fields have values set. Procedure Start a debug session as root for a control plane node: USD oc debug --as-root node/<node_name> Change your root directory to /host in the debug shell: sh-4.4# chroot /host If the cluster-wide proxy is enabled, export the NO_PROXY , HTTP_PROXY , and HTTPS_PROXY environment variables by running the following commands: USD export HTTP_PROXY=http://<your_proxy.example.com>:8080 USD export HTTPS_PROXY=https://<your_proxy.example.com>:8080 USD export NO_PROXY=<example.com> Run the cluster-backup.sh script in the debug shell and pass in the location to save the backup to. Tip The cluster-backup.sh script is maintained as a component of the etcd Cluster Operator and is a wrapper around the etcdctl snapshot save command. sh-4.4# /usr/local/bin/cluster-backup.sh /home/core/assets/backup Example script output found latest kube-apiserver: /etc/kubernetes/static-pod-resources/kube-apiserver-pod-6 found latest kube-controller-manager: /etc/kubernetes/static-pod-resources/kube-controller-manager-pod-7 found latest kube-scheduler: /etc/kubernetes/static-pod-resources/kube-scheduler-pod-6 found latest etcd: /etc/kubernetes/static-pod-resources/etcd-pod-3 ede95fe6b88b87ba86a03c15e669fb4aa5bf0991c180d3c6895ce72eaade54a1 etcdctl version: 3.4.14 API version: 3.4 {"level":"info","ts":1624647639.0188997,"caller":"snapshot/v3_snapshot.go:119","msg":"created temporary db file","path":"/home/core/assets/backup/snapshot_2021-06-25_190035.db.part"} {"level":"info","ts":"2021-06-25T19:00:39.030Z","caller":"clientv3/maintenance.go:200","msg":"opened snapshot stream; downloading"} {"level":"info","ts":1624647639.0301006,"caller":"snapshot/v3_snapshot.go:127","msg":"fetching snapshot","endpoint":"https://10.0.0.5:2379"} {"level":"info","ts":"2021-06-25T19:00:40.215Z","caller":"clientv3/maintenance.go:208","msg":"completed snapshot read; closing"} {"level":"info","ts":1624647640.6032252,"caller":"snapshot/v3_snapshot.go:142","msg":"fetched snapshot","endpoint":"https://10.0.0.5:2379","size":"114 MB","took":1.584090459} {"level":"info","ts":1624647640.6047094,"caller":"snapshot/v3_snapshot.go:152","msg":"saved","path":"/home/core/assets/backup/snapshot_2021-06-25_190035.db"} Snapshot saved at /home/core/assets/backup/snapshot_2021-06-25_190035.db {"hash":3866667823,"revision":31407,"totalKey":12828,"totalSize":114446336} snapshot db and kube resources are successfully saved to /home/core/assets/backup In this example, two files are created in the /home/core/assets/backup/ directory on the control plane host: snapshot_<datetimestamp>.db : This file is the etcd snapshot. The cluster-backup.sh script confirms its validity. static_kuberesources_<datetimestamp>.tar.gz : This file contains the resources for the static pods. If etcd encryption is enabled, it also contains the encryption keys for the etcd snapshot. Note If etcd encryption is enabled, it is recommended to store this second file separately from the etcd snapshot for security reasons. However, this file is required to restore from the etcd snapshot. Keep in mind that etcd encryption only encrypts values, not keys. This means that resource types, namespaces, and object names are unencrypted. 5.1.2. Additional resources Recovering an unhealthy etcd cluster 5.1.3. Creating automated etcd backups The automated backup feature for etcd supports both recurring and single backups. Recurring backups create a cron job that starts a single backup each time the job triggers. Important Automating etcd backups is a Technology Preview feature only. Technology Preview features are not supported with Red Hat production service level agreements (SLAs) and might not be functionally complete. Red Hat does not recommend using them in production. These features provide early access to upcoming product features, enabling customers to test functionality and provide feedback during the development process. For more information about the support scope of Red Hat Technology Preview features, see Technology Preview Features Support Scope . 5.1.3.1. Enabling automated etcd backups Follow these steps to enable automated backups for etcd. Warning Enabling the TechPreviewNoUpgrade feature set on your cluster prevents minor version updates. The TechPreviewNoUpgrade feature set cannot be disabled. Do not enable this feature set on production clusters. Prerequisites You have access to the cluster as a user with the cluster-admin role. You have access to the OpenShift CLI ( oc ). Procedure Create a FeatureGate custom resource (CR) file named enable-tech-preview-no-upgrade.yaml with the following contents: apiVersion: config.openshift.io/v1 kind: FeatureGate metadata: name: cluster spec: featureSet: TechPreviewNoUpgrade Apply the CR and enable automated backups: USD oc apply -f enable-tech-preview-no-upgrade.yaml It takes time to enable the related APIs. Verify the creation of the custom resource definition (CRD) by running the following command: USD oc get crd | grep backup Example output backups.config.openshift.io 2023-10-25T13:32:43Z etcdbackups.operator.openshift.io 2023-10-25T13:32:04Z 5.1.3.2. Creating a single etcd backup Follow these steps to create a single etcd backup by creating and applying a custom resource (CR). Prerequisites You have access to the cluster as a user with the cluster-admin role. You have access to the OpenShift CLI ( oc ). You have a PVC to save backup data to. Procedure Create a CR file named etcd-single-backup.yaml with contents such as the following example: apiVersion: operator.openshift.io/v1alpha1 kind: EtcdBackup metadata: name: etcd-single-backup namespace: openshift-etcd spec: pvcName: etcd-backup-pvc 1 1 The name of the persistent volume claim (PVC) to save the backup to. Adjust this value according to your environment. Apply the CR to start a single backup: USD oc apply -f etcd-single-backup.yaml 5.1.3.3. Creating recurring etcd backups Follow these steps to create automated recurring backups of etcd. Use dynamically-provisioned storage to keep the created etcd backup data in a safe, external location if possible. If dynamically-provisioned storage is not available, consider storing the backup data on an NFS share to make backup recovery more accessible. Prerequisites You have access to the cluster as a user with the cluster-admin role. You have access to the OpenShift CLI ( oc ). Procedure If dynamically-provisioned storage is available, complete the following steps to create automated recurring backups: Create a persistent volume claim (PVC) named etcd-backup-pvc.yaml with contents such as the following example: kind: PersistentVolumeClaim apiVersion: v1 metadata: name: etcd-backup-pvc namespace: openshift-etcd spec: accessModes: - ReadWriteOnce resources: requests: storage: 200Gi 1 storageClassName: standard-csi 2 volumeMode: Filesystem 1 The amount of storage available to the PVC. Adjust this value for your requirements. 2 The name of the StorageClass required by the claim. Adjust this value according to your environment. Note Each of the following providers require changes to the accessModes and storageClassName keys: Provider accessModes value storageClassName value AWS with the versioned-installer-efc_operator-ci profile - ReadWriteMany efs-sc Google Cloud Platform - ReadWriteMany filestore-csi Microsoft Azure - ReadWriteMany azurefile-csi Apply the PVC by running the following command: USD oc apply -f etcd-backup-pvc.yaml Verify the creation of the PVC by running the following command: USD oc get pvc Example output NAME STATUS VOLUME CAPACITY ACCESS MODES STORAGECLASS AGE etcd-backup-pvc Pending standard-csi 51s Note Dynamic PVCs stay in the Pending state until they are mounted. If dynamically-provisioned storage is unavailable, create a local storage PVC by completing the following steps: Warning If you delete or otherwise lose access to the node that contains the stored backup data, you can lose data. Create a StorageClass CR file named etcd-backup-local-storage.yaml with the following contents: apiVersion: storage.k8s.io/v1 kind: StorageClass metadata: name: etcd-backup-local-storage provisioner: kubernetes.io/no-provisioner volumeBindingMode: WaitForFirstConsumer Apply the StorageClass CR by running the following command: USD oc apply -f etcd-backup-local-storage.yaml Create a PV named etcd-backup-pv-fs.yaml from the applied StorageClass with content such as the following example: apiVersion: v1 kind: PersistentVolume metadata: name: etcd-backup-pv-fs spec: capacity: storage: 100Gi 1 volumeMode: Filesystem accessModes: - ReadWriteMany persistentVolumeReclaimPolicy: Delete storageClassName: local-storage local: path: /mnt/ nodeAffinity: required: nodeSelectorTerms: - matchExpressions: - key: kubernetes.io/hostname operator: In values: - <example-master-node> 2 1 The amount of storage available to the PV. Adjust this value for your requirements. 2 Replace this value with the node to attach this PV to. Tip Run the following command to list the available nodes: USD oc get nodes Verify the creation of the PV by running the following command: USD oc get pv Example output NAME CAPACITY ACCESS MODES RECLAIM POLICY STATUS CLAIM STORAGECLASS REASON AGE etcd-backup-pv-fs 100Gi RWX Delete Available local-storage 10s Create a PVC named etcd-backup-pvc.yaml with contents such as the following example: kind: PersistentVolumeClaim apiVersion: v1 metadata: name: etcd-backup-pvc spec: accessModes: - ReadWriteMany volumeMode: Filesystem resources: requests: storage: 10Gi 1 storageClassName: local-storage 1 The amount of storage available to the PVC. Adjust this value for your requirements. Apply the PVC by running the following command: USD oc apply -f etcd-backup-pvc.yaml Create a custom resource definition (CRD) file named etcd-recurring-backups.yaml . The contents of the created CRD define the schedule and retention type of automated backups. For the default retention type of RetentionNumber with 15 retained backups, use contents such as the following example: apiVersion: config.openshift.io/v1alpha1 kind: Backup metadata: name: etcd-recurring-backup spec: etcd: schedule: "20 4 * * *" 1 timeZone: "UTC" pvcName: etcd-backup-pvc 1 The CronTab schedule for recurring backups. Adjust this value for your needs. To use retention based on the maximum number of backups, add the following key-value pairs to the etcd key: spec: etcd: retentionPolicy: retentionType: RetentionNumber 1 retentionNumber: maxNumberOfBackups: 5 2 1 The retention type. Defaults to RetentionNumber if unspecified. 2 The maximum number of backups to retain. Adjust this value for your needs. Defaults to 15 backups if unspecified. Warning A known issue causes the number of retained backups to be one greater than the configured value. For retention based on the file size of backups, use the following: spec: etcd: retentionPolicy: retentionType: RetentionSize retentionSize: maxSizeOfBackupsGb: 20 1 1 The maximum file size of the retained backups in gigabytes. Adjust this value for your needs. Defaults to 10 GB if unspecified. Warning A known issue causes the maximum size of retained backups to be up to 10 GB greater than the configured value. Create the cron job defined by the CRD by running the following command: USD oc create -f etcd-recurring-backup.yaml To find the created cron job, run the following command: USD oc get cronjob -n openshift-etcd 5.2. Replacing an unhealthy etcd member This document describes the process to replace a single unhealthy etcd member. This process depends on whether the etcd member is unhealthy because the machine is not running or the node is not ready, or whether it is unhealthy because the etcd pod is crashlooping. Note If you have lost the majority of your control plane hosts, follow the disaster recovery procedure to restore to a cluster state instead of this procedure. If the control plane certificates are not valid on the member being replaced, then you must follow the procedure to recover from expired control plane certificates instead of this procedure. If a control plane node is lost and a new one is created, the etcd cluster Operator handles generating the new TLS certificates and adding the node as an etcd member. 5.2.1. Prerequisites Take an etcd backup prior to replacing an unhealthy etcd member. 5.2.2. Identifying an unhealthy etcd member You can identify if your cluster has an unhealthy etcd member. Prerequisites Access to the cluster as a user with the cluster-admin role. Procedure Check the status of the EtcdMembersAvailable status condition using the following command: USD oc get etcd -o=jsonpath='{range .items[0].status.conditions[?(@.type=="EtcdMembersAvailable")]}{.message}{"\n"}' Review the output: 2 of 3 members are available, ip-10-0-131-183.ec2.internal is unhealthy This example output shows that the ip-10-0-131-183.ec2.internal etcd member is unhealthy. 5.2.3. Determining the state of the unhealthy etcd member The steps to replace an unhealthy etcd member depend on which of the following states your etcd member is in: The machine is not running or the node is not ready The etcd pod is crashlooping This procedure determines which state your etcd member is in. This enables you to know which procedure to follow to replace the unhealthy etcd member. Note If you are aware that the machine is not running or the node is not ready, but you expect it to return to a healthy state soon, then you do not need to perform a procedure to replace the etcd member. The etcd cluster Operator will automatically sync when the machine or node returns to a healthy state. Prerequisites You have access to the cluster as a user with the cluster-admin role. You have identified an unhealthy etcd member. Procedure Determine if the machine is not running : USD oc get machines -A -ojsonpath='{range .items[*]}{@.status.nodeRef.name}{"\t"}{@.status.providerStatus.instanceState}{"\n"}' | grep -v running Example output ip-10-0-131-183.ec2.internal stopped 1 1 This output lists the node and the status of the node's machine. If the status is anything other than running , then the machine is not running . If the machine is not running , then follow the Replacing an unhealthy etcd member whose machine is not running or whose node is not ready procedure. Determine if the node is not ready . If either of the following scenarios are true, then the node is not ready . If the machine is running, then check whether the node is unreachable: USD oc get nodes -o jsonpath='{range .items[*]}{"\n"}{.metadata.name}{"\t"}{range .spec.taints[*]}{.key}{" "}' | grep unreachable Example output ip-10-0-131-183.ec2.internal node-role.kubernetes.io/master node.kubernetes.io/unreachable node.kubernetes.io/unreachable 1 1 If the node is listed with an unreachable taint, then the node is not ready . If the node is still reachable, then check whether the node is listed as NotReady : USD oc get nodes -l node-role.kubernetes.io/master | grep "NotReady" Example output ip-10-0-131-183.ec2.internal NotReady master 122m v1.27.3 1 1 If the node is listed as NotReady , then the node is not ready . If the node is not ready , then follow the Replacing an unhealthy etcd member whose machine is not running or whose node is not ready procedure. Determine if the etcd pod is crashlooping . If the machine is running and the node is ready, then check whether the etcd pod is crashlooping. Verify that all control plane nodes are listed as Ready : USD oc get nodes -l node-role.kubernetes.io/master Example output NAME STATUS ROLES AGE VERSION ip-10-0-131-183.ec2.internal Ready master 6h13m v1.27.3 ip-10-0-164-97.ec2.internal Ready master 6h13m v1.27.3 ip-10-0-154-204.ec2.internal Ready master 6h13m v1.27.3 Check whether the status of an etcd pod is either Error or CrashloopBackoff : USD oc -n openshift-etcd get pods -l k8s-app=etcd Example output etcd-ip-10-0-131-183.ec2.internal 2/3 Error 7 6h9m 1 etcd-ip-10-0-164-97.ec2.internal 3/3 Running 0 6h6m etcd-ip-10-0-154-204.ec2.internal 3/3 Running 0 6h6m 1 Since this status of this pod is Error , then the etcd pod is crashlooping . If the etcd pod is crashlooping , then follow the Replacing an unhealthy etcd member whose etcd pod is crashlooping procedure. 