Chapter 4. Uninstalling OpenShift Data Foundation 4.1. Uninstalling OpenShift Data Foundation in Internal-attached devices mode Use the steps in this section to uninstall OpenShift Data Foundation. Uninstall Annotations Annotations on the Storage Cluster are used to change the behavior of the uninstall process. To define the uninstall behavior, the following two annotations have been introduced in the storage cluster: uninstall.ocs.openshift.io/cleanup-policy: delete uninstall.ocs.openshift.io/mode: graceful The following table provides information on the different values that can used with these annotations: Table 4.1. uninstall.ocs.openshift.io uninstall annotations descriptions Annotation Value Default Behavior cleanup-policy delete Yes Rook cleans up the physical drives and the DataDirHostPath cleanup-policy retain No Rook does not clean up the physical drives and the DataDirHostPath mode graceful Yes Rook and NooBaa pauses the uninstall process until the administrator/user removes the Persistent Volume Claims (PVCs) and Object Bucket Claims (OBCs) mode forced No Rook and NooBaa proceeds with uninstall even if the PVCs/OBCs provisioned using Rook and NooBaa exist respectively Edit the value of the annotation to change the cleanup policy or the uninstall mode. Expected output for both commands: Prerequisites Ensure that the OpenShift Data Foundation cluster is in a healthy state. The uninstall process can fail when some of the pods are not terminated successfully due to insufficient resources or nodes. In case the cluster is in an unhealthy state, contact Red Hat Customer Support before uninstalling OpenShift Data Foundation. Ensure that applications are not consuming persistent volume claims (PVCs) or object bucket claims (OBCs) using the storage classes provided by OpenShift Data Foundation. If any custom resources (such as custom storage classes, cephblockpools) were created by the admin, they must be deleted by the admin after removing the resources which consumed them. Procedure Delete the volume snapshots that are using OpenShift Data Foundation. List the volume snapshots from all the namespaces. From the output of the command, identify and delete the volume snapshots that are using OpenShift Data Foundation. <VOLUME-SNAPSHOT-NAME> Is the name of the volume snapshot <NAMESPACE> Is the project namespace Delete PVCs and OBCs that are using OpenShift Data Foundation. In the default uninstall mode (graceful), the uninstaller waits till all the PVCs and OBCs that use OpenShift Data Foundation are deleted. If you want to delete the Storage Cluster without deleting the PVCs, you can set the uninstall mode annotation to forced and skip this step. Doing so results in orphan PVCs and OBCs in the system. Delete OpenShift Container Platform monitoring stack PVCs using OpenShift Data Foundation. See Removing monitoring stack from OpenShift Data Foundation Delete OpenShift Container Platform Registry PVCs using OpenShift Data Foundation. Removing OpenShift Container Platform registry from OpenShift Data Foundation Delete OpenShift Container Platform logging PVCs using OpenShift Data Foundation. Removing the cluster logging operator from OpenShift Data Foundation Delete the other PVCs and OBCs provisioned using OpenShift Data Foundation. Given below is a sample script to identify the PVCs and OBCs provisioned using OpenShift Data Foundation. The script ignores the PVCs that are used internally by OpenShift Data Foundation. Note Omit RGW_PROVISIONER for cloud platforms. Delete the OBCs. <obc-name> Is the name of the OBC <project-name> Is the name of the project Delete the PVCs. <pvc-name> Is the name of the PVC <project-name> Is the name of the project Note Ensure that you have removed any custom backing stores, bucket classes, etc., created in the cluster. Delete the Storage System object and wait for the removal of the associated resources. Check the cleanup pods if the uninstall.ocs.openshift.io/cleanup-policy was set to delete (default) and ensure that their status is Completed . Example output: Confirm that the directory /var/lib/rook is now empty. This directory is empty only if the uninstall.ocs.openshift.io/cleanup-policy annotation was set to delete (default). If encryption was enabled at the time of install, remove dm-crypt managed