Chapter 4. Uninstalling OpenShift Data Foundation from external storage system Use the steps in this section to uninstall OpenShift Data Foundation. Uninstalling OpenShift Data Foundation does not remove the RBD pool from the external cluster, or uninstall the external Red Hat Ceph Storage cluster. 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 Note The uninstall.ocs.openshift.io/cleanup-policy is not applicable for external mode. The below 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 PVCs and the OBCs are removed by the administrator/user mode forced No Rook and NooBaa proceeds with uninstall even if PVCs/OBCs provisioned using Rook and NooBaa exist respectively You can change the uninstall mode by editing the value of the annotation by using the following 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. 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. 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 wish to delete the Storage Cluster without deleting the PVCs beforehand, you may set the uninstall mode annotation to "forced" and skip this step. Doing so will result 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 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 and OBCs that are used internally by OpenShift Data Foundation. Delete the OBCs. Delete the PVCs. Ensure that you have removed any custom backing stores, bucket classes, and so on that are created in the cluster. Delete the Storage Cluster object and wait for the removal of the associated resources. Delete the namespace and wait until the deletion is complete. You will 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 the 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. Confirm all PVs provisioned using OpenShift Data Foundation are deleted. If there is any PV left in the Released state, delete it. Remove CustomResourceDefinitions . To ensure that OpenShift Data Foundation is uninstalled completely: In the OpenShift Container Platform Web Console, click Storage . Verify that OpenShift Data Foundation no longer appears under Storage. 4.1. Removing monitoring stack from OpenShift Data Foundation Use this section to clean up the monitoring stack from OpenShift Data Foundation. The PVCs that are created as a part of configuring the monitoring stack are in the openshift-monitoring namespace. Prerequisites PVCs are configured to use the OpenShift Container Platform monitoring stack. For information, see configuring monitoring stack . Procedure List the pods and PVCs that are currently running in the openshift-monitoring namespace. 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. List the pods consuming the PVC. In this example, the alertmanagerMain and prometheusK8s pods that were consuming the PVCs are in the Terminating state. You can delete the PVCs once these pods are no longer using OpenShift Data Foundation PVC. Delete relevant PVCs. Make sure you delete all the PVCs that are consuming the storage classes. 4.2. 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 PVCs that are created as a part of configuring OpenShift Container Platform registry are in the openshift-image-registry namespace. Prerequisites The image registry should 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. 4.3. 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 4.4. Removing external IBM FlashSystem secret You need to clean up the FlashSystem secret from OpenShift Data Foundation while uninstalling. This secret is created when you configure the external IBM FlashSystem Storage. For more information, see Creating an OpenShift Data Foundation Cluster for external IBM FlashSystem storage . Procedure Remove the IBM FlashSystem secret by using the following command:

Commands:
oc annotate storagecluster ocs-external-storagecluster -n openshift-storage uninstall.ocs.openshift.io/mode="forced" --overwrite storagecluster.ocs.openshift.io/ocs-external-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 project default oc delete project openshift-storage --wait=true --timeout=5m
oc get project openshift-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 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-external-storagecluster-ceph-rbd 8d persistentvolumeclaim/my-alertmanager-claim-alertmanager-main-1 Bound pvc-0d5a9825-15a5-11ea-baa0-026d231574aa 40Gi RWO ocs-external-storagecluster-ceph-rbd 8d persistentvolumeclaim/my-alertmanager-claim-alertmanager-main-2 Bound pvc-0d6413dc-15a5-11ea-baa0-026d231574aa 40Gi RWO ocs-external-storagecluster-ceph-rbd 8d persistentvolumeclaim/my-prometheus-claim-prometheus-k8s-0 Bound pvc-0b7c19b0-15a5-11ea-baa0-026d231574aa 40Gi RWO ocs-external-storagecluster-ceph-rbd 8d persistentvolumeclaim/my-prometheus-claim-prometheus-k8s-1 Bound pvc-0b8aed3f-15a5-11ea-baa0-026d231574aa 40Gi RWO ocs-external-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-external-storagecluster-ceph-rbd prometheusK8s: volumeClaimTemplate: metadata: name: my-prometheus-claim spec: resources: requests: storage: 40Gi storageClassName: ocs-external-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 get pod,pvc -n openshift-monitoring NAME READY STATUS RESTARTS AGE pod/alertmanager-main-0 3/3 Terminating 0 10h pod/alertmanager-main-1 3/3 Terminating 0 10h pod/alertmanager-main-2 3/3 Terminating 0 10h pod/cluster-monitoring-operator-84cd9df668-zhjfn 1/1 Running 0 18h pod/grafana-5db6fd97f8-pmtbf 2/2 Running 0 10h pod/kube-state-metrics-895899678-z2r9q 3/3 Running 0 10h pod/node-exporter-4njxv 2/2 Running 0 18h pod/node-exporter-b8ckz 2/2 Running 0 11h pod/node-exporter-c2vp5 2/2 Running 0 18h pod/node-exporter-cq65n 2/2 Running 0 18h pod/node-exporter-f5sm7 2/2 Running 0 11h pod/node-exporter-f852c 2/2 Running 0 18h pod/node-exporter-l9zn7 2/2 Running 0 11h pod/node-exporter-ngbs8 2/2 Running 0 18h pod/node-exporter-rv4v9 2/2 Running 0 18h pod/openshift-state-metrics-77d5f699d8-69q5x 3/3 Running 0 10h pod/prometheus-adapter-765465b56-4tbxx 1/1 Running 0 10h pod/prometheus-adapter-765465b56-s2qg2 1/1 Running 0 10h pod/prometheus-k8s-0 6/6 Terminating 1 9m47s pod/prometheus-k8s-1 6/6 Terminating 1 9m47s pod/prometheus-operator-cbfd89f9-ldnwc 1/1 Running 0 43m pod/telemeter-client-7b5ddb4489-2xfpz 3/3 Running 0 10h NAME STATUS VOLUME CAPACITY ACCESS MODES STORAGECLASS AGE persistentvolumeclaim/ocs-alertmanager-claim-alertmanager-main-0 Bound pvc-2eb79797-1fed-11ea-93e1-0a88476a6a64 40Gi RWO ocs-external-storagecluster-ceph-rbd 19h persistentvolumeclaim/ocs-alertmanager-claim-alertmanager-main-1 Bound pvc-2ebeee54-1fed-11ea-93e1-0a88476a6a64 40Gi RWO ocs-external-storagecluster-ceph-rbd 19h persistentvolumeclaim/ocs-alertmanager-claim-alertmanager-main-2 Bound pvc-2ec6a9cf-1fed-11ea-93e1-0a88476a6a64 40Gi RWO ocs-external-storagecluster-ceph-rbd 19h persistentvolumeclaim/ocs-prometheus-claim-prometheus-k8s-0 Bound pvc-3162a80c-1fed-11ea-93e1-0a88476a6a64 40Gi RWO ocs-external-storagecluster-ceph-rbd 19h persistentvolumeclaim/ocs-prometheus-claim-prometheus-k8s-1 Bound pvc-316e99e2-1fed-11ea-93e1-0a88476a6a64 40Gi RWO ocs-external-storagecluster-ceph-rbd 19h
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
oc delete secret -n openshift-storage ibm-flashsystem-storage