5.2.4. Replacing the unhealthy etcd member Depending on the state of your unhealthy etcd member, use one of the following procedures: Replacing an unhealthy etcd member whose machine is not running or whose node is not ready Replacing an unhealthy etcd member whose etcd pod is crashlooping Replacing an unhealthy stopped baremetal etcd member 5.2.4.1. Replacing an unhealthy etcd member whose machine is not running or whose node is not ready This procedure details the steps to replace an etcd member that is unhealthy either because the machine is not running or because the node is not ready. Note If your cluster uses a control plane machine set, see "Recovering a degraded etcd Operator" in "Troubleshooting the control plane machine set" for a more simple etcd recovery procedure. Prerequisites You have identified the unhealthy etcd member. You have verified that either the machine is not running or the node is not ready. Important You must wait if the other control plane nodes are powered off. The control plane nodes must remain powered off until the replacement of an unhealthy etcd member is complete. You have access to the cluster as a user with the cluster-admin role. You have taken an etcd backup. Important It is important to take an etcd backup before performing this procedure so that your cluster can be restored if you encounter any issues. Procedure Remove the unhealthy member. Choose a pod that is not on the affected node: In a terminal that has access to the cluster as a cluster-admin user, run the following command: USD oc -n openshift-etcd get pods -l k8s-app=etcd Example output etcd-ip-10-0-131-183.ec2.internal 3/3 Running 0 123m etcd-ip-10-0-164-97.ec2.internal 3/3 Running 0 123m etcd-ip-10-0-154-204.ec2.internal 3/3 Running 0 124m Connect to the running etcd container, passing in the name of a pod that is not on the affected node: In a terminal that has access to the cluster as a cluster-admin user, run the following command: USD oc rsh -n openshift-etcd etcd-ip-10-0-154-204.ec2.internal View the member list: sh-4.2# etcdctl member list -w table Example output +------------------+---------+------------------------------+---------------------------+---------------------------+ | ID | STATUS | NAME | PEER ADDRS | CLIENT ADDRS | +------------------+---------+------------------------------+---------------------------+---------------------------+ | 6fc1e7c9db35841d | started | ip-10-0-131-183.ec2.internal | https://10.0.131.183:2380 | https://10.0.131.183:2379 | | 757b6793e2408b6c | started | ip-10-0-164-97.ec2.internal | https://10.0.164.97:2380 | https://10.0.164.97:2379 | | ca8c2990a0aa29d1 | started | ip-10-0-154-204.ec2.internal | https://10.0.154.204:2380 | https://10.0.154.204:2379 | +------------------+---------+------------------------------+---------------------------+---------------------------+ Take note of the ID and the name of the unhealthy etcd member, because these values are needed later in the procedure. The USD etcdctl endpoint health command will list the removed member until the procedure of replacement is finished and a new member is added. Remove the unhealthy etcd member by providing the ID to the etcdctl member remove command: sh-4.2# etcdctl member remove 6fc1e7c9db35841d Example output Member 6fc1e7c9db35841d removed from cluster ead669ce1fbfb346 View the member list again and verify that the member was removed: sh-4.2# etcdctl member list -w table Example output +------------------+---------+------------------------------+---------------------------+---------------------------+ | ID | STATUS | NAME | PEER ADDRS | CLIENT ADDRS | +------------------+---------+------------------------------+---------------------------+---------------------------+ | 757b6793e2408b6c | started | ip-10-0-164-97.ec2.internal | https://10.0.164.97:2380 | https://10.0.164.97:2379 | | ca8c2990a0aa29d1 | started | ip-10-0-154-204.ec2.internal | https://10.0.154.204:2380 | https://10.0.154.204:2379 | +------------------+---------+------------------------------+---------------------------+---------------------------+ You can now exit the node shell. Turn off the quorum guard by entering the following command: USD oc patch etcd/cluster --type=merge -p '{"spec": {"unsupportedConfigOverrides": {"useUnsupportedUnsafeNonHANonProductionUnstableEtcd": true}}}' This command ensures that you can successfully re-create secrets and roll out the static pods. Important After you turn off the quorum guard, the cluster might be unreachable for a short time while the remaining etcd instances reboot to reflect the configuration change. Note etcd cannot tolerate any additional member failure when running with two members. Restarting either remaining member breaks the quorum and causes downtime in your cluster. The quorum guard protects etcd from restarts due to configuration changes that could cause downtime, so it must be disabled to complete this procedure. Delete the affected node by running the following command: USD oc delete node <node_name> Example command USD oc delete node ip-10-0-131-183.ec2.internal Remove the old secrets for the unhealthy etcd member that was removed. List the secrets for the unhealthy etcd member that was removed. USD oc get secrets -n openshift-etcd | grep ip-10-0-131-183.ec2.internal 1 1 Pass in the name of the unhealthy etcd member that you took note of earlier in this procedure. There is a peer, serving, and metrics secret as shown in the following output: Example output etcd-peer-ip-10-0-131-183.ec2.internal kubernetes.io/tls 2 47m etcd-serving-ip-10-0-131-183.ec2.internal kubernetes.io/tls 2 47m etcd-serving-metrics-ip-10-0-131-183.ec2.internal kubernetes.io/tls 2 47m Delete the secrets for the unhealthy etcd member that was removed. Delete the peer secret: USD oc delete secret -n openshift-etcd etcd-peer-ip-10-0-131-183.ec2.internal Delete the serving secret: USD oc delete secret -n openshift-etcd etcd-serving-ip-10-0-131-183.ec2.internal Delete the metrics secret: USD oc delete secret -n openshift-etcd etcd-serving-metrics-ip-10-0-131-183.ec2.internal Delete and re-create the control plane machine. After this machine is re-created, a new revision is forced and etcd scales up automatically. If you are running installer-provisioned infrastructure, or you used the Machine API to create your machines, follow these steps. Otherwise, you must create the new master by using the same method that was used to originally create it. Obtain the machine for the unhealthy member. In a terminal that has access to the cluster as a cluster-admin user, run the following command: USD oc get machines -n openshift-machine-api -o wide Example output NAME PHASE TYPE REGION ZONE AGE NODE PROVIDERID STATE clustername-8qw5l-master-0 Running m4.xlarge us-east-1 us-east-1a 3h37m ip-10-0-131-183.ec2.internal aws:///us-east-1a/i-0ec2782f8287dfb7e stopped 1 clustername-8qw5l-master-1 Running m4.xlarge us-east-1 us-east-1b 3h37m ip-10-0-154-204.ec2.internal aws:///us-east-1b/i-096c349b700a19631 running clustername-8qw5l-master-2 Running m4.xlarge us-east-1 us-east-1c 3h37m ip-10-0-164-97.ec2.internal aws:///us-east-1c/i-02626f1dba9ed5bba running clustername-8qw5l-worker-us-east-1a-wbtgd Running m4.large us-east-1 us-east-1a 3h28m ip-10-0-129-226.ec2.internal aws:///us-east-1a/i-010ef6279b4662ced running clustername-8qw5l-worker-us-east-1b-lrdxb Running m4.large us-east-1 us-east-1b 3h28m ip-10-0-144-248.ec2.internal aws:///us-east-1b/i-0cb45ac45a166173b running clustername-8qw5l-worker-us-east-1c-pkg26 Running m4.large us-east-1 us-east-1c 3h28m ip-10-0-170-181.ec2.internal aws:///us-east-1c/i-06861c00007751b0a running 1 This is the control plane machine for the unhealthy node, ip-10-0-131-183.ec2.internal . Delete the machine of the unhealthy member: USD oc delete machine -n openshift-machine-api clustername-8qw5l-master-0 1 1 Specify the name of the control plane machine for the unhealthy node. A new machine is automatically provisioned after deleting the machine of the unhealthy member. Verify that a new machine has been created: USD oc get machines -n openshift-machine-api -o wide Example output NAME PHASE TYPE REGION ZONE AGE NODE PROVIDERID STATE clustername-8qw5l-master-1 Running m4.xlarge us-east-1 us-east-1b 3h37m ip-10-0-154-204.ec2.internal aws:///us-east-1b/i-096c349b700a19631 running clustername-8qw5l-master-2 Running m4.xlarge us-east-1 us-east-1c 3h37m ip-10-0-164-97.ec2.internal aws:///us-east-1c/i-02626f1dba9ed5bba running clustername-8qw5l-master-3 Provisioning m4.xlarge us-east-1 us-east-1a 85s ip-10-0-133-53.ec2.internal aws:///us-east-1a/i-015b0888fe17bc2c8 running 1 clustername-8qw5l-worker-us-east-1a-wbtgd Running m4.large us-east-1 us-east-1a 3h28m ip-10-0-129-226.ec2.internal aws:///us-east-1a/i-010ef6279b4662ced running clustername-8qw5l-worker-us-east-1b-lrdxb Running m4.large us-east-1 us-east-1b 3h28m ip-10-0-144-248.ec2.internal aws:///us-east-1b/i-0cb45ac45a166173b running clustername-8qw5l-worker-us-east-1c-pkg26 Running m4.large us-east-1 us-east-1c 3h28m ip-10-0-170-181.ec2.internal aws:///us-east-1c/i-06861c00007751b0a running 1 The new machine, clustername-8qw5l-master-3 is being created and is ready once the phase changes from Provisioning to Running . It might take a few minutes for the new machine to be created. The etcd cluster Operator will automatically sync when the machine or node returns to a healthy state. Note Verify the subnet IDs that you are using for your machine sets to ensure that they end up in the correct availability zone. Turn the quorum guard back on by entering the following command: USD oc patch etcd/cluster --type=merge -p '{"spec": {"unsupportedConfigOverrides": null}}' You can verify that the unsupportedConfigOverrides section is removed from the object by entering this command: USD oc get etcd/cluster -oyaml If you are using single-node OpenShift, restart the node. Otherwise, you might encounter the following error in the etcd cluster Operator: Example output EtcdCertSignerControllerDegraded: [Operation cannot be fulfilled on secrets "etcd-peer-sno-0": the object has been modified; please apply your changes to the latest version and try again, Operation cannot be fulfilled on secrets "etcd-serving-sno-0": the object has been modified; please apply your changes to the latest version and try again, Operation cannot be fulfilled on secrets "etcd-serving-metrics-sno-0": the object has been modified; please apply your changes to the latest version and try again] Verification Verify that all etcd pods are running properly. In a terminal that has access to the cluster as a cluster-admin user, run the following command: USD oc -n openshift-etcd get pods -l k8s-app=etcd Example output etcd-ip-10-0-133-53.ec2.internal 3/3 Running 0 7m49s etcd-ip-10-0-164-97.ec2.internal 3/3 Running 0 123m etcd-ip-10-0-154-204.ec2.internal 3/3 Running 0 124m If the output from the command only lists two pods, you can manually force an etcd redeployment. In a terminal that has access to the cluster as a cluster-admin user, run the following command: USD oc patch etcd cluster -p='{"spec": {"forceRedeploymentReason": "recovery-'"USD( date --rfc-3339=ns )"'"}}' --type=merge 1 1 The forceRedeploymentReason value must be unique, which is why a timestamp is appended. Verify that there are exactly three etcd members. Connect to the running etcd container, passing in the name of a pod that was not on the affected node: In a terminal that has access to the cluster as a cluster-admin user, run the following command: USD oc rsh -n openshift-etcd etcd-ip-10-0-154-204.ec2.internal View the member list: sh-4.2# etcdctl member list -w table Example output +------------------+---------+------------------------------+---------------------------+---------------------------+ | ID | STATUS | NAME | PEER ADDRS | CLIENT ADDRS | +------------------+---------+------------------------------+---------------------------+---------------------------+ | 5eb0d6b8ca24730c | started | ip-10-0-133-53.ec2.internal | https://10.0.133.53:2380 | https://10.0.133.53:2379 | | 757b6793e2408b6c | started | ip-10-0-164-97.ec2.internal | https://10.0.164.97:2380 | https://10.0.164.97:2379 | | ca8c2990a0aa29d1 | started | ip-10-0-154-204.ec2.internal | https://10.0.154.204:2380 | https://10.0.154.204:2379 | +------------------+---------+------------------------------+---------------------------+---------------------------+ If the output from the command lists more than three etcd members, you must carefully remove the unwanted member. Warning Be sure to remove the correct etcd member; removing a good etcd member might lead to quorum loss. Additional resources Recovering a degraded etcd Operator 5.2.4.2. Replacing an unhealthy etcd member whose etcd pod is crashlooping This procedure details the steps to replace an etcd member that is unhealthy because the etcd pod is crashlooping. Prerequisites You have identified the unhealthy etcd member. You have verified that the etcd pod is crashlooping. You have access to the cluster as a user with the cluster-admin role. You have taken an etcd backup. Important It is important to take an etcd backup before performing this procedure so that your cluster can be restored if you encounter any issues. Procedure Stop the crashlooping etcd pod. Debug the node that is crashlooping. In a terminal that has access to the cluster as a cluster-admin user, run the following command: USD oc debug node/ip-10-0-131-183.ec2.internal 1 1 Replace this with the name of the unhealthy node. Change your root directory to /host : sh-4.2# chroot /host Move the existing etcd pod file out of the kubelet manifest directory: sh-4.2# mkdir /var/lib/etcd-backup sh-4.2# mv /etc/kubernetes/manifests/etcd-pod.yaml /var/lib/etcd-backup/ Move the etcd data directory to a different location: sh-4.2# mv /var/lib/etcd/ /tmp You can now exit the node shell. Remove the unhealthy member. Choose a pod that is not on the affected node. In a terminal that has access to the cluster as a cluster-admin user, run the following command: USD oc -n openshift-etcd get pods -l k8s-app=etcd Example output etcd-ip-10-0-131-183.ec2.internal 2/3 Error 7 6h9m etcd-ip-10-0-164-97.ec2.internal 3/3 Running 0 6h6m etcd-ip-10-0-154-204.ec2.internal 3/3 Running 0 6h6m Connect to the running etcd container, passing in the name of a pod that is not on the affected node. In a terminal that has access to the cluster as a cluster-admin user, run the following command: USD oc rsh -n openshift-etcd etcd-ip-10-0-154-204.ec2.internal View the member list: sh-4.2# etcdctl member list -w table Example output +------------------+---------+------------------------------+---------------------------+---------------------------+ | ID | STATUS | NAME | PEER ADDRS | CLIENT ADDRS | +------------------+---------+------------------------------+---------------------------+---------------------------+ | 62bcf33650a7170a | started | ip-10-0-131-183.ec2.internal | https://10.0.131.183:2380 | https://10.0.131.183:2379 | | b78e2856655bc2eb | started | ip-10-0-164-97.ec2.internal | https://10.0.164.97:2380 | https://10.0.164.97:2379 | | d022e10b498760d5 | started | ip-10-0-154-204.ec2.internal | https://10.0.154.204:2380 | https://10.0.154.204:2379 | +------------------+---------+------------------------------+---------------------------+---------------------------+ Take note of the ID and the name of the unhealthy etcd member, because these values are needed later in the procedure. Remove the unhealthy etcd member by providing the ID to the etcdctl member remove command: sh-4.2# etcdctl member remove 62bcf33650a7170a Example output Member 62bcf33650a7170a removed from cluster ead669ce1fbfb346 View the member list again and verify that the member was removed: sh-4.2# etcdctl member list -w table Example output +------------------+---------+------------------------------+---------------------------+---------------------------+ | ID | STATUS | NAME | PEER ADDRS | CLIENT ADDRS | +------------------+---------+------------------------------+---------------------------+---------------------------+ | b78e2856655bc2eb | started | ip-10-0-164-97.ec2.internal | https://10.0.164.97:2380 | https://10.0.164.97:2379 | | d022e10b498760d5 | started | ip-10-0-154-204.ec2.internal | https://10.0.154.204:2380 | https://10.0.154.204:2379 | +------------------+---------+------------------------------+---------------------------+---------------------------+ You can now exit the node shell. Turn off the quorum guard by entering the following command: USD oc patch etcd/cluster --type=merge -p '{"spec": {"unsupportedConfigOverrides": {"useUnsupportedUnsafeNonHANonProductionUnstableEtcd": true}}}' This command ensures that you can successfully re-create secrets and roll out the static pods. Remove the old secrets for the unhealthy etcd member that was removed. List the secrets for the unhealthy etcd member that was removed. USD oc get secrets -n openshift-etcd | grep ip-10-0-131-183.ec2.internal 1 1 Pass in the name of the unhealthy etcd member that you took note of earlier in this procedure. There is a peer, serving, and metrics secret as shown in the following output: Example output etcd-peer-ip-10-0-131-183.ec2.internal kubernetes.io/tls 2 47m etcd-serving-ip-10-0-131-183.ec2.internal kubernetes.io/tls 2 47m etcd-serving-metrics-ip-10-0-131-183.ec2.internal kubernetes.io/tls 2 47m Delete the secrets for the unhealthy etcd member that was removed. Delete the peer secret: USD oc delete secret -n openshift-etcd etcd-peer-ip-10-0-131-183.ec2.internal Delete the serving secret: USD oc delete secret -n openshift-etcd etcd-serving-ip-10-0-131-183.ec2.internal Delete the metrics secret: USD oc delete secret -n openshift-etcd etcd-serving-metrics-ip-10-0-131-183.ec2.internal Force etcd redeployment. In a terminal that has access to the cluster as a cluster-admin user, run the following command: USD oc patch etcd cluster -p='{"spec": {"forceRedeploymentReason": "single-master-recovery-'"USD( date --rfc-3339=ns )"'"}}' --type=merge 1 1 The forceRedeploymentReason value must be unique, which is why a timestamp is appended. When the etcd cluster Operator performs a redeployment, it ensures that all control plane nodes have a functioning etcd pod. Turn the quorum guard back on by entering the following command: USD oc patch etcd/cluster --type=merge -p '{"spec": {"unsupportedConfigOverrides": null}}' You can verify that the unsupportedConfigOverrides section is removed from the object by entering this command: USD oc get etcd/cluster -oyaml If you are using single-node OpenShift, restart the node. Otherwise, you might encounter the following error in the etcd cluster Operator: Example output EtcdCertSignerControllerDegraded: [Operation cannot be fulfilled on secrets "etcd-peer-sno-0": the object has been modified; please apply your changes to the latest version and try again, Operation cannot be fulfilled on secrets "etcd-serving-sno-0": the object has been modified; please apply your changes to the latest version and try again, Operation cannot be fulfilled on secrets "etcd-serving-metrics-sno-0": the object has been modified; please apply your changes to the latest version and try again] Verification Verify that the new member is available and healthy. Connect to the running etcd container again. In a terminal that has access to the cluster as a cluster-admin user, run the following command: USD oc rsh -n openshift-etcd etcd-ip-10-0-154-204.ec2.internal Verify that all members are healthy: sh-4.2# etcdctl endpoint health Example output https://10.0.131.183:2379 is healthy: successfully committed proposal: took = 16.671434ms https://10.0.154.204:2379 is healthy: successfully committed proposal: took = 16.698331ms https://10.0.164.97:2379 is healthy: successfully committed proposal: took = 16.621645ms 5.2.4.3. Replacing an unhealthy bare metal etcd member whose machine is not running or whose node is not ready This procedure details the steps to replace a bare metal etcd member that is unhealthy either because the machine is not running or because the node is not ready. If you are running installer-provisioned infrastructure or you used the Machine API to create your machines, follow these steps. Otherwise you must create the new control plane node using the same method that was used to originally create it. Prerequisites You have identified the unhealthy bare metal etcd member. You have verified that either the machine is not running or the node is not ready. You have access to the cluster as a user with the cluster-admin role. You have taken an etcd backup. Important You must take an etcd backup before performing this procedure so that your cluster can be restored if you encounter any issues. Procedure Verify and remove the unhealthy member. Choose a pod that is not on the affected node: In a terminal that has access to the cluster as a cluster-admin user, run the following command: USD oc -n openshift-etcd get pods -l k8s-app=etcd -o wide Example output etcd-openshift-control-plane-0 5/5 Running 11 3h56m 192.168.10.9 openshift-control-plane-0 <none> <none> etcd-openshift-control-plane-1 5/5 Running 0 3h54m 192.168.10.10 openshift-control-plane-1 <none> <none> etcd-openshift-control-plane-2 5/5 Running 0 3h58m 192.168.10.11 openshift-control-plane-2 <none> <none> Connect to the running etcd container, passing in the name of a pod that is not on the affected node: In a terminal that has access to the cluster as a cluster-admin user, run the following command: USD oc rsh -n openshift-etcd etcd-openshift-control-plane-0 View the member list: sh-4.2# etcdctl member list -w table Example output +------------------+---------+--------------------+---------------------------+---------------------------+---------------------+ | ID | STATUS | NAME | PEER ADDRS | CLIENT ADDRS | IS LEARNER | +------------------+---------+--------------------+---------------------------+---------------------------+---------------------+ | 7a8197040a5126c8 | started | openshift-control-plane-2 | https://192.168.10.11:2380/ | https://192.168.10.11:2379/ | false | | 8d5abe9669a39192 | started | openshift-control-plane-1 | https://192.168.10.10:2380/ | https://192.168.10.10:2379/ | false | | cc3830a72fc357f9 | started | openshift-control-plane-0 | https://192.168.10.9:2380/ | https://192.168.10.9:2379/ | false | +------------------+---------+--------------------+---------------------------+---------------------------+---------------------+ Take note of the ID and the name of the unhealthy etcd member, because these values are required later in the procedure. The etcdctl endpoint health command will list the removed member until the replacement procedure is completed and the new member is added. Remove the unhealthy etcd member by providing the ID to the etcdctl member remove command: Warning Be sure to remove the correct etcd member; removing a good etcd member might lead to quorum loss. sh-4.2# etcdctl member remove 7a8197040a5126c8 Example output Member 7a8197040a5126c8 removed from cluster b23536c33f2cdd1b View the member list again and verify that the member was removed: sh-4.2# etcdctl member list -w table Example output +------------------+---------+--------------------+---------------------------+---------------------------+-------------------------+ | ID | STATUS | NAME | PEER ADDRS | CLIENT ADDRS | IS LEARNER | +------------------+---------+--------------------+---------------------------+---------------------------+-------------------------+ | cc3830a72fc357f9 | started | openshift-control-plane-2 | https://192.168.10.11:2380/ | https://192.168.10.11:2379/ | false | | 8d5abe9669a39192 | started | openshift-control-plane-1 | https://192.168.10.10:2380/ | https://192.168.10.10:2379/ | false | +------------------+---------+--------------------+---------------------------+---------------------------+-------------------------+ You can now exit the node shell. Important After you remove the member, the cluster might be unreachable for a short time while the remaining etcd instances reboot. Turn off the quorum guard by entering the following command: USD oc patch etcd/cluster --type=merge -p '{"spec": {"unsupportedConfigOverrides": {"useUnsupportedUnsafeNonHANonProductionUnstableEtcd": true}}}' This command ensures that you can successfully re-create secrets and roll out the static pods. Remove the old secrets for the unhealthy etcd member that was removed by running the following commands. List the secrets for the unhealthy etcd member that was removed. USD oc get secrets -n openshift-etcd | grep openshift-control-plane-2 Pass in the name of the unhealthy etcd member that you took note of earlier in this procedure. There is a peer, serving, and metrics secret as shown in the following output: etcd-peer-openshift-control-plane-2 kubernetes.io/tls 2 134m etcd-serving-metrics-openshift-control-plane-2 kubernetes.io/tls 2 134m etcd-serving-openshift-control-plane-2 kubernetes.io/tls 2 134m Delete the secrets for the unhealthy etcd member that was removed. Delete the peer secret: USD oc delete secret etcd-peer-openshift-control-plane-2 -n openshift-etcd secret "etcd-peer-openshift-control-plane-2" deleted Delete the serving secret: USD oc delete secret etcd-serving-metrics-openshift-control-plane-2 -n openshift-etcd secret "etcd-serving-metrics-openshift-control-plane-2" deleted Delete the metrics secret: USD oc delete secret etcd-serving-openshift-control-plane-2 -n openshift-etcd secret "etcd-serving-openshift-control-plane-2" deleted Obtain the machine for the unhealthy member. In a terminal that has access to the cluster as a cluster-admin user, run the following command: USD oc get machines -n openshift-machine-api -o wide Example output NAME PHASE TYPE REGION ZONE AGE NODE PROVIDERID STATE examplecluster-control-plane-0 Running 3h11m openshift-control-plane-0 baremetalhost:///openshift-machine-api/openshift-control-plane-0/da1ebe11-3ff2-41c5-b099-0aa41222964e externally provisioned 1 examplecluster-control-plane-1 Running 3h11m openshift-control-plane-1 baremetalhost:///openshift-machine-api/openshift-control-plane-1/d9f9acbc-329c-475e-8d81-03b20280a3e1 externally provisioned examplecluster-control-plane-2 Running 3h11m openshift-control-plane-2 baremetalhost:///openshift-machine-api/openshift-control-plane-2/3354bdac-61d8-410f-be5b-6a395b056135 externally provisioned examplecluster-compute-0 Running 165m openshift-compute-0 baremetalhost:///openshift-machine-api/openshift-compute-0/3d685b81-7410-4bb3-80ec-13a31858241f provisioned examplecluster-compute-1 Running 165m openshift-compute-1 baremetalhost:///openshift-machine-api/openshift-compute-1/0fdae6eb-2066-4241-91dc-e7ea72ab13b9 provisioned 1 This is the control plane machine for the unhealthy node, examplecluster-control-plane-2 . Ensure that the Bare Metal Operator is available by running the following command: USD oc get clusteroperator baremetal Example output NAME VERSION AVAILABLE PROGRESSING DEGRADED SINCE MESSAGE baremetal 4.14.0 True False False 3d15h Remove the old BareMetalHost object by running the following command: USD oc delete bmh openshift-control-plane-2 -n openshift-machine-api Example output baremetalhost.metal3.io "openshift-control-plane-2" deleted Delete the machine of the unhealthy member by running the following command: USD oc delete machine -n openshift-machine-api examplecluster-control-plane-2 After you remove the BareMetalHost and Machine objects, then the Machine controller automatically deletes the Node object. If deletion of the machine is delayed for any reason or the command is obstructed and delayed, you can force deletion by removing the machine object finalizer field. Important Do not interrupt machine deletion by pressing Ctrl+c . You must allow the command to proceed to completion. Open a new terminal window to edit and delete the finalizer fields. A new machine is automatically provisioned after deleting the machine of the unhealthy member. Edit the machine configuration by running the following command: USD oc edit machine -n openshift-machine-api examplecluster-control-plane-2 Delete the following fields in the Machine custom resource, and then save the updated file: finalizers: - machine.machine.openshift.io Example output machine.machine.openshift.io/examplecluster-control-plane-2 edited Verify that the machine was deleted by running the following command: USD oc get machines -n openshift-machine-api -o wide Example output NAME PHASE TYPE REGION ZONE AGE NODE PROVIDERID STATE examplecluster-control-plane-0 Running 3h11m openshift-control-plane-0 baremetalhost:///openshift-machine-api/openshift-control-plane-0/da1ebe11-3ff2-41c5-b099-0aa41222964e