device-mapper mapping from the OSD devices on all the OpenShift Data Foundation nodes. Create a debug pod and chroot to the host on the storage node. <node-name> Is the name of the node Get Device names and make note of the OpenShift Data Foundation devices. Example output: Remove the mapped device. Important If the above command gets stuck due to insufficient privileges, run the following commands: Press CTRL+Z to exit the above command. Find PID of the process which was stuck. Terminate the process using kill command. <PID> Is the process ID Verify that the device name is removed. Delete the namespace and wait till the deletion is complete. You need to switch to another project if openshift-storage is the active project. For example: The project is deleted if the following command returns a NotFound error. Note While uninstalling OpenShift Data Foundation, if namespace is not deleted completely and remains in Terminating state, perform the steps in Troubleshooting and deleting remaining resources during Uninstall to identify objects that are blocking the namespace from being terminated. Delete local storage operator configurations if you have deployed OpenShift Data Foundation using local storage devices. See Removing local storage operator configurations . Unlabel the storage nodes. Remove the OpenShift Data Foundation taint if the nodes were tainted. Confirm all the Persistent volumes (PVs) provisioned using OpenShift Data Foundation are deleted. If there is any PV left in the Released state, delete it. <pv-name> Is the name of the PV Remove the CustomResourceDefinitions . To ensure that OpenShift Data Foundation is uninstalled completely, on the OpenShift Container Platform Web Console, Click Storage . Verify that OpenShift Data Foundation no longer appears under Storage. 4.1.1. Removing local storage operator configurations Use the instructions in this section only if you have deployed OpenShift Data Foundation using local storage devices. Note For OpenShift Data Foundation deployments only using localvolume resources, go directly to step 8. Procedure Identify the LocalVolumeSet and the corresponding StorageClassName being used by OpenShift Data Foundation. Set the variable SC to the StorageClass providing the LocalVolumeSet . List and note the devices to be cleaned up later. Inorder to list the device ids of the disks, please follow the procedure mentioned here, See Find the available storage devices . Example output: Delete the LocalVolumeSet . Delete the local storage PVs for the given StorageClassName . Delete the StorageClassName . Delete the symlinks created by the LocalVolumeSet . Delete LocalVolumeDiscovery . Remove the LocalVolume resources (if any). Use the following steps to remove the LocalVolume resources that were used to provision PVs in the current or OpenShift Data Foundation version. Also, ensure that these resources are not being used by other tenants on the cluster. For each of the local volumes, do the following: Identify the LocalVolume and the corresponding StorageClassName being used by OpenShift Data Foundation. Set the variable LV to the name of the LocalVolume and variable SC to the name of the StorageClass For example: List and note the devices to be cleaned up later. Example output: Delete the local volume resource. Delete the remaining PVs and StorageClasses if they exist. Clean up the artifacts from the storage nodes for that resource. Example output: Wipe the disks for each of the local volumesets or local volumes listed in step 1 and 8 respectively so that they can be reused. List the storage nodes. Example output: Obtain the node console and execute chroot /host command when the prompt appears. Store the disk paths in the DISKS variable within quotes. For the list of disk paths, see step 3 and step 8.c for local volumeset and local volume respectively. Example output: Run sgdisk --zap-all on all the disks. Example output: Exit the shell and repeat for the other nodes. Delete the openshift-local-storage namespace and wait till the deletion is complete. You will need to switch to another project if the openshift-local-storage namespace is the active project. For example: The project is deleted if the following command returns a NotFound error. 