Deploying OpenShift Container Storage using Red Hat Virtualization platform

Red Hat OpenShift Container Storage 4.8

How to install

Red Hat Storage Documentation Team

Abstract

Read this document for instructions on installing Red Hat OpenShift Container Storage using Red Hat Virtualization platform.

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Preface

Red Hat OpenShift Container Storage 4.8 supports deployment on existing Red Hat OpenShift Container Platform (RHOCP) Red Hat Virtualization platform clusters.

Deploying OpenShift Container Storage on OpenShift Container Platform using shared storage devices provided by Red Hat Virtualization installer-provisioned infrastructure (IPI) enables you to create internal cluster resources.

Note

Only internal Openshift Container Storage clusters are supported on Red Hat Virtualization platform. See Planning your deployment for more information about deployment requirements.

Based on your requirement, perform one of the following methods of deployment:

Chapter 1. Preparing to deploy OpenShift Container Storage using Red Hat Virtualization platform

Before you begin the deployment of Red Hat OpenShift Container Storage using dynamic or local storage, ensure that your resource requirements are met. See Planning your deployment.

  1. On the external key management system (KMS),

  2. Minimum starting node requirements [Technology Preview]

    An OpenShift Container Storage cluster will be deployed with minimum configuration when the standard deployment resource requirement is not met. See Resource requirements section in Planning guide.

  3. Ensure that the requirements for installing OpenShift Container Storage using local storage devices are met.

1.1. Enabling key value backend path and policy in Vault

Prerequisites

  • Administrator access to Vault.
  • Choose a unique path name as the backend path that follows the naming convention since it cannot be changed later.

Procedure

  1. Enable the Key/Value (KV) backend path in Vault.

    For Vault KV secret engine API, version 1:

    $ vault secrets enable -path=ocs kv

    For Vault KV secret engine API, version 2:

    $ vault secrets enable -path=ocs kv-v2
  2. Create a policy to restrict users to perform a write or delete operation on the secret using the following commands:

    echo '
    path "ocs/*" {
      capabilities = ["create", "read", "update", "delete", "list"]
    }
    path "sys/mounts" {
    capabilities = ["read"]
    }'| vault policy write ocs -
  3. Create a token matching the above policy:

    $ vault token create -policy=ocs -format json

1.2. Requirements for installing OpenShift Container Storage using local storage devices

Node requirements

The cluster must consist of at least three OpenShift Container Platform worker nodes with locally attached-storage devices on each of them.

  • Each of the three selected nodes must have at least one raw block device available to be used by OpenShift Container Storage.
  • The devices you use must be empty; the disks must not include physical volumes (PVs), volume groups (VGs), or logical volumes (LVs) remaining on the disk.

For more information, see the Resource requirements section in the Planning guide.

Arbiter stretch cluster requirements [Technology Preview]

In this case, a single cluster is stretched across two zones with a third zone as the location for the arbiter. This is a technology preview feature that is currently intended for deployment in the OpenShift Container Platform on-premises.

For detailed requirements and instructions, see Configuring OpenShift Container Storage for Metro-DR stretch cluster.

Note

You cannot enable both flexible scaling and arbiter as they have conflicting scaling logic. With flexing scaling, you can add one node at a time to the OpenShift Container Storage cluster. Whereas, in an arbiter cluster, you need to add at least one node in each of the 2 data zones.

Minimum starting node requirements [Technology Preview]

An OpenShift Container Storage cluster is deployed with minimum configuration when the standard deployment resource requirement is not met.

For more information, see Resource requirements section in the Planning guide.

Chapter 2. Deploy using dynamic storage devices

Deploying OpenShift Container Storage on OpenShift Container Platform using dynamic storage devices provided by Red Hat Virtualization gives you the option to create internal cluster resources. This results in the internal provisioning of the base services, which helps to make additional storage classes available to applications.

Ensure that you have addressed the requirements in Preparing to deploy OpenShift Container Storage chapter before proceeding with the below steps for deploying using dynamic storage devices:

2.1. Installing Red Hat OpenShift Container Storage Operator

You can install Red Hat OpenShift Container Storage Operator using the Red Hat OpenShift Container Platform Operator Hub.

Prerequisites

  • Access to an OpenShift Container Platform cluster using an account with cluster-admin and operator installation permissions.
  • You have at least three worker nodes in the Red Hat OpenShift Container Platform cluster.
  • You have satisfied any additional requirements required. For more information, see Planning your deployment.
Note
  • When you need to override the cluster-wide default node selector for OpenShift Container Storage, you can use the following command to specify a blank node selector for the openshift-storage namespace (create openshift-storage namespace in this case):

    $ oc annotate namespace openshift-storage openshift.io/node-selector=
  • Taint a node as infra to ensure only Red Hat OpenShift Container Storage resources are scheduled on that node. This helps you save on subscription costs. For more information, see How to use dedicated worker nodes for Red Hat OpenShift Container Storage chapter in Managing and Allocating Storage Resources guide.

Procedure

  1. Log in to OpenShift Web Console.
  2. Click OperatorsOperatorHub.
  3. Search for OpenShift Container Storage from the list of operators and click on it.
  4. Click Install.
  5. Set the following options on the Install Operator page:

    1. Channel as stable-4.8.
    2. Installation Mode as A specific namespace on the cluster.
    3. Installed Namespace as Operator recommended namespace openshift-storage. If Namespace openshift-storage does not exist, it will be created during the operator installation.
    4. Approval Strategy as Automatic or Manual.
    5. Click Install.

      If you select Automatic updates, the Operator Lifecycle Manager (OLM) automatically upgrades the running instance of your operator without any intervention.