externally provisioned examplecluster-control-plane-1 Running 3h11m openshift-control-plane-1 baremetalhost:///openshift-machine-api/openshift-control-plane-1/d9f9acbc-329c-475e-8d81-03b20280a3e1 externally provisioned examplecluster-compute-0 Running 165m openshift-compute-0 baremetalhost:///openshift-machine-api/openshift-compute-0/3d685b81-7410-4bb3-80ec-13a31858241f provisioned examplecluster-compute-1 Running 165m openshift-compute-1 baremetalhost:///openshift-machine-api/openshift-compute-1/0fdae6eb-2066-4241-91dc-e7ea72ab13b9 provisioned Verify that the node has been deleted by running the following command: USD oc get nodes NAME STATUS ROLES AGE VERSION openshift-control-plane-0 Ready master 3h24m v1.27.3 openshift-control-plane-1 Ready master 3h24m v1.27.3 openshift-compute-0 Ready worker 176m v1.27.3 openshift-compute-1 Ready worker 176m v1.27.3 Create the new BareMetalHost object and the secret to store the BMC credentials: USD cat <<EOF | oc apply -f - apiVersion: v1 kind: Secret metadata: name: openshift-control-plane-2-bmc-secret namespace: openshift-machine-api data: password: <password> username: <username> type: Opaque --- apiVersion: metal3.io/v1alpha1 kind: BareMetalHost metadata: name: openshift-control-plane-2 namespace: openshift-machine-api spec: automatedCleaningMode: disabled bmc: address: redfish://10.46.61.18:443/redfish/v1/Systems/1 credentialsName: openshift-control-plane-2-bmc-secret disableCertificateVerification: true bootMACAddress: 48:df:37:b0:8a:a0 bootMode: UEFI externallyProvisioned: false online: true rootDeviceHints: deviceName: /dev/disk/by-id/scsi-<serial_number> userData: name: master-user-data-managed namespace: openshift-machine-api EOF Note The username and password can be found from the other bare metal host's secrets. The protocol to use in bmc:address can be taken from other bmh objects. Important If you reuse the BareMetalHost object definition from an existing control plane host, do not leave the externallyProvisioned field set to true . Existing control plane BareMetalHost objects may have the externallyProvisioned flag set to true if they were provisioned by the OpenShift Container Platform installation program. After the inspection is complete, the BareMetalHost object is created and available to be provisioned. Verify the creation process using available BareMetalHost objects: USD oc get bmh -n openshift-machine-api NAME STATE CONSUMER ONLINE ERROR AGE openshift-control-plane-0 externally provisioned examplecluster-control-plane-0 true 4h48m openshift-control-plane-1 externally provisioned examplecluster-control-plane-1 true 4h48m openshift-control-plane-2 available examplecluster-control-plane-3 true 47m openshift-compute-0 provisioned examplecluster-compute-0 true 4h48m openshift-compute-1 provisioned examplecluster-compute-1 true 4h48m Verify that a new machine has been created: USD oc get machines -n openshift-machine-api -o wide Example output NAME PHASE TYPE REGION ZONE AGE NODE PROVIDERID STATE examplecluster-control-plane-0 Running 3h11m openshift-control-plane-0 baremetalhost:///openshift-machine-api/openshift-control-plane-0/da1ebe11-3ff2-41c5-b099-0aa41222964e externally provisioned 1 examplecluster-control-plane-1 Running 3h11m openshift-control-plane-1 baremetalhost:///openshift-machine-api/openshift-control-plane-1/d9f9acbc-329c-475e-8d81-03b20280a3e1 externally provisioned examplecluster-control-plane-2 Running 3h11m openshift-control-plane-2 baremetalhost:///openshift-machine-api/openshift-control-plane-2/3354bdac-61d8-410f-be5b-6a395b056135 externally provisioned examplecluster-compute-0 Running 165m openshift-compute-0 baremetalhost:///openshift-machine-api/openshift-compute-0/3d685b81-7410-4bb3-80ec-13a31858241f provisioned examplecluster-compute-1 Running 165m openshift-compute-1 baremetalhost:///openshift-machine-api/openshift-compute-1/0fdae6eb-2066-4241-91dc-e7ea72ab13b9 provisioned 1 The new machine, clustername-8qw5l-master-3 is being created and is ready after the phase changes from Provisioning to Running . It should take a few minutes for the new machine to be created. The etcd cluster Operator will automatically sync when the machine or node returns to a healthy state. Verify that the bare metal host becomes provisioned and no error reported by running the following command: USD oc get bmh -n openshift-machine-api Example output USD oc get bmh -n openshift-machine-api NAME STATE CONSUMER ONLINE ERROR AGE openshift-control-plane-0 externally provisioned examplecluster-control-plane-0 true 4h48m openshift-control-plane-1 externally provisioned examplecluster-control-plane-1 true 4h48m openshift-control-plane-2 provisioned examplecluster-control-plane-3 true 47m openshift-compute-0 provisioned examplecluster-compute-0 true 4h48m openshift-compute-1 provisioned examplecluster-compute-1 true 4h48m Verify that the new node is added and in a ready state by running this command: USD oc get nodes Example output USD oc get nodes NAME STATUS ROLES AGE VERSION openshift-control-plane-0 Ready master 4h26m v1.27.3 openshift-control-plane-1 Ready master 4h26m v1.27.3 openshift-control-plane-2 Ready master 12m v1.27.3 openshift-compute-0 Ready worker 3h58m v1.27.3 openshift-compute-1 Ready worker 3h58m v1.27.3 Turn the quorum guard back on by entering the following command: USD oc patch etcd/cluster --type=merge -p '{"spec": {"unsupportedConfigOverrides": null}}' You can verify that the unsupportedConfigOverrides section is removed from the object by entering this command: USD oc get etcd/cluster -oyaml If you are using single-node OpenShift, restart the node. Otherwise, you might encounter the following error in the etcd cluster Operator: Example output EtcdCertSignerControllerDegraded: [Operation cannot be fulfilled on secrets "etcd-peer-sno-0": the object has been modified; please apply your changes to the latest version and try again, Operation cannot be fulfilled on secrets "etcd-serving-sno-0": the object has been modified; please apply your changes to the latest version and try again, Operation cannot be fulfilled on secrets "etcd-serving-metrics-sno-0": the object has been modified; please apply your changes to the latest version and try again] Verification Verify that all etcd pods are running properly. In a terminal that has access to the cluster as a cluster-admin user, run the following command: USD oc -n openshift-etcd get pods -l k8s-app=etcd Example output etcd-openshift-control-plane-0 5/5 Running 0 105m etcd-openshift-control-plane-1 5/5 Running 0 107m etcd-openshift-control-plane-2 5/5 Running 0 103m If the output from the command only lists two pods, you can manually force an etcd redeployment. In a terminal that has access to the cluster as a cluster-admin user, run the following command: USD oc patch etcd cluster -p='{"spec": {"forceRedeploymentReason": "recovery-'"USD( date --rfc-3339=ns )"'"}}' --type=merge 1 1 The forceRedeploymentReason value must be unique, which is why a timestamp is appended. To verify there are exactly three etcd members, connect to the running etcd container, passing in the name of a pod that was not on the affected node. In a terminal that has access to the cluster as a cluster-admin user, run the following command: USD oc rsh -n openshift-etcd etcd-openshift-control-plane-0 View the member list: sh-4.2# etcdctl member list -w table Example output +------------------+---------+--------------------+---------------------------+---------------------------+-----------------+ | ID | STATUS | NAME | PEER ADDRS | CLIENT ADDRS | IS LEARNER | +------------------+---------+--------------------+---------------------------+---------------------------+-----------------+ | 7a8197040a5126c8 | started | openshift-control-plane-2 | https://192.168.10.11:2380 | https://192.168.10.11:2379 | false | | 8d5abe9669a39192 | started | openshift-control-plane-1 | https://192.168.10.10:2380 | https://192.168.10.10:2379 | false | | cc3830a72fc357f9 | started | openshift-control-plane-0 | https://192.168.10.9:2380 | https://192.168.10.9:2379 | false | +------------------+---------+--------------------+---------------------------+---------------------------+-----------------+ Note If the output from the command lists more than three etcd members, you must carefully remove the unwanted member. Verify that all etcd members are healthy by running the following command: # etcdctl endpoint health --cluster Example output https://192.168.10.10:2379 is healthy: successfully committed proposal: took = 8.973065ms https://192.168.10.9:2379 is healthy: successfully committed proposal: took = 11.559829ms https://192.168.10.11:2379 is healthy: successfully committed proposal: took = 11.665203ms Validate that all nodes are at the latest revision by running the following command: USD oc get etcd -o=jsonpath='{range.items[0].status.conditions[?(@.type=="NodeInstallerProgressing")]}{.reason}{"\n"}{.message}{"\n"}' 5.2.5. Additional resources Quorum protection with machine lifecycle hooks 5.3. Disaster recovery 5.3.1. About disaster recovery The disaster recovery documentation provides information for administrators on how to recover from several disaster situations that might occur with their OpenShift Container Platform cluster. As an administrator, you might need to follow one or more of the following procedures to return your cluster to a working state. Important Disaster recovery requires you to have at least one healthy control plane host. Restoring to a cluster state This solution handles situations where you want to restore your cluster to a state, for example, if an administrator deletes something critical. This also includes situations where you have lost the majority of your control plane hosts, leading to etcd quorum loss and the cluster going offline. As long as you have taken an etcd backup, you can follow this procedure to restore your cluster to a state. If applicable, you might also need to recover from expired control plane certificates . Warning Restoring to a cluster state is a destructive and destablizing action to take on a running cluster. This procedure should only be used as a last resort. Prior to performing a restore, see About restoring cluster state for more information on the impact to the cluster. Note If you have a majority of your masters still available and have an etcd quorum, then follow the procedure to replace a single unhealthy etcd member . Recovering from expired control plane certificates This solution handles situations where your control plane certificates have expired. For example, if you shut down your cluster before the first certificate rotation, which occurs 24 hours after installation, your certificates will not be rotated and will expire. You can follow this procedure to recover from expired control plane certificates. 5.3.2. Restoring to a cluster state To restore the cluster to a state, you must have previously backed up etcd data by creating a snapshot. You will use this snapshot to restore the cluster state. 5.3.2.1. About restoring cluster state You can use an etcd backup to restore your cluster to a state. This can be used to recover from the following situations: The cluster has lost the majority of control plane hosts (quorum loss). An administrator has deleted something critical and must restore to recover the cluster. Warning Restoring to a cluster state is a destructive and destablizing action to take on a running cluster. This should only be used as a last resort. If you are able to retrieve data using the Kubernetes API server, then etcd is available and you should not restore using an etcd backup. Restoring etcd effectively takes a cluster back in time and all clients will experience a conflicting, parallel history. This can impact the behavior of watching components like kubelets, Kubernetes controller managers, SDN controllers, and persistent volume controllers. It can cause Operator churn when the content in etcd does not match the actual content on disk, causing Operators for the Kubernetes API server, Kubernetes controller manager, Kubernetes scheduler, and etcd to get stuck when files on disk conflict with content in etcd. This can require manual actions to resolve the issues. In extreme cases, the cluster can lose track of persistent volumes, delete critical workloads that no longer exist, reimage machines, and rewrite CA bundles with expired certificates. 5.3.2.2. Restoring to a cluster state You can use a saved etcd backup to restore a cluster state or restore a cluster that has lost the majority of control plane hosts. Note If your cluster uses a control plane machine set, see "Troubleshooting the control plane machine set" for a more simple etcd recovery procedure. Important When you restore your cluster, you must use an etcd backup that was taken from the same z-stream release. For example, an OpenShift Container Platform 4.7.2 cluster must use an etcd backup that was taken from 4.7.2. Prerequisites Access to the cluster as a user with the cluster-admin role through a certificate-based kubeconfig file, like the one that was used during installation. A healthy control plane host to use as the recovery host. SSH access to control plane hosts. A backup directory containing both the etcd snapshot and the resources for the static pods, which were from the same backup. The file names in the directory must be in the following formats: snapshot_<datetimestamp>.db and static_kuberesources_<datetimestamp>.tar.gz . Important For non-recovery control plane nodes, it is not required to establish SSH connectivity or to stop the static pods. You can delete and recreate other non-recovery, control plane machines, one by one. Procedure Select a control plane host to use as the recovery host. This is the host that you will run the restore operation on. Establish SSH connectivity to each of the control plane nodes, including the recovery host. kube-apiserver becomes inaccessible after the restore process starts, so you cannot access the control plane nodes. For this reason, it is recommended to establish SSH connectivity to each control plane host in a separate terminal. Important If you do not complete this step, you will not be able to access the control plane hosts to complete the restore procedure, and you will be unable to recover your cluster from this state. Copy the etcd backup directory to the recovery control plane host. This procedure assumes that you copied the backup directory containing the etcd snapshot and the resources for the static pods to the /home/core/ directory of your recovery control plane host. Stop the static pods on any other control plane nodes. Note You do not need to stop the static pods on the recovery host. Access a control plane host that is not the recovery host. Move the existing etcd pod file out of the kubelet manifest directory by running: USD sudo mv -v /etc/kubernetes/manifests/etcd-pod.yaml /tmp Verify that the etcd pods are