4.2. Removing monitoring stack from OpenShift Data Foundation Use this section to clean up the monitoring stack from OpenShift Data Foundation. The Persistent Volume Claims (PVCs) that are created as a part of configuring the monitoring stack are in the openshift-monitoring namespace. Prerequisites PVCs are configured to use OpenShift Container Platform monitoring stack. For more information, see configuring monitoring stack . Procedure List the pods and PVCs that are currently running in the openshift-monitoring namespace. Example output: Edit the monitoring configmap . Remove any config sections that reference the OpenShift Data Foundation storage classes as shown in the following example and save it. Before editing After editing In this example, alertmanagerMain and prometheusK8s monitoring components are using the OpenShift Data Foundation PVCs. Delete the relevant PVCs. Make sure you delete all the PVCs that are consuming the storage classes. <pvc-name> Is the name of the PVC 4.3. Removing OpenShift Container Platform registry from OpenShift Data Foundation Use this section to clean up the OpenShift Container Platform registry from OpenShift Data Foundation. If you want to configure an alternative storage, see Image registry . The Persistent Volume Claims (PVCs) that are created as a part of configuring the OpenShift Container Platform registry are in the openshift-image-registry namespace. Prerequisites The image registry must have been configured to use an OpenShift Data Foundation PVC. Procedure Edit the configs.imageregistry.operator.openshift.io object and remove the content in the storage section. Before editing After editing In this example, the PVC is called registry-cephfs-rwx-pvc , which is now safe to delete. Delete the PVC. <pvc-name> Is the name of the PVC 4.4. Removing the cluster logging operator from OpenShift Data Foundation Use this section to clean up the cluster logging operator from OpenShift Data Foundation. The Persistent Volume Claims (PVCs) that are created as a part of configuring the cluster logging operator are in the openshift-logging namespace. Prerequisites The cluster logging instance should have been configured to use the OpenShift Data Foundation PVCs. Procedure Remove the ClusterLogging instance in the namespace. The PVCs in the openshift-logging namespace are now safe to delete. Delete the PVCs. <pvc-name> Is the name of the PVC

Commands:
oc -n openshift-storage annotate storagecluster ocs-storagecluster uninstall.ocs.openshift.io/cleanup-policy="retain" --overwrite
oc -n openshift-storage annotate storagecluster ocs-storagecluster uninstall.ocs.openshift.io/mode="forced" --overwrite
storagecluster.ocs.openshift.io/ocs-storagecluster annotated
oc get volumesnapshot --all-namespaces
oc delete volumesnapshot <VOLUME-SNAPSHOT-NAME> -n <NAMESPACE>
#!/bin/bash RBD_PROVISIONER="openshift-storage.rbd.csi.ceph.com" CEPHFS_PROVISIONER="openshift-storage.cephfs.csi.ceph.com" NOOBAA_PROVISIONER="openshift-storage.noobaa.io/obc" RGW_PROVISIONER="openshift-storage.ceph.rook.io/bucket" NOOBAA_DB_PVC="noobaa-db" NOOBAA_BACKINGSTORE_PVC="noobaa-default-backing-store-noobaa-pvc" Find all the OCS StorageClasses OCS_STORAGECLASSES=USD(oc get storageclasses | grep -e "USDRBD_PROVISIONER" -e "USDCEPHFS_PROVISIONER" -e "USDNOOBAA_PROVISIONER" -e "USDRGW_PROVISIONER" | awk '{print USD1}') List PVCs in each of the StorageClasses for SC in USDOCS_STORAGECLASSES do echo "======================================================================" echo "USDSC StorageClass PVCs and OBCs" echo "======================================================================" oc get pvc --all-namespaces --no-headers 2>/dev/null | grep USDSC | grep -v -e "USDNOOBAA_DB_PVC" -e "USDNOOBAA_BACKINGSTORE_PVC" oc get obc --all-namespaces --no-headers 2>/dev/null | grep USDSC echo done
oc delete obc <obc-name> -n <project-name>
oc delete pvc <pvc-name> -n <project-name>
oc delete -n openshift-storage storagesystem --all --wait=true
oc get pods -n openshift-storage | grep -i cleanup
NAME READY STATUS RESTARTS AGE cluster-cleanup-job-<xx> 0/1 Completed 0 8m35s cluster-cleanup-job-<yy> 0/1 Completed 0 8m35s cluster-cleanup-job-<zz> 0/1 Completed 0 8m35s
for i in USD(oc get node -l cluster.ocs.openshift.io/openshift-storage= -o jsonpath='{ .items[*].metadata.name }'); do oc debug node/USD{i} -- chroot /host ls -l /var/lib/rook; done