      If you select Manual updates, the OLM creates an update request. As a cluster administrator, you must then manually approve that update request to have the operator updated to the new version.

Verification step

  • Verify that the OpenShift Container Storage Operator shows a green tick indicating successful installation.

2.2. Creating an OpenShift Container Storage Cluster Service in internal mode

Use this procedure to create an OpenShift Container Storage Cluster Service after you install the OpenShift Container Storage operator.

Prerequisites

Procedure

  1. Log into the OpenShift Web Console.
  2. Click Operators → Installed Operators to view all the installed operators.

    Ensure that the Project selected is openshift-storage.

  3. Click OpenShift Container Storage > Create Instance link of Storage Cluster.
  4. Select Mode is set to Internal by default.
  5. Select Capacity and nodes

    1. Select Requested Capacity from the drop down list. It is set to 2 TiB by default. You can use the drop down to modify the capacity value.

      Note

      Once you select the initial storage capacity, cluster expansion is performed only using the selected usable capacity (3 times of raw storage).

    2. In the Select Nodes section, select at least three available nodes.
    3. Click Next.
  6. (Optional) Set Security and network configuration

    1. Select the Enable encryption checkbox to encrypt block and file storage.
    2. Choose any one or both Encryption level:

      • Cluster-wide encryption to encrypt the entire cluster (block and file).
      • Storage class encryption to create encrypted persistent volume (block only) using encryption enabled storage class.
    3. Select the Connect to an external key management service checkbox. This is optional for cluster-wide encryption.

      1. Key Management Service Provider is set to Vault by default.
      2. Enter Vault Service Name, host Address of Vault server ('https://<hostname or ip>'), Port number and Token.
      3. Expand Advanced Settings to enter additional settings and certificate details based on your Vault configuration:

        1. Enter the Key Value secret path in Backend Path that is dedicated and unique to OpenShift Container Storage.
        2. (Optional) Enter TLS Server Name and Vault Enterprise Namespace.
        3. Provide CA Certificate, Client Certificate and Client Private Key by uploading the respective PEM encoded certificate file.
        4. Click Save.
  7. Select Default (SDN) if you are using a single network or Custom (Multus) Network if you plan on using multiple network interfaces.

    1. Select a Public Network Interface from drop down.
    2. Select a Cluster Network Interface from drop down.

      Note

      If only using one additional network interface select the single NetworkAttachementDefinition (i.e. ocs-public-cluster) for the Public Network Interface and leave the Cluster Network Interface blank.

  8. Click Next.
  9. Review the configuration details. To modify any configuration settings, click Back to go back to the previous configuration page.
  10. Click Create.
  11. Edit the configmap if Vault Key/Value (KV) secret engine API, version 2 is used for cluster-wide encryption with Key Management System (KMS).

    1. On the OpenShift Web Console, navigate to Workloads → ConfigMaps.
    2. To view the KMS connection details, click ocs-kms-connection-details.
    3. Edit the configmap.

      1. Click Action menu (⋮) → Edit ConfigMap.
      2. Set the VAULT_BACKEND parameter to v2.

        kind: ConfigMap
        apiVersion: v1
        metadata:
          name: ocs-kms-connection-details
        [...]
        data:
          KMS_PROVIDER: vault
          KMS_SERVICE_NAME: vault
        [...]
          VAULT_BACKEND: v2
        [...]
      3. Click Save.

Verification steps

  1. On the storage cluster details page, the storage cluster name displays a green tick next to it to indicate that the cluster was created successfully.
  2. Verify that the final Status of the installed storage cluster shows as Phase: Ready with a green tick mark.

    • Click Operators → Installed Operators → Storage Cluster link to view the storage cluster installation status.
    • Alternatively, when you are on the Operator Details tab, you can click on the Storage Cluster tab to view the status.

Chapter 3. Deploy using local storage devices

Deploying OpenShift Container Storage on OpenShift Container Platform using local storage devices provides you with the option to create internal cluster resources. This results in the internal provisioning of the base services, which helps to make additional storage classes available to applications.

Use this section to deploy OpenShift Container Storage on Red Hat Virtualization where OpenShift Container Platform is already installed.

Also, ensure that you have addressed the requirements in Preparing to deploy OpenShift Container Storage chapter before proceeding with the next steps.

3.1. Installing Local Storage Operator

You can install the Local Storage Operator using the Red Hat OpenShift Container Platform Operator Hub.

Prerequisite

  • Access to an OpenShift Container Platform cluster using an account with cluster-admin and Operator installation permissions.

Procedure

  1. Log in to the OpenShift Web Console.
  2. Click Operators → OperatorHub.
  3. Type local storage in the Filter by keyword…​ box to search for Local Storage operator from the list of operators and click on it.
  4. Click Install.
  5. Set the following options on the Install Operator page:

    1. Channel as stable-4.8.
    2. Installation Mode as A specific namespace on the cluster.
    3. Installed Namespace as Operator recommended namespace openshift-local-storage.
    4. Approval Strategy as Automatic.
  6. Click Install.

Verification step

  • Verify that the Local Storage Operator shows the Status as Succeeded.

3.2. Installing Red Hat OpenShift Container Storage Operator

You can install Red Hat OpenShift Container Storage Operator using the Red Hat OpenShift Container Platform Operator Hub.

Prerequisites

  • Access to an OpenShift Container Platform cluster using an account with cluster-admin and operator installation permissions.
  • You have at least three worker nodes in the Red Hat OpenShift Container Platform cluster.
  • You have satisfied any additional requirements required. For more