stopped by using: USD sudo crictl ps | grep etcd | egrep -v "operator|etcd-guard" If the output of this command is not empty, wait a few minutes and check again. Move the existing kube-apiserver file out of the kubelet manifest directory by running: USD sudo mv -v /etc/kubernetes/manifests/kube-apiserver-pod.yaml /tmp Verify that the kube-apiserver containers are stopped by running: USD sudo crictl ps | grep kube-apiserver | egrep -v "operator|guard" If the output of this command is not empty, wait a few minutes and check again. Move the existing kube-controller-manager file out of the kubelet manifest directory by using: USD sudo mv -v /etc/kubernetes/manifests/kube-controller-manager-pod.yaml /tmp Verify that the kube-controller-manager containers are stopped by running: USD sudo crictl ps | grep kube-controller-manager | egrep -v "operator|guard" If the output of this command is not empty, wait a few minutes and check again. Move the existing kube-scheduler file out of the kubelet manifest directory by using: USD sudo mv -v /etc/kubernetes/manifests/kube-scheduler-pod.yaml /tmp Verify that the kube-scheduler containers are stopped by using: USD sudo crictl ps | grep kube-scheduler | egrep -v "operator|guard" If the output of this command is not empty, wait a few minutes and check again. Move the etcd data directory to a different location with the following example: USD sudo mv -v /var/lib/etcd/ /tmp If the /etc/kubernetes/manifests/keepalived.yaml file exists and the node is deleted, follow these steps: Move the /etc/kubernetes/manifests/keepalived.yaml file out of the kubelet manifest directory: USD sudo mv -v /etc/kubernetes/manifests/keepalived.yaml /tmp Verify that any containers managed by the keepalived daemon are stopped: USD sudo crictl ps --name keepalived The output of this command should be empty. If it is not empty, wait a few minutes and check again. Check if the control plane has any Virtual IPs (VIPs) assigned to it: USD ip -o address | egrep '<api_vip>|<ingress_vip>' For each reported VIP, run the following command to remove it: USD sudo ip address del <reported_vip> dev <reported_vip_device> Repeat this step on each of the other control plane hosts that is not the recovery host. Access the recovery control plane host. If the keepalived daemon is in use, verify that the recovery control plane node owns the VIP: USD ip -o address | grep <api_vip> The address of the VIP is highlighted in the output if it exists. This command returns an empty string if the VIP is not set or configured incorrectly. If the cluster-wide proxy is enabled, be sure that you have exported the NO_PROXY , HTTP_PROXY , and HTTPS_PROXY environment variables. Tip You can check whether the proxy is enabled by reviewing the output of oc get proxy cluster -o yaml . The proxy is enabled if the httpProxy , httpsProxy , and noProxy fields have values set. Run the restore script on the recovery control plane host and pass in the path to the etcd backup directory: USD sudo -E /usr/local/bin/cluster-restore.sh /home/core/assets/backup Example script output ...stopping kube-scheduler-pod.yaml ...stopping kube-controller-manager-pod.yaml ...stopping etcd-pod.yaml ...stopping kube-apiserver-pod.yaml Waiting for container etcd to stop .complete Waiting for container etcdctl to stop .............................complete Waiting for container etcd-metrics to stop complete Waiting for container kube-controller-manager to stop complete Waiting for container kube-apiserver to stop ..........................................................................................complete Waiting for container kube-scheduler to stop complete Moving etcd data-dir /var/lib/etcd/member to /var/lib/etcd-backup starting restore-etcd static pod starting kube-apiserver-pod.yaml static-pod-resources/kube-apiserver-pod-7/kube-apiserver-pod.yaml starting kube-controller-manager-pod.yaml static-pod-resources/kube-controller-manager-pod-7/kube-controller-manager-pod.yaml starting kube-scheduler-pod.yaml static-pod-resources/kube-scheduler-pod-8/kube-scheduler-pod.yaml The cluster-restore.sh script must show that etcd , kube-apiserver , kube-controller-manager , and kube-scheduler pods are stopped and then started at the end of the restore process. Note The restore process can cause nodes to enter the NotReady state if the node certificates were updated after the last etcd backup. Check the nodes to ensure they are in the Ready state. Run the following command: USD oc get nodes -w Sample output NAME STATUS ROLES AGE VERSION host-172-25-75-28 Ready master 3d20h v1.27.3 host-172-25-75-38 Ready infra,worker 3d20h v1.27.3 host-172-25-75-40 Ready master 3d20h v1.27.3 host-172-25-75-65 Ready master 3d20h v1.27.3 host-172-25-75-74 Ready infra,worker 3d20h v1.27.3 host-172-25-75-79 Ready worker 3d20h v1.27.3 host-172-25-75-86 Ready worker 3d20h v1.27.3 host-172-25-75-98 Ready infra,worker 3d20h v1.27.3 It can take several minutes for all nodes to report their state. If any nodes are in the NotReady state, log in to the nodes and remove all of the PEM files from the /var/lib/kubelet/pki directory on each node. You can SSH into the nodes or use the terminal window in the web console. USD ssh -i <ssh-key-path> core@<master-hostname> Sample pki directory sh-4.4# pwd /var/lib/kubelet/pki sh-4.4# ls kubelet-client-2022-04-28-11-24-09.pem kubelet-server-2022-04-28-11-24-15.pem kubelet-client-current.pem kubelet-server-current.pem Restart the kubelet service on all control plane hosts. From the recovery host, run: USD sudo systemctl restart kubelet.service Repeat this step on all other control plane hosts. Approve the pending Certificate Signing Requests (CSRs): Note Clusters with no worker nodes, such as single-node clusters or clusters consisting of three schedulable control plane nodes, will not have any pending CSRs to approve. You can skip all the commands listed in this step. Get the list of current CSRs by running: USD oc get csr Example output 1 2 A pending kubelet serving CSR, requested by the node for the kubelet serving endpoint. 3 4 A pending kubelet client CSR, requested with the node-bootstrapper node bootstrap credentials. Review the details of a CSR to verify that it is valid by running: USD oc describe csr <csr_name> 1 1 <csr_name> is the name of a CSR from the list of current CSRs. Approve each valid node-bootstrapper CSR by running: USD oc adm certificate approve <csr_name> For user-provisioned installations, approve each valid kubelet service CSR by running: USD oc adm certificate approve <csr_name> Verify that the single member control plane has started successfully. From the recovery host, verify that the etcd container is running by using: USD sudo crictl ps | grep etcd | egrep -v "operator|etcd-guard" Example output 3ad41b7908e32 36f86e2eeaaffe662df0d21041eb22b8198e0e58abeeae8c743c3e6e977e8009 About a minute ago Running etcd 0 7c05f8af362f0 From the recovery host, verify that the etcd pod is running by using: USD oc -n openshift-etcd get pods -l k8s-app=etcd Example output NAME READY STATUS RESTARTS AGE etcd-ip-10-0-143-125.ec2.internal 1/1 Running 1 2m47s If the status is Pending , or the output lists more than one running etcd pod, wait a few minutes and check again. If you are using the OVNKubernetes network plugin, you must restart ovnkube-controlplane pods. Delete all of the ovnkube-controlplane pods by running: USD oc -n openshift-ovn-kubernetes delete pod -l app=ovnkube-control-plane Verify that all of the ovnkube-controlplane pods were redeployed by using: USD oc -n openshift-ovn-kubernetes get pod -l app=ovnkube-control-plane If you are using the OVN-Kubernetes network plugin, restart the Open Virtual Network (OVN) Kubernetes pods on all the nodes one by one. Use the following steps to restart OVN-Kubernetes pods on each node: Important Restart OVN-Kubernetes pods in the following order: The recovery control plane host The other control plane hosts (if available) The other nodes Note Validating and mutating admission webhooks can reject pods. If you add any additional webhooks with the failurePolicy set to Fail , then they can reject pods and the restoration process can fail. You can avoid this by saving and deleting webhooks while restoring the cluster state. After the cluster state is restored successfully, you can enable the webhooks again. Alternatively, you can temporarily set the failurePolicy to Ignore while restoring the cluster state. After the cluster state is restored successfully, you can set the failurePolicy to Fail . Remove the northbound database (nbdb) and southbound database (sbdb). Access the recovery host and the remaining control plane nodes by using Secure Shell (SSH) and run: USD sudo rm -f /var/lib/ovn-ic/etc/*.db Restart the OpenVSwitch services. Access the node by using Secure Shell (SSH) and run the following command: USD sudo systemctl restart ovs-vswitchd ovsdb-server Delete the ovnkube-node pod on the node by running the following command, replacing <node> with the name of the node that you are restarting: USD oc -n openshift-ovn-kubernetes delete pod -l app=ovnkube-node --field-selector=spec.nodeName==<node> Check the status of the OVN pods by running the following command: USD oc get po -n openshift-ovn-kubernetes If any OVN pods are in the Terminating status, delete the node that is running that OVN pod by running the following command. Replace <node> with the name of the node you are deleting: USD oc delete node <node> Use SSH to log in to the OVN pod node with the Terminating status by running the following command: USD ssh -i <ssh-key-path> core@<node> Move all PEM files from the /var/lib/kubelet/pki directory by running the following command: USD sudo mv /var/lib/kubelet/pki/* /tmp Restart the kubelet service by running the following command: USD sudo systemctl restart kubelet.service Return to the recovery etcd machines by running the following command: USD oc get csr Example output NAME AGE SIGNERNAME REQUESTOR CONDITION csr-<uuid> 8m3s kubernetes.io/kubelet-serving system:node:<node_name> Pending Approve all new CSRs by running the following command, replacing csr-<uuid> with the name of the CSR: oc adm certificate approve csr-<uuid> Verify that the node is back by running the following command: USD oc get nodes Verify that the ovnkube-node pod is running again with: USD oc -n openshift-ovn-kubernetes get pod -l app=ovnkube-node --field-selector=spec.nodeName==<node> Note It might take several minutes for the pods to restart. Delete and re-create other non-recovery, control plane machines, one by one. After the machines are re-created, a new revision is forced and etcd automatically scales up. If you use a user-provisioned bare metal installation, you can re-create a control plane machine by using the same method that you used to originally create it. For more information, see "Installing a user-provisioned cluster on bare metal". Warning Do not delete and re-create the machine for the recovery host. If you are running installer-provisioned infrastructure, or you used the Machine API to create your machines, follow these steps: Warning Do not delete and re-create the machine for the recovery host. For bare metal installations on installer-provisioned infrastructure, control plane machines are not re-created. For more information, see "Replacing a bare-metal control plane node". Obtain the machine for one of the lost control plane hosts. In a terminal that has access to the cluster as a cluster-admin user, run the following command: USD oc get machines -n openshift-machine-api -o wide Example output: NAME PHASE TYPE REGION ZONE AGE NODE PROVIDERID STATE clustername-8qw5l-master-0 Running m4.xlarge us-east-1 us-east-1a 3h37m ip-10-0-131-183.ec2.internal aws:///us-east-1a/i-0ec2782f8287dfb7e stopped 1 clustername-8qw5l-master-1 Running m4.xlarge us-east-1 us-east-1b 3h37m ip-10-0-143-125.ec2.internal aws:///us-east-1b/i-096c349b700a19631 running clustername-8qw5l-master-2 Running m4.xlarge us-east-1 us-east-1c 3h37m ip-10-0-154-194.ec2.internal aws:///us-east-1c/i-02626f1dba9ed5bba running clustername-8qw5l-worker-us-east-1a-wbtgd Running m4.large us-east-1 us-east-1a 3h28m ip-10-0-129-226.ec2.internal aws:///us-east-1a/i-010ef6279b4662ced running clustername-8qw5l-worker-us-east-1b-lrdxb Running m4.large us-east-1 us-east-1b 3h28m ip-10-0-144-248.ec2.internal aws:///us-east-1b/i-0cb45ac45a166173b running clustername-8qw5l-worker-us-east-1c-pkg26 Running m4.large us-east-1 us-east-1c 3h28m ip-10-0-170-181.ec2.internal aws:///us-east-1c/i-06861c00007751b0a running 1 This is the control plane machine for the lost control plane host, ip-10-0-131-183.ec2.internal . Delete the machine of the lost control plane host by running: USD oc delete machine -n openshift-machine-api clustername-8qw5l-master-0 1 1 Specify the name of the control plane machine for the lost control plane host. A new machine is automatically provisioned after deleting the machine of the lost control plane host. Verify that a new machine has been created by running: USD oc get machines -n openshift-machine-api -o wide Example output: NAME PHASE TYPE REGION ZONE AGE NODE PROVIDERID STATE clustername-8qw5l-master-1 Running m4.xlarge us-east-1 us-east-1b 3h37m ip-10-0-143-125.ec2.internal aws:///us-east-1b/i-096c349b700a19631 running clustername-8qw5l-master-2 Running m4.xlarge us-east-1 us-east-1c 3h37m ip-10-0-154-194.ec2.internal aws:///us-east-1c/i-02626f1dba9ed5bba running clustername-8qw5l-master-3 Provisioning m4.xlarge us-east-1 us-east-1a 85s ip-10-0-173-171.ec2.internal aws:///us-east-1a/i-015b0888fe17bc2c8 running 1 clustername-8qw5l-worker-us-east-1a-wbtgd Running m4.large us-east-1 us-east-1a 3h28m ip-10-0-129-226.ec2.internal aws:///us-east-1a/i-010ef6279b4662ced running clustername-8qw5l-worker-us-east-1b-lrdxb Running m4.large us-east-1 us-east-1b 3h28m ip-10-0-144-248.ec2.internal aws:///us-east-1b/i-0cb45ac45a166173b running clustername-8qw5l-worker-us-east-1c-pkg26 Running m4.large us-east-1 us-east-1c 3h28m ip-10-0-170-181.ec2.internal aws:///us-east-1c/i-06861c00007751b0a running 1 The new machine, clustername-8qw5l-master-3 is being created and is ready after the phase changes from Provisioning to Running . It might take a few minutes for the new machine to be created. The etcd cluster Operator will automatically sync when the machine or node returns to a healthy state. Repeat these steps for each lost control plane host that is not the recovery host. Turn off the quorum guard by entering: USD oc patch etcd/cluster --type=merge -p '{"spec": {"unsupportedConfigOverrides": {"useUnsupportedUnsafeNonHANonProductionUnstableEtcd": true}}}' This command ensures that you can successfully re-create secrets and roll out the static pods. In a separate terminal window within the recovery host, export the recovery kubeconfig file by running: USD export KUBECONFIG=/etc/kubernetes/static-pod-resources/kube-apiserver-certs/secrets/node-kubeconfigs/localhost-recovery.kubeconfig Force etcd redeployment. In the same terminal window where you exported the recovery kubeconfig file, run: USD oc patch etcd cluster -p='{"spec": {"forceRedeploymentReason": "recovery-'"USD( date --rfc-3339=ns )"'"}}' --type=merge 1 1 The forceRedeploymentReason value must be unique, which is why a timestamp is appended. When the etcd cluster Operator performs a redeployment, the existing nodes are started with new pods similar to the initial bootstrap scale up. Turn the quorum guard back on by entering: USD oc patch etcd/cluster --type=merge -p '{"spec": {"unsupportedConfigOverrides": null}}' You can verify that the unsupportedConfigOverrides section is removed from the object by running: USD oc get etcd/cluster -oyaml Verify all nodes are updated to the latest revision. In a terminal that has access to the cluster as a cluster-admin user, run: USD oc get etcd -o=jsonpath='{range .items[0].status.conditions[?