oc debug node/ <node-name>
chroot /host
dmsetup ls
ocs-deviceset-0-data-0-57snx-block-dmcrypt (253:1)
cryptsetup luksClose --debug --verbose ocs-deviceset-0-data-0-57snx-block-dmcrypt
ps -ef | grep crypt
kill -9 <PID>
dmsetup ls
oc project default
oc delete project openshift-storage --wait=true --timeout=5m
oc get project openshift-storage
oc label nodes --all cluster.ocs.openshift.io/openshift-storage-
oc label nodes --all topology.rook.io/rack-
oc adm taint nodes --all node.ocs.openshift.io/storage-
oc get pv
oc delete pv <pv-name>
oc delete crd backingstores.noobaa.io bucketclasses.noobaa.io cephblockpools.ceph.rook.io cephclusters.ceph.rook.io cephfilesystems.ceph.rook.io cephnfses.ceph.rook.io cephobjectstores.ceph.rook.io cephobjectstoreusers.ceph.rook.io noobaas.noobaa.io ocsinitializations.ocs.openshift.io storageclusters.ocs.openshift.io cephclients.ceph.rook.io cephobjectrealms.ceph.rook.io cephobjectzonegroups.ceph.rook.io cephobjectzones.ceph.rook.io cephrbdmirrors.ceph.rook.io storagesystems.odf.openshift.io --wait=true --timeout=5m
oc get localvolumesets.local.storage.openshift.io -n openshift-local-storage
export SC="<StorageClassName>"
/dev/disk/by-id/scsi-360050763808104bc28000000000000eb /dev/disk/by-id/scsi-360050763808104bc28000000000000ef /dev/disk/by-id/scsi-360050763808104bc28000000000000f3
oc delete localvolumesets.local.storage.openshift.io <name-of-volumeset> -n openshift-local-storage
oc get pv | grep USDSC | awk '{print USD1}'| xargs oc delete pv
oc delete sc USDSC
[[ ! -z USDSC ]] && for i in USD(oc get node -l cluster.ocs.openshift.io/openshift-storage= -o jsonpath='{ .items[*].metadata.name }'); do oc debug node/USD{i} -- chroot /host rm -rfv /mnt/local-storage/USD{SC}/; done
oc delete localvolumediscovery.local.storage.openshift.io/auto-discover-devices -n openshift-local-storage
oc get localvolume.local.storage.openshift.io -n openshift-local-storage
LV=local-block SC=localblock
oc get localvolume -n openshift-local-storage USDLV -o jsonpath='{ .spec.storageClassDevices[].devicePaths[] }{"\n"}'
/dev/sdb /dev/sdc /dev/sdd /dev/sde
oc delete localvolume -n openshift-local-storage --wait=true USDLV
oc delete pv -l storage.openshift.com/local-volume-owner-name=USD{LV} --wait --timeout=5m oc delete storageclass USDSC --wait --timeout=5m
[[ ! -z USDSC ]] && for i in USD(oc get node -l cluster.ocs.openshift.io/openshift-storage= -o jsonpath='{ .items[*].metadata.name }'); do oc debug node/USD{i} -- chroot /host rm -rfv /mnt/local-storage/USD{SC}/; done
Starting pod/node-xxx-debug To use host binaries, run `chroot /host` removed '/mnt/local-storage/localblock/nvme2n1' removed directory '/mnt/local-storage/localblock' Removing debug pod Starting pod/node-yyy-debug To use host binaries, run `chroot /host` removed '/mnt/local-storage/localblock/nvme2n1' removed directory '/mnt/local-storage/localblock' Removing debug pod Starting pod/node-zzz-debug To use host binaries, run `chroot /host` removed '/mnt/local-storage/localblock/nvme2n1' removed directory '/mnt/local-storage/localblock' Removing debug pod
get nodes -l cluster.ocs.openshift.io/openshift-storage=
NAME STATUS ROLES AGE VERSION node-xxx Ready worker 4h45m v1.18.3+6c42de8 node-yyy Ready worker 4h46m v1.18.3+6c42de8 node-zzz Ready worker 4h45m v1.18.3+6c42de8
oc debug node/node-xxx Starting pod/node-xxx-debug ... To use host binaries, run `chroot /host` Pod IP: w.x.y.z If you don't see a command prompt, try pressing enter. sh-4.2# chroot /host
sh-4.4# DISKS="/dev/disk/by-id/scsi-360050763808104bc28000000000000eb /dev/disk/by-id/scsi-360050763808104bc28000000000000ef /dev/disk/by-id/scsi-360050763808104bc28000000000000f3 " or sh-4.2# DISKS="/dev/sdb /dev/sdc /dev/sdd /dev/sde ".
sh-4.4# for disk in USDDISKS; do sgdisk --zap-all USDdisk;done
Creating new GPT entries. GPT data structures destroyed! You may now partition the disk using fdisk or other utilities. Creating new GPT entries. GPT data structures destroyed! You may now partition the disk using fdisk or other utilities. Creating new GPT entries. GPT data structures destroyed! You may now partition the disk using fdisk or other utilities. Creating new GPT entries. GPT data structures destroyed! You may now partition the disk using fdisk or other utilities.