(@.type=="NodeInstallerProgressing")]}{.reason}{"\n"}{.message}{"\n"}' Review the NodeInstallerProgressing status condition for etcd to verify that all nodes are at the latest revision. The output shows AllNodesAtLatestRevision upon successful update: AllNodesAtLatestRevision 3 nodes are at revision 7 1 1 In this example, the latest revision number is 7 . If the output includes multiple revision numbers, such as 2 nodes are at revision 6; 1 nodes are at revision 7 , this means that the update is still in progress. Wait a few minutes and try again. After etcd is redeployed, force new rollouts for the control plane. kube-apiserver will reinstall itself on the other nodes because the kubelet is connected to API servers using an internal load balancer. In a terminal that has access to the cluster as a cluster-admin user, run: Force a new rollout for kube-apiserver : USD oc patch kubeapiserver cluster -p='{"spec": {"forceRedeploymentReason": "recovery-'"USD( date --rfc-3339=ns )"'"}}' --type=merge Verify all nodes are updated to the latest revision. USD oc get kubeapiserver -o=jsonpath='{range .items[0].status.conditions[?(@.type=="NodeInstallerProgressing")]}{.reason}{"\n"}{.message}{"\n"}' Review the NodeInstallerProgressing status condition to verify that all nodes are at the latest revision. The output shows AllNodesAtLatestRevision upon successful update: AllNodesAtLatestRevision 3 nodes are at revision 7 1 1 In this example, the latest revision number is 7 . If the output includes multiple revision numbers, such as 2 nodes are at revision 6; 1 nodes are at revision 7 , this means that the update is still in progress. Wait a few minutes and try again. Force a new rollout for the Kubernetes controller manager by running the following command: USD oc patch kubecontrollermanager cluster -p='{"spec": {"forceRedeploymentReason": "recovery-'"USD( date --rfc-3339=ns )"'"}}' --type=merge Verify all nodes are updated to the latest revision by running: USD oc get kubecontrollermanager -o=jsonpath='{range .items[0].status.conditions[?(@.type=="NodeInstallerProgressing")]}{.reason}{"\n"}{.message}{"\n"}' Review the NodeInstallerProgressing status condition to verify that all nodes are at the latest revision. The output shows AllNodesAtLatestRevision upon successful update: AllNodesAtLatestRevision 3 nodes are at revision 7 1 1 In this example, the latest revision number is 7 . If the output includes multiple revision numbers, such as 2 nodes are at revision 6; 1 nodes are at revision 7 , this means that the update is still in progress. Wait a few minutes and try again. Force a new rollout for the kube-scheduler by running: USD oc patch kubescheduler cluster -p='{"spec": {"forceRedeploymentReason": "recovery-'"USD( date --rfc-3339=ns )"'"}}' --type=merge Verify all nodes are updated to the latest revision by using: USD oc get kubescheduler -o=jsonpath='{range .items[0].status.conditions[?(@.type=="NodeInstallerProgressing")]}{.reason}{"\n"}{.message}{"\n"}' Review the NodeInstallerProgressing status condition to verify that all nodes are at the latest revision. The output shows AllNodesAtLatestRevision upon successful update: AllNodesAtLatestRevision 3 nodes are at revision 7 1 1 In this example, the latest revision number is 7 . If the output includes multiple revision numbers, such as 2 nodes are at revision 6; 1 nodes are at revision 7 , this means that the update is still in progress. Wait a few minutes and try again. Verify that all control plane hosts have started and joined the cluster. In a terminal that has access to the cluster as a cluster-admin user, run the following command: USD oc -n openshift-etcd get pods -l k8s-app=etcd Example output etcd-ip-10-0-143-125.ec2.internal 2/2 Running 0 9h etcd-ip-10-0-154-194.ec2.internal 2/2 Running 0 9h etcd-ip-10-0-173-171.ec2.internal 2/2 Running 0 9h To ensure that all workloads return to normal operation following a recovery procedure, restart all control plane nodes. Note On completion of the procedural steps, you might need to wait a few minutes for all services to return to their restored state. For example, authentication by using oc login might not immediately work until the OAuth server pods are restarted. Consider using the system:admin kubeconfig file for immediate authentication. This method basis its authentication on SSL/TLS client certificates as against OAuth tokens. You can authenticate with this file by issuing the following command: USD export KUBECONFIG=<installation_directory>/auth/kubeconfig Issue the following command to display your authenticated user name: USD oc whoami 5.3.2.3. Additional resources Installing a user-provisioned cluster on bare metal Creating a bastion host to access OpenShift Container Platform instances and the control plane nodes with SSH Replacing a bare-metal control plane node 5.3.2.4. Issues and workarounds for restoring a persistent storage state If your OpenShift Container Platform cluster uses persistent storage of any form, a state of the cluster is typically stored outside etcd. It might be an Elasticsearch cluster running in a pod or a database running in a StatefulSet object. When you restore from an etcd backup, the status of the workloads in OpenShift Container Platform is also restored. However, if the etcd snapshot is old, the status might be invalid or outdated. Important The contents of persistent volumes (PVs) are never part of the etcd snapshot. When you restore an OpenShift Container Platform cluster from an etcd snapshot, non-critical workloads might gain access to critical data, or vice-versa. The following are some example scenarios that produce an out-of-date status: MySQL database is running in a pod backed up by a PV object. Restoring OpenShift Container Platform from an etcd snapshot does not bring back the volume on the storage provider, and does not produce a running MySQL pod, despite the pod repeatedly attempting to start. You must manually restore this pod by restoring the volume on the storage provider, and then editing the PV to point to the new volume. Pod P1 is using volume A, which is attached to node X. If the etcd snapshot is taken while another pod uses the same volume on node Y, then when the etcd restore is performed, pod P1 might not be able to start correctly due to the volume still being attached to node Y. OpenShift Container Platform is not aware of the attachment, and does not automatically detach it. When this occurs, the volume must be manually detached from node Y so that the volume can attach on node X, and then pod P1 can start. Cloud provider or storage provider credentials were updated after the etcd snapshot was taken. This causes any CSI drivers or Operators that depend on the those credentials to not work. You might have to manually update the credentials required by those drivers or Operators. A device is removed or renamed from OpenShift Container Platform nodes after the etcd snapshot is taken. The Local Storage Operator creates symlinks for each PV that it manages from /dev/disk/by-id or /dev directories. This situation might cause the local PVs to refer to devices that no longer exist. To fix this problem, an administrator must: Manually remove the PVs with invalid devices. Remove symlinks from respective nodes. Delete LocalVolume or LocalVolumeSet objects (see Storage Configuring persistent storage Persistent storage using local volumes Deleting the Local Storage Operator Resources ). 5.3.3. Recovering from expired control plane certificates 5.3.3.1. Recovering from expired control plane certificates The cluster can automatically recover from expired control plane certificates. However, you must manually approve the pending node-bootstrapper certificate signing requests (CSRs) to recover kubelet certificates. For user-provisioned installations, you might also need to approve pending kubelet serving CSRs. Use the following steps to approve the pending CSRs: Procedure Get the list of current CSRs: USD oc get csr Example output 1 A pending kubelet service CSR (for user-provisioned installations). 2 A pending node-bootstrapper CSR. Review the details of a CSR to verify that it is valid: USD oc describe csr <csr_name> 1 1 <csr_name> is the name of a CSR from the list of current CSRs. Approve each valid node-bootstrapper CSR: USD oc adm certificate approve <csr_name> For user-provisioned installations, approve each valid kubelet serving CSR: USD oc adm certificate approve <csr_name>

Commands:
oc debug --as-root node/<node_name>
sh-4.4# chroot /host
export HTTP_PROXY=http://<your_proxy.example.com>:8080
export HTTPS_PROXY=https://<your_proxy.example.com>:8080
export NO_PROXY=<example.com>
sh-4.4# /usr/local/bin/cluster-backup.sh /home/core/assets/backup
found latest kube-apiserver: /etc/kubernetes/static-pod-resources/kube-apiserver-pod-6 found latest kube-controller-manager: /etc/kubernetes/static-pod-resources/kube-controller-manager-pod-7 found latest kube-scheduler: /etc/kubernetes/static-pod-resources/kube-scheduler-pod-6 found latest etcd: /etc/kubernetes/static-pod-resources/etcd-pod-3 ede95fe6b88b87ba86a03c15e669fb4aa5bf0991c180d3c6895ce72eaade54a1 etcdctl version: 3.4.14 API version: 3.4 {"level":"info","ts":1624647639.0188997,"caller":"snapshot/v3_snapshot.go:119","msg":"created temporary db file","path":"/home/core/assets/backup/snapshot_2021-06-25_190035.db.part"} {"level":"info","ts":"2021-06-25T19:00:39.030Z","caller":"clientv3/maintenance.go:200","msg":"opened snapshot stream; downloading"} {"level":"info","ts":1624647639.0301006,"caller":"snapshot/v3_snapshot.go:127","msg":"fetching snapshot","endpoint":"https://10.0.0.5:2379"} {"level":"info","ts":"2021-06-25T19:00:40.215Z","caller":"clientv3/maintenance.go:208","msg":"completed snapshot read; closing"} {"level":"info","ts":1624647640.6032252,"caller":"snapshot/v3_snapshot.go:142","msg":"fetched snapshot","endpoint":"https://10.0.0.5:2379","size":"114 MB","took":1.584090459} {"level":"info","ts":1624647640.6047094,"caller":"snapshot/v3_snapshot.go:152","msg":"saved","path":"/home/core/assets/backup/snapshot_2021-06-25_190035.db"} Snapshot saved at /home/core/assets/backup/snapshot_2021-06-25_190035.db {"hash":3866667823,"revision":31407,"totalKey":12828,"totalSize":114446336} snapshot db and kube resources are successfully saved to /home/core/assets/backup
apiVersion: config.openshift.io/v1 kind: FeatureGate metadata: name: cluster spec: featureSet: TechPreviewNoUpgrade
oc apply -f enable-tech-preview-no-upgrade.yaml
oc get crd | grep backup
backups.config.openshift.io 2023-10-25T13:32:43Z etcdbackups.operator.openshift.io 2023-10-25T13:32:04Z
apiVersion: operator.openshift.io/v1alpha1 kind: EtcdBackup metadata: name: etcd-single-backup namespace: openshift-etcd spec: pvcName: etcd-backup-pvc 1
oc apply -f etcd-single-backup.yaml
kind: PersistentVolumeClaim apiVersion: v1 metadata: name: etcd-backup-pvc namespace: openshift-etcd spec: accessModes: - ReadWriteOnce resources: requests: storage: 200Gi 1 storageClassName: standard-csi 2 volumeMode: Filesystem
oc apply -f etcd-backup-pvc.yaml
oc get pvc
NAME STATUS VOLUME CAPACITY ACCESS MODES STORAGECLASS AGE etcd-backup-pvc Pending standard-csi 51s
apiVersion: storage.k8s.io/v1 kind: StorageClass metadata: name: etcd-backup-local-storage provisioner: kubernetes.io/no-provisioner volumeBindingMode: WaitForFirstConsumer
oc apply -f etcd-backup-local-storage.yaml
apiVersion: v1 kind: PersistentVolume metadata: name: etcd-backup-pv-fs spec: capacity: storage: 100Gi 1 volumeMode: Filesystem accessModes: - ReadWriteMany persistentVolumeReclaimPolicy: Delete storageClassName: local-storage local: path: /mnt/ nodeAffinity: required: nodeSelectorTerms: - matchExpressions: - key: kubernetes.io/hostname operator: In values: - <example-master-node> 2
oc get nodes
oc get pv
NAME CAPACITY ACCESS MODES RECLAIM POLICY STATUS CLAIM STORAGECLASS REASON AGE etcd-backup-pv-fs 100Gi RWX Delete Available local-storage 10s
kind: PersistentVolumeClaim apiVersion: v1 metadata: name: etcd-backup-pvc spec: accessModes: - ReadWriteMany volumeMode: Filesystem resources: requests: storage: 10Gi 1 storageClassName: local-storage
oc apply -f etcd-backup-pvc.yaml
apiVersion: config.openshift.io/v1alpha1 kind: Backup metadata: name: etcd-recurring-backup spec: etcd: schedule: "20 4 * * *" 1 timeZone: "UTC" pvcName: etcd-backup-pvc
spec: etcd: retentionPolicy: retentionType: RetentionNumber 1 retentionNumber: maxNumberOfBackups: 5 2
spec: etcd: retentionPolicy: retentionType: RetentionSize retentionSize: maxSizeOfBackupsGb: 20 1
oc create -f etcd-recurring-backup.yaml
oc get cronjob -n openshift-etcd
oc get etcd -o=jsonpath='{range .items[0].status.conditions[?(@.type=="EtcdMembersAvailable")]}{.message}{"\n"}'
2 of 3 members are available, ip-10-0-131-183.ec2.internal is unhealthy
oc get machines -A -ojsonpath='{range .items[*]}{@.status.nodeRef.name}{"\t"}{@.status.providerStatus.instanceState}{"\n"}' | grep -v running
ip-10-0-131-183.ec2.internal stopped 1
oc get nodes -o jsonpath='{range .items[*]}{"\n"}{.metadata.name}{"\t"}{range .spec.taints[*]}{.key}{" "}' | grep unreachable
ip-10-0-131-183.ec2.internal node-role.kubernetes.io/master node.kubernetes.io/unreachable node.kubernetes.io/unreachable 1
oc get nodes -l node-role.kubernetes.io/master | grep "NotReady"
ip-10-0-131-183.ec2.internal NotReady master 122m v1.27.3 1
oc get nodes -l node-role.kubernetes.io/master
NAME STATUS ROLES AGE VERSION ip-10-0-131-183.ec2.internal Ready master 6h13m v1.27.3 ip-10-0-164-97.ec2.internal Ready master 6h13m v1.27.3 ip-10-0-154-204.ec2.internal Ready master 6h13m v1.27.3
oc -n openshift-etcd get pods -l k8s-app=etcd
etcd-ip-10-0-131-183.ec2.internal 2/3 Error 7 6h9m 1 etcd-ip-10-0-164-97.ec2.internal 3/3 Running 0 6h6m etcd-ip-10-0-154-204.ec2.internal 3/3 Running 0 6h6m
oc -n openshift-etcd get pods -l k8s-app=etcd
etcd-ip-10-0-131-183.ec2.internal 3/3 Running 0 123m etcd-ip-10-0-164-97.ec2.internal 3/3 Running 0 123m etcd-ip-10-0-154-204.ec2.internal 3/3 Running 0 124m
oc rsh -n openshift-etcd etcd-ip-10-0-154-204.ec2.internal
sh-4.2# etcdctl member list -w table
+------------------+---------+------------------------------+---------------------------+---------------------------+ | ID | STATUS | NAME | PEER ADDRS | CLIENT ADDRS | +------------------+---------+------------------------------+---------------------------+---------------------------+ | 6fc1e7c9db35841d | started | ip-10-0-131-183.ec2.internal | https://10.0.131.183:2380 | https://10.0.131.183:2379 | | 757b6793e2408b6c | started | ip-10-0-164-97.ec2.internal | https://10.0.164.97:2380 | https://10.0.164.97:2379 | | ca8c2990a0aa29d1 | started | ip-10-0-154-204.ec2.internal | https://10.0.154.204:2380 | https://10.0.154.204:2379 | +------------------+---------+------------------------------+---------------------------+---------------------------+
sh-4.2# etcdctl member remove 6fc1e7c9db35841d
Member 6fc1e7c9db35841d removed from cluster ead669ce1fbfb346
sh-4.2# etcdctl member list -w table
+------------------+---------+------------------------------+---------------------------+---------------------------+ | ID | STATUS | NAME | PEER ADDRS | CLIENT ADDRS | +------------------+---------+------------------------------+---------------------------+---------------------------+ | 757b6793e2408b6c | started | ip-10-0-164-97.ec2.internal | https://10.0.164.97:2380 | https://10.0.164.97:2379 | | ca8c2990a0aa29d1 | started | ip-10-0-154-204.ec2.internal | https://10.0.154.204:2380 | https://10.0.154.204:2379 | +------------------+---------+------------------------------+---------------------------+---------------------------+
oc patch etcd/cluster --type=merge -p '{"spec": {"unsupportedConfigOverrides": {"useUnsupportedUnsafeNonHANonProductionUnstableEtcd": true}}}'
oc delete node <node_name>
oc delete node ip-10-0-131-183.ec2.internal
oc get secrets -n openshift-etcd | grep ip-10-0-131-183.ec2.internal 1
etcd-peer-ip-10-0-131-183.ec2.internal kubernetes.io/tls 2 47m etcd-serving-ip-10-0-131-183.ec2.internal kubernetes.io/tls 2 47m etcd-serving-metrics-ip-10-0-131-183.ec2.internal kubernetes.io/tls 2 47m
oc delete secret -n openshift-etcd etcd-peer-ip-10-0-131-183.ec2.internal
oc delete secret -n openshift-etcd etcd-serving-ip-10-0-131-183.ec2.internal
oc delete secret -n openshift-etcd etcd-serving-metrics-ip-10-0-131-183.ec2.internal
oc get machines -n openshift-machine-api -o wide
NAME PHASE TYPE REGION ZONE AGE NODE PROVIDERID STATE clustername-8qw5l-master-0 Running m4.xlarge us-east-1 us-east-1a 3h37m ip-10-0-131-183.ec2.internal aws:///us-east-1a/i-0ec2782f8287dfb7e stopped 1 clustername-8qw5l-master-1 Running m4.xlarge us-east-1 us-east-1b 3h37m ip-10-0-154-204.ec2.internal aws:///us-east-1b/i-096c349b700a19631 running clustername-8qw5l-master-2 Running m4.xlarge us-east-1 us-east-1c 3h37m ip-10-0-164-97.ec2.internal aws:///us-east-1c/i-02626f1dba9ed5bba running clustername-8qw5l-worker-us-east-1a-wbtgd Running m4.large us-east-1 us-east-1a 3h28m ip-10-0-129-226.ec2.internal aws:///us-east-1a/i-010ef6279b4662ced running clustername-8qw5l-worker-us-east-1b-lrdxb Running m4.large us-east-1 us-east-1b 3h28m ip-10-0-144-248.ec2.internal aws:///us-east-1b/i-0cb45ac45a166173b running clustername-8qw5l-worker-us-east-1c-pkg26 Running m4.large us-east-1 us-east-1c 3h28m ip-10-0-170-181.ec2.internal aws:///us-east-1c/i-06861c00007751b0a running
oc delete machine -n openshift-machine-api clustername-8qw5l-master-0 1
oc get machines -n openshift-machine-api -o wide
NAME PHASE TYPE REGION ZONE AGE NODE PROVIDERID STATE clustername-8qw5l-master-1 Running m4.xlarge us-east-1 us-east-1b 3h37m ip-10-0-154-204.ec2.internal aws:///us-east-1b/i-096c349b700a19631 running clustername-8qw5l-master-2 Running m4.xlarge us-east-1 us-east-1c 3h37m ip-10-0-164-97.ec2.internal aws:///us-east-1c/i-02626f1dba9ed5bba running clustername-8qw5l-master-3 Provisioning m4.xlarge us-east-1 us-east-1a 85s ip-10-0-133-53.ec2.internal aws:///us-east-1a/i-015b0888fe17bc2c8 running 1 clustername-8qw5l-worker-us-east-1a-wbtgd Running m4.large us-east-1 us-east-1a 3h28m ip-10-0-129-226.ec2.internal aws:///us-east-1a/i-010ef6279b4662ced running clustername-8qw5l-worker-us-east-1b-lrdxb Running m4.large us-east-1 us-east-1b 3h28m ip-10-0-144-248.ec2.internal aws:///us-east-1b/i-0cb45ac45a166173b running clustername-8qw5l-worker-us-east-1c-pkg26 Running m4.large us-east-1 us-east-1c 3h28m ip-10-0-170-181.ec2.internal aws:///us-east-1c/i-06861c00007751b0a running
oc patch etcd/cluster --type=merge -p '{"spec": {"unsupportedConfigOverrides": null}}'
oc get etcd/cluster -oyaml
EtcdCertSignerControllerDegraded: [Operation cannot be fulfilled on secrets "etcd-peer-sno-0": the object has been modified; please apply your changes to the latest version and try again, Operation cannot be fulfilled on secrets "etcd-serving-sno-0": the object has been modified; please apply your changes to the latest version and try again, Operation cannot be fulfilled on secrets "etcd-serving-metrics-sno-0": the object has been modified; please apply your changes to the latest version and try again]
oc -n openshift-etcd get pods -l k8s-app=etcd
etcd-ip-10-0-133-53.ec2.internal 3/3 Running 0 7m49s etcd-ip-10-0-164-97.ec2.internal 3/3 Running 0 123m etcd-ip-10-0-154-204.ec2.internal 3/3 Running 0 124m
oc patch etcd cluster -p='{"spec": {"forceRedeploymentReason": "recovery-'"USD( date --rfc-3339=ns )"'"}}' --type=merge 1
oc rsh -n openshift-etcd etcd-ip-10-0-154-204.ec2.internal
sh-4.2# etcdctl member list -w table
+------------------+---------+------------------------------+---------------------------+---------------------------+ | ID | STATUS | NAME | PEER ADDRS | CLIENT ADDRS | +------------------+---------+------------------------------+---------------------------+---------------------------+ | 5eb0d6b8ca24730c | started | ip-10-0-133-53.ec2.internal | https://10.0.133.53:2380 | https://10.0.133.53:2379 | | 757b6793e2408b6c | started | ip-10-0-164-97.ec2.internal | https://10.0.164.97:2380 | https://10.0.164.97:2379 | | ca8c2990a0aa29d1 | started | ip-10-0-154-204.ec2.internal | https://10.0.154.204:2380 | https://10.0.154.204:2379 | +------------------+---------+------------------------------+---------------------------+---------------------------+
oc debug node/ip-10-0-131-183.ec2.internal 1
sh-4.2# chroot /host
sh-4.2# mkdir /var/lib/etcd-backup
sh-4.2# mv /etc/kubernetes/manifests/etcd-pod.yaml /var/lib/etcd-backup/
sh-4.2# mv /var/lib/etcd/ /tmp
oc -n openshift-etcd get pods -l k8s-app=etcd
etcd-ip-10-0-131-183.ec2.internal 2/3 Error 7 6h9m etcd-ip-10-0-164-97.ec2.internal 3/3 Running 0 6h6m etcd-ip-10-0-154-204.ec2.internal 3/3 Running 0 6h6m
oc rsh -n openshift-etcd etcd-ip-10-0-154-204.ec2.internal
sh-4.2# etcdctl member list -w table
+------------------+---------+------------------------------+---------------------------+---------------------------+ | ID | STATUS | NAME | PEER ADDRS | CLIENT ADDRS | +------------------+---------+------------------------------+---------------------------+---------------------------+ | 62bcf33650a7170a | started | ip-10-0-131-183.ec2.internal | https://10.0.131.183:2380 | https://10.0.131.183:2379 | | b78e2856655bc2eb | started | ip-10-0-164-97.ec2.internal | https://10.0.164.97:2380 | https://10.0.164.97:2379 | | d022e10b498760d5 | started | ip-10-0-154-204.ec2.internal | https://10.0.154.204:2380 | https://10.0.154.204:2379 | +------------------+---------+------------------------------+---------------------------+---------------------------+
sh-4.2# etcdctl member remove 62bcf33650a7170a
Member 62bcf33650a7170a removed from cluster ead669ce1fbfb346
sh-4.2# etcdctl member list -w table
+------------------+---------+------------------------------+---------------------------+---------------------------+ | ID | STATUS | NAME | PEER ADDRS | CLIENT ADDRS | +------------------+---------+------------------------------+---------------------------+---------------------------+ | b78e2856655bc2eb | started | ip-10-0-164-97.ec2.internal | https://10.0.164.97:2380 | https://10.0.164.97:2379 | | d022e10b498760d5 | started | ip-10-0-154-204.ec2.internal | https://10.0.154.204:2380 | https://10.0.154.204:2379 | +------------------+---------+------------------------------+---------------------------+---------------------------+
oc patch etcd/cluster --type=merge -p '{"spec": {"unsupportedConfigOverrides": {"useUnsupportedUnsafeNonHANonProductionUnstableEtcd": true}}}'
oc get secrets -n openshift-etcd | grep ip-10-0-131-183.ec2.internal 1
etcd-peer-ip-10-0-131-183.ec2.internal kubernetes.io/tls 2 47m etcd-serving-ip-10-0-131-183.ec2.internal kubernetes.io/tls 2 47m etcd-serving-metrics-ip-10-0-131-183.ec2.internal kubernetes.io/tls 2 47m
oc delete secret -n openshift-etcd etcd-peer-ip-10-0-131-183.ec2.internal
oc delete secret -n openshift-etcd etcd-serving-ip-10-0-131-183.ec2.internal
oc delete secret -n openshift-etcd etcd-serving-metrics-ip-10-0-131-183.ec2.internal
oc patch etcd cluster -p='{"spec": {"forceRedeploymentReason": "single-master-recovery-'"USD( date --rfc-3339=ns )"'"}}' --type=merge 1
oc patch etcd/cluster --type=merge -p '{"spec": {"unsupportedConfigOverrides": null}}'
oc get etcd/cluster -oyaml
EtcdCertSignerControllerDegraded: [Operation cannot be fulfilled on secrets "etcd-peer-sno-0": the object has been modified; please apply your changes to the latest version and try again, Operation cannot be fulfilled on secrets "etcd-serving-sno-0": the object has been modified; please apply your changes to the latest version and try again, Operation cannot be fulfilled on secrets "etcd-serving-metrics-sno-0": the object has been modified; please apply your changes to the latest version and try again]
oc rsh -n openshift-etcd etcd-ip-10-0-154-204.ec2.internal
sh-4.2# etcdctl endpoint health
https://10.0.131.183:2379 is healthy: successfully committed proposal: took = 16.671434ms https://10.0.154.204:2379 is healthy: successfully committed proposal: took = 16.698331ms https://10.0.164.97:2379 is healthy: successfully committed proposal: took = 16.621645ms
oc -n openshift-etcd get pods -l k8s-app=etcd -o wide
etcd-openshift-control-plane-0 5/5 Running 11 3h56m 192.168.10.9 openshift-control-plane-0 <none> <none> etcd-openshift-control-plane-1 5/5 Running 0 3h54m 192.168.10.10 openshift-control-plane-1 <none> <none> etcd-openshift-control-plane-2 5/5 Running 0 3h58m 192.168.10.11 openshift-control-plane-2 <none> <none>
oc rsh -n openshift-etcd etcd-openshift-control-plane-0
sh-4.2# etcdctl member list -w table
+------------------+---------+--------------------+---------------------------+---------------------------+---------------------+ | ID | STATUS | NAME | PEER ADDRS | CLIENT ADDRS | IS LEARNER | +------------------+---------+--------------------+---------------------------+---------------------------+---------------------+ | 7a8197040a5126c8 | started | openshift-control-plane-2 | https://192.168.10.11:2380/ | https://192.168.10.11:2379/ | false | | 8d5abe9669a39192 | started | openshift-control-plane-1 | https://192.168.10.10:2380/ | https://192.168.10.10:2379/ | false | | cc3830a72fc357f9 | started | openshift-control-plane-0 | https://192.168.10.9:2380/ | https://192.168.10.9:2379/ | false | +------------------+---------+--------------------+---------------------------+---------------------------+---------------------+
sh-4.2# etcdctl member remove 7a8197040a5126c8
Member 7a8197040a5126c8 removed from cluster b23536c33f2cdd1b
sh-4.2# etcdctl member list -w table
+------------------+---------+--------------------+---------------------------+---------------------------+-------------------------+ | ID | STATUS | NAME | PEER ADDRS | CLIENT ADDRS | IS LEARNER | +------------------+---------+--------------------+---------------------------+---------------------------+-------------------------+ | cc3830a72fc357f9 | started | openshift-control-plane-2 | https://192.168.10.11:2380/ | https://192.168.10.11:2379/ | false | | 8d5abe9669a39192 | started | openshift-control-plane-1 | https://192.168.10.10:2380/ | https://192.168.10.10:2379/ | false | +------------------+---------+--------------------+---------------------------+---------------------------+-------------------------+
oc patch etcd/cluster --type=merge -p '{"spec": {"unsupportedConfigOverrides": {"useUnsupportedUnsafeNonHANonProductionUnstableEtcd": true}}}'
oc get secrets -n openshift-etcd | grep openshift-control-plane-2
etcd-peer-openshift-control-plane-2 kubernetes.io/tls 2 134m etcd-serving-metrics-openshift-control-plane-2 kubernetes.io/tls 2 134m etcd-serving-openshift-control-plane-2 kubernetes.io/tls 2 134m
oc delete secret etcd-peer-openshift-control-plane-2 -n openshift-etcd secret "etcd-peer-openshift-control-plane-2" deleted
oc delete secret etcd-serving-metrics-openshift-control-plane-2 -n openshift-etcd secret "etcd-serving-metrics-openshift-control-plane-2" deleted
oc delete secret etcd-serving-openshift-control-plane-2 -n openshift-etcd secret "etcd-serving-openshift-control-plane-2" deleted
oc get machines -n openshift-machine-api -o wide
NAME PHASE TYPE REGION ZONE AGE NODE PROVIDERID STATE examplecluster-control-plane-0 Running 3h11m openshift-control-plane-0 baremetalhost:///openshift-machine-api/openshift-control-plane-0/da1ebe11-3ff2-41c5-b099-0aa41222964e externally provisioned 1 examplecluster-control-plane-1 Running 3h11m openshift-control-plane-1 baremetalhost:///openshift-machine-api/openshift-control-plane-1/d9f9acbc-329c-475e-8d81-03b20280a3e1 externally provisioned examplecluster-control-plane-2 Running 3h11m openshift-control-plane-2 baremetalhost:///openshift-machine-api/openshift-control-plane-2/3354bdac-61d8-410f-be5b-6a395b056135 externally provisioned examplecluster-compute-0 Running 165m openshift-compute-0 baremetalhost:///openshift-machine-api/openshift-compute-0/3d685b81-7410-4bb3-80ec-13a31858241f provisioned examplecluster-compute-1 Running 165m openshift-compute-1 baremetalhost:///openshift-machine-api/openshift-compute-1/0fdae6eb-2066-4241-91dc-e7ea72ab13b9 provisioned
oc get clusteroperator baremetal
NAME VERSION AVAILABLE PROGRESSING DEGRADED SINCE MESSAGE baremetal 4.14.0 True False False 3d15h
oc delete bmh openshift-control-plane-2 -n openshift-machine-api
baremetalhost.metal3.io "openshift-control-plane-2" deleted
oc delete machine -n openshift-machine-api examplecluster-control-plane-2
oc edit machine -n openshift-machine-api examplecluster-control-plane-2
finalizers: - machine.machine.openshift.io
machine.machine.openshift.io/examplecluster-control-plane-2 edited
oc get machines -n openshift-machine-api -o wide