sh-4.4# exit exit sh-4.2# exit exit Removing debug pod
oc project default oc delete project openshift-local-storage --wait=true --timeout=5m
oc get project openshift-local-storage
oc get pod,pvc -n openshift-monitoring
NAME READY STATUS RESTARTS AGE pod/alertmanager-main-0 3/3 Running 0 8d pod/alertmanager-main-1 3/3 Running 0 8d pod/alertmanager-main-2 3/3 Running 0 8d pod/cluster-monitoring- operator-84457656d-pkrxm 1/1 Running 0 8d pod/grafana-79ccf6689f-2ll28 2/2 Running 0 8d pod/kube-state-metrics- 7d86fb966-rvd9w 3/3 Running 0 8d pod/node-exporter-25894 2/2 Running 0 8d pod/node-exporter-4dsd7 2/2 Running 0 8d pod/node-exporter-6p4zc 2/2 Running 0 8d pod/node-exporter-jbjvg 2/2 Running 0 8d pod/node-exporter-jj4t5 2/2 Running 0 6d18h pod/node-exporter-k856s 2/2 Running 0 6d18h pod/node-exporter-rf8gn 2/2 Running 0 8d pod/node-exporter-rmb5m 2/2 Running 0 6d18h pod/node-exporter-zj7kx 2/2 Running 0 8d pod/openshift-state-metrics- 59dbd4f654-4clng 3/3 Running 0 8d pod/prometheus-adapter- 5df5865596-k8dzn 1/1 Running 0 7d23h pod/prometheus-adapter- 5df5865596-n2gj9 1/1 Running 0 7d23h pod/prometheus-k8s-0 6/6 Running 1 8d pod/prometheus-k8s-1 6/6 Running 1 8d pod/prometheus-operator- 55cfb858c9-c4zd9 1/1 Running 0 6d21h pod/telemeter-client- 78fc8fc97d-2rgfp 3/3 Running 0 8d NAME STATUS VOLUME CAPACITY ACCESS MODES STORAGECLASS AGE persistentvolumeclaim/my-alertmanager-claim-alertmanager-main-0 Bound pvc-0d519c4f-15a5-11ea-baa0-026d231574aa 40Gi RWO ocs-storagecluster-ceph-rbd 8d persistentvolumeclaim/my-alertmanager-claim-alertmanager-main-1 Bound pvc-0d5a9825-15a5-11ea-baa0-026d231574aa 40Gi RWO ocs-storagecluster-ceph-rbd 8d persistentvolumeclaim/my-alertmanager-claim-alertmanager-main-2 Bound pvc-0d6413dc-15a5-11ea-baa0-026d231574aa 40Gi RWO ocs-storagecluster-ceph-rbd 8d persistentvolumeclaim/my-prometheus-claim-prometheus-k8s-0 Bound pvc-0b7c19b0-15a5-11ea-baa0-026d231574aa 40Gi RWO ocs-storagecluster-ceph-rbd 8d persistentvolumeclaim/my-prometheus-claim-prometheus-k8s-1 Bound pvc-0b8aed3f-15a5-11ea-baa0-026d231574aa 40Gi RWO ocs-storagecluster-ceph-rbd 8d
oc -n openshift-monitoring edit configmap cluster-monitoring-config
. . . apiVersion: v1 data: config.yaml: | alertmanagerMain: volumeClaimTemplate: metadata: name: my-alertmanager-claim spec: resources: requests: storage: 40Gi storageClassName: ocs-storagecluster-ceph-rbd prometheusK8s: volumeClaimTemplate: metadata: name: my-prometheus-claim spec: resources: requests: storage: 40Gi storageClassName: ocs-storagecluster-ceph-rbd kind: ConfigMap metadata: creationTimestamp: "2019-12-02T07:47:29Z" name: cluster-monitoring-config namespace: openshift-monitoring resourceVersion: "22110" selfLink: /api/v1/namespaces/openshift-monitoring/configmaps/cluster-monitoring-config uid: fd6d988b-14d7-11ea-84ff-066035b9efa8 . . .
. . . apiVersion: v1 data: config.yaml: | kind: ConfigMap metadata: creationTimestamp: "2019-11-21T13:07:05Z" name: cluster-monitoring-config namespace: openshift-monitoring resourceVersion: "404352" selfLink: /api/v1/namespaces/openshift-monitoring/configmaps/cluster-monitoring-config uid: d12c796a-0c5f-11ea-9832-063cd735b81c . . .
oc delete -n openshift-monitoring pvc <pvc-name> --wait=true --timeout=5m
oc edit configs.imageregistry.operator.openshift.io
. . . storage: pvc: claim: registry-cephfs-rwx-pvc . . .
. . . storage: emptyDir: {} . . .
oc delete pvc <pvc-name> -n openshift-image-registry --wait=true --timeout=5m
oc delete clusterlogging instance -n openshift-logging --wait=true --timeout=5m
oc delete pvc <pvc-name> -n openshift-logging --wait=true --timeout=5m