NAME PHASE TYPE REGION ZONE AGE NODE PROVIDERID STATE examplecluster-control-plane-0 Running 3h11m openshift-control-plane-0 baremetalhost:///openshift-machine-api/openshift-control-plane-0/da1ebe11-3ff2-41c5-b099-0aa41222964e externally provisioned examplecluster-control-plane-1 Running 3h11m openshift-control-plane-1 baremetalhost:///openshift-machine-api/openshift-control-plane-1/d9f9acbc-329c-475e-8d81-03b20280a3e1 externally provisioned examplecluster-compute-0 Running 165m openshift-compute-0 baremetalhost:///openshift-machine-api/openshift-compute-0/3d685b81-7410-4bb3-80ec-13a31858241f provisioned examplecluster-compute-1 Running 165m openshift-compute-1 baremetalhost:///openshift-machine-api/openshift-compute-1/0fdae6eb-2066-4241-91dc-e7ea72ab13b9 provisioned
oc get nodes NAME STATUS ROLES AGE VERSION openshift-control-plane-0 Ready master 3h24m v1.27.3 openshift-control-plane-1 Ready master 3h24m v1.27.3 openshift-compute-0 Ready worker 176m v1.27.3 openshift-compute-1 Ready worker 176m v1.27.3
cat <<EOF | oc apply -f - apiVersion: v1 kind: Secret metadata: name: openshift-control-plane-2-bmc-secret namespace: openshift-machine-api data: password: <password> username: <username> type: Opaque --- apiVersion: metal3.io/v1alpha1 kind: BareMetalHost metadata: name: openshift-control-plane-2 namespace: openshift-machine-api spec: automatedCleaningMode: disabled bmc: address: redfish://10.46.61.18:443/redfish/v1/Systems/1 credentialsName: openshift-control-plane-2-bmc-secret disableCertificateVerification: true bootMACAddress: 48:df:37:b0:8a:a0 bootMode: UEFI externallyProvisioned: false online: true rootDeviceHints: deviceName: /dev/disk/by-id/scsi-<serial_number> userData: name: master-user-data-managed namespace: openshift-machine-api EOF
oc get bmh -n openshift-machine-api NAME STATE CONSUMER ONLINE ERROR AGE openshift-control-plane-0 externally provisioned examplecluster-control-plane-0 true 4h48m openshift-control-plane-1 externally provisioned examplecluster-control-plane-1 true 4h48m openshift-control-plane-2 available examplecluster-control-plane-3 true 47m openshift-compute-0 provisioned examplecluster-compute-0 true 4h48m openshift-compute-1 provisioned examplecluster-compute-1 true 4h48m
oc get machines -n openshift-machine-api -o wide
NAME PHASE TYPE REGION ZONE AGE NODE PROVIDERID STATE examplecluster-control-plane-0 Running 3h11m openshift-control-plane-0 baremetalhost:///openshift-machine-api/openshift-control-plane-0/da1ebe11-3ff2-41c5-b099-0aa41222964e externally provisioned 1 examplecluster-control-plane-1 Running 3h11m openshift-control-plane-1 baremetalhost:///openshift-machine-api/openshift-control-plane-1/d9f9acbc-329c-475e-8d81-03b20280a3e1 externally provisioned examplecluster-control-plane-2 Running 3h11m openshift-control-plane-2 baremetalhost:///openshift-machine-api/openshift-control-plane-2/3354bdac-61d8-410f-be5b-6a395b056135 externally provisioned examplecluster-compute-0 Running 165m openshift-compute-0 baremetalhost:///openshift-machine-api/openshift-compute-0/3d685b81-7410-4bb3-80ec-13a31858241f provisioned examplecluster-compute-1 Running 165m openshift-compute-1 baremetalhost:///openshift-machine-api/openshift-compute-1/0fdae6eb-2066-4241-91dc-e7ea72ab13b9 provisioned
oc get bmh -n openshift-machine-api
oc get bmh -n openshift-machine-api NAME STATE CONSUMER ONLINE ERROR AGE openshift-control-plane-0 externally provisioned examplecluster-control-plane-0 true 4h48m openshift-control-plane-1 externally provisioned examplecluster-control-plane-1 true 4h48m openshift-control-plane-2 provisioned examplecluster-control-plane-3 true 47m openshift-compute-0 provisioned examplecluster-compute-0 true 4h48m openshift-compute-1 provisioned examplecluster-compute-1 true 4h48m
oc get nodes
oc get nodes NAME STATUS ROLES AGE VERSION openshift-control-plane-0 Ready master 4h26m v1.27.3 openshift-control-plane-1 Ready master 4h26m v1.27.3 openshift-control-plane-2 Ready master 12m v1.27.3 openshift-compute-0 Ready worker 3h58m v1.27.3 openshift-compute-1 Ready worker 3h58m v1.27.3
oc patch etcd/cluster --type=merge -p '{"spec": {"unsupportedConfigOverrides": null}}'
oc get etcd/cluster -oyaml
EtcdCertSignerControllerDegraded: [Operation cannot be fulfilled on secrets "etcd-peer-sno-0": the object has been modified; please apply your changes to the latest version and try again, Operation cannot be fulfilled on secrets "etcd-serving-sno-0": the object has been modified; please apply your changes to the latest version and try again, Operation cannot be fulfilled on secrets "etcd-serving-metrics-sno-0": the object has been modified; please apply your changes to the latest version and try again]
oc -n openshift-etcd get pods -l k8s-app=etcd
etcd-openshift-control-plane-0 5/5 Running 0 105m etcd-openshift-control-plane-1 5/5 Running 0 107m etcd-openshift-control-plane-2 5/5 Running 0 103m
oc patch etcd cluster -p='{"spec": {"forceRedeploymentReason": "recovery-'"USD( date --rfc-3339=ns )"'"}}' --type=merge 1
oc rsh -n openshift-etcd etcd-openshift-control-plane-0
sh-4.2# etcdctl member list -w table
+------------------+---------+--------------------+---------------------------+---------------------------+-----------------+ | ID | STATUS | NAME | PEER ADDRS | CLIENT ADDRS | IS LEARNER | +------------------+---------+--------------------+---------------------------+---------------------------+-----------------+ | 7a8197040a5126c8 | started | openshift-control-plane-2 | https://192.168.10.11:2380 | https://192.168.10.11:2379 | false | | 8d5abe9669a39192 | started | openshift-control-plane-1 | https://192.168.10.10:2380 | https://192.168.10.10:2379 | false | | cc3830a72fc357f9 | started | openshift-control-plane-0 | https://192.168.10.9:2380 | https://192.168.10.9:2379 | false | +------------------+---------+--------------------+---------------------------+---------------------------+-----------------+
etcdctl endpoint health --cluster
https://192.168.10.10:2379 is healthy: successfully committed proposal: took = 8.973065ms https://192.168.10.9:2379 is healthy: successfully committed proposal: took = 11.559829ms https://192.168.10.11:2379 is healthy: successfully committed proposal: took = 11.665203ms
oc get etcd -o=jsonpath='{range.items[0].status.conditions[?(@.type=="NodeInstallerProgressing")]}{.reason}{"\n"}{.message}{"\n"}'
AllNodesAtLatestRevision
sudo mv -v /etc/kubernetes/manifests/etcd-pod.yaml /tmp
sudo crictl ps | grep etcd | egrep -v "operator|etcd-guard"
sudo mv -v /etc/kubernetes/manifests/kube-apiserver-pod.yaml /tmp
sudo crictl ps | grep kube-apiserver | egrep -v "operator|guard"
sudo mv -v /etc/kubernetes/manifests/kube-controller-manager-pod.yaml /tmp
sudo crictl ps | grep kube-controller-manager | egrep -v "operator|guard"
sudo mv -v /etc/kubernetes/manifests/kube-scheduler-pod.yaml /tmp
sudo crictl ps | grep kube-scheduler | egrep -v "operator|guard"
sudo mv -v /var/lib/etcd/ /tmp
sudo mv -v /etc/kubernetes/manifests/keepalived.yaml /tmp
sudo crictl ps --name keepalived
ip -o address | egrep '<api_vip>|<ingress_vip>'
sudo ip address del <reported_vip> dev <reported_vip_device>
ip -o address | grep <api_vip>
sudo -E /usr/local/bin/cluster-restore.sh /home/core/assets/backup
...stopping kube-scheduler-pod.yaml ...stopping kube-controller-manager-pod.yaml ...stopping etcd-pod.yaml ...stopping kube-apiserver-pod.yaml Waiting for container etcd to stop .complete Waiting for container etcdctl to stop .............................complete Waiting for container etcd-metrics to stop complete Waiting for container kube-controller-manager to stop complete Waiting for container kube-apiserver to stop ..........................................................................................complete Waiting for container kube-scheduler to stop complete Moving etcd data-dir /var/lib/etcd/member to /var/lib/etcd-backup starting restore-etcd static pod starting kube-apiserver-pod.yaml static-pod-resources/kube-apiserver-pod-7/kube-apiserver-pod.yaml starting kube-controller-manager-pod.yaml static-pod-resources/kube-controller-manager-pod-7/kube-controller-manager-pod.yaml starting kube-scheduler-pod.yaml static-pod-resources/kube-scheduler-pod-8/kube-scheduler-pod.yaml
oc get nodes -w
NAME STATUS ROLES AGE VERSION host-172-25-75-28 Ready master 3d20h v1.27.3 host-172-25-75-38 Ready infra,worker 3d20h v1.27.3 host-172-25-75-40 Ready master 3d20h v1.27.3 host-172-25-75-65 Ready master 3d20h v1.27.3 host-172-25-75-74 Ready infra,worker 3d20h v1.27.3 host-172-25-75-79 Ready worker 3d20h v1.27.3 host-172-25-75-86 Ready worker 3d20h v1.27.3 host-172-25-75-98 Ready infra,worker 3d20h v1.27.3
ssh -i <ssh-key-path> core@<master-hostname>
sh-4.4# pwd /var/lib/kubelet/pki sh-4.4# ls kubelet-client-2022-04-28-11-24-09.pem kubelet-server-2022-04-28-11-24-15.pem kubelet-client-current.pem kubelet-server-current.pem
sudo systemctl restart kubelet.service
oc get csr
NAME AGE SIGNERNAME REQUESTOR CONDITION csr-2s94x 8m3s kubernetes.io/kubelet-serving system:node:<node_name> Pending 1 csr-4bd6t 8m3s kubernetes.io/kubelet-serving system:node:<node_name> Pending 2 csr-4hl85 13m kubernetes.io/kube-apiserver-client-kubelet system:serviceaccount:openshift-machine-config-operator:node-bootstrapper Pending 3 csr-zhhhp 3m8s kubernetes.io/kube-apiserver-client-kubelet system:serviceaccount:openshift-machine-config-operator:node-bootstrapper Pending 4
oc describe csr <csr_name> 1
oc adm certificate approve <csr_name>
oc adm certificate approve <csr_name>
sudo crictl ps | grep etcd | egrep -v "operator|etcd-guard"
3ad41b7908e32 36f86e2eeaaffe662df0d21041eb22b8198e0e58abeeae8c743c3e6e977e8009 About a minute ago Running etcd 0 7c05f8af362f0
oc -n openshift-etcd get pods -l k8s-app=etcd
NAME READY STATUS RESTARTS AGE etcd-ip-10-0-143-125.ec2.internal 1/1 Running 1 2m47s
oc -n openshift-ovn-kubernetes delete pod -l app=ovnkube-control-plane
oc -n openshift-ovn-kubernetes get pod -l app=ovnkube-control-plane
sudo rm -f /var/lib/ovn-ic/etc/*.db
sudo systemctl restart ovs-vswitchd ovsdb-server
oc -n openshift-ovn-kubernetes delete pod -l app=ovnkube-node --field-selector=spec.nodeName==<node>
oc get po -n openshift-ovn-kubernetes
oc delete node <node>
ssh -i <ssh-key-path> core@<node>
sudo mv /var/lib/kubelet/pki/* /tmp
sudo systemctl restart kubelet.service
oc get csr
NAME AGE SIGNERNAME REQUESTOR CONDITION csr-<uuid> 8m3s kubernetes.io/kubelet-serving system:node:<node_name> Pending
adm certificate approve csr-<uuid>
oc get nodes
oc -n openshift-ovn-kubernetes get pod -l app=ovnkube-node --field-selector=spec.nodeName==<node>
oc get machines -n openshift-machine-api -o wide
NAME PHASE TYPE REGION ZONE AGE NODE PROVIDERID STATE clustername-8qw5l-master-0 Running m4.xlarge us-east-1 us-east-1a 3h37m ip-10-0-131-183.ec2.internal aws:///us-east-1a/i-0ec2782f8287dfb7e stopped 1 clustername-8qw5l-master-1 Running m4.xlarge us-east-1 us-east-1b 3h37m ip-10-0-143-125.ec2.internal aws:///us-east-1b/i-096c349b700a19631 running clustername-8qw5l-master-2 Running m4.xlarge us-east-1 us-east-1c 3h37m ip-10-0-154-194.ec2.internal aws:///us-east-1c/i-02626f1dba9ed5bba running clustername-8qw5l-worker-us-east-1a-wbtgd Running m4.large us-east-1 us-east-1a 3h28m ip-10-0-129-226.ec2.internal aws:///us-east-1a/i-010ef6279b4662ced running clustername-8qw5l-worker-us-east-1b-lrdxb Running m4.large us-east-1 us-east-1b 3h28m ip-10-0-144-248.ec2.internal aws:///us-east-1b/i-0cb45ac45a166173b running clustername-8qw5l-worker-us-east-1c-pkg26 Running m4.large us-east-1 us-east-1c 3h28m ip-10-0-170-181.ec2.internal aws:///us-east-1c/i-06861c00007751b0a running
oc delete machine -n openshift-machine-api clustername-8qw5l-master-0 1
oc get machines -n openshift-machine-api -o wide
NAME PHASE TYPE REGION ZONE AGE NODE PROVIDERID STATE clustername-8qw5l-master-1 Running m4.xlarge us-east-1 us-east-1b 3h37m ip-10-0-143-125.ec2.internal aws:///us-east-1b/i-096c349b700a19631 running clustername-8qw5l-master-2 Running m4.xlarge us-east-1 us-east-1c 3h37m ip-10-0-154-194.ec2.internal aws:///us-east-1c/i-02626f1dba9ed5bba running clustername-8qw5l-master-3 Provisioning m4.xlarge us-east-1 us-east-1a 85s ip-10-0-173-171.ec2.internal aws:///us-east-1a/i-015b0888fe17bc2c8 running 1 clustername-8qw5l-worker-us-east-1a-wbtgd Running m4.large us-east-1 us-east-1a 3h28m ip-10-0-129-226.ec2.internal aws:///us-east-1a/i-010ef6279b4662ced running clustername-8qw5l-worker-us-east-1b-lrdxb Running m4.large us-east-1 us-east-1b 3h28m ip-10-0-144-248.ec2.internal aws:///us-east-1b/i-0cb45ac45a166173b running clustername-8qw5l-worker-us-east-1c-pkg26 Running m4.large us-east-1 us-east-1c 3h28m ip-10-0-170-181.ec2.internal aws:///us-east-1c/i-06861c00007751b0a running
oc patch etcd/cluster --type=merge -p '{"spec": {"unsupportedConfigOverrides": {"useUnsupportedUnsafeNonHANonProductionUnstableEtcd": true}}}'
export KUBECONFIG=/etc/kubernetes/static-pod-resources/kube-apiserver-certs/secrets/node-kubeconfigs/localhost-recovery.kubeconfig
oc patch etcd cluster -p='{"spec": {"forceRedeploymentReason": "recovery-'"USD( date --rfc-3339=ns )"'"}}' --type=merge 1
oc patch etcd/cluster --type=merge -p '{"spec": {"unsupportedConfigOverrides": null}}'
oc get etcd/cluster -oyaml
oc get etcd -o=jsonpath='{range .items[0].status.conditions[?(@.type=="NodeInstallerProgressing")]}{.reason}{"\n"}{.message}{"\n"}'
AllNodesAtLatestRevision 3 nodes are at revision 7 1
oc patch kubeapiserver cluster -p='{"spec": {"forceRedeploymentReason": "recovery-'"USD( date --rfc-3339=ns )"'"}}' --type=merge
oc get kubeapiserver -o=jsonpath='{range .items[0].status.conditions[?(@.type=="NodeInstallerProgressing")]}{.reason}{"\n"}{.message}{"\n"}'
AllNodesAtLatestRevision 3 nodes are at revision 7 1
oc patch kubecontrollermanager cluster -p='{"spec": {"forceRedeploymentReason": "recovery-'"USD( date --rfc-3339=ns )"'"}}' --type=merge
oc get kubecontrollermanager -o=jsonpath='{range .items[0].status.conditions[?(@.type=="NodeInstallerProgressing")]}{.reason}{"\n"}{.message}{"\n"}'
AllNodesAtLatestRevision 3 nodes are at revision 7 1
oc patch kubescheduler cluster -p='{"spec": {"forceRedeploymentReason": "recovery-'"USD( date --rfc-3339=ns )"'"}}' --type=merge
oc get kubescheduler -o=jsonpath='{range .items[0].status.conditions[?(@.type=="NodeInstallerProgressing")]}{.reason}{"\n"}{.message}{"\n"}'
AllNodesAtLatestRevision 3 nodes are at revision 7 1
oc -n openshift-etcd get pods -l k8s-app=etcd
etcd-ip-10-0-143-125.ec2.internal 2/2 Running 0 9h etcd-ip-10-0-154-194.ec2.internal 2/2 Running 0 9h etcd-ip-10-0-173-171.ec2.internal 2/2 Running 0 9h
export KUBECONFIG=<installation_directory>/auth/kubeconfig
oc whoami
oc get csr
NAME AGE SIGNERNAME REQUESTOR CONDITION csr-2s94x 8m3s kubernetes.io/kubelet-serving system:node:<node_name> Pending 1 csr-4bd6t 8m3s kubernetes.io/kubelet-serving system:node:<node_name> Pending csr-4hl85 13m kubernetes.io/kube-apiserver-client-kubelet system:serviceaccount:openshift-machine-config-operator:node-bootstrapper Pending 2 csr-zhhhp 3m8s kubernetes.io/kube-apiserver-client-kubelet system:serviceaccount:openshift-machine-config-operator:node-bootstrapper Pending
oc describe csr <csr_name> 1
oc adm certificate approve <csr_name>
oc adm certificate approve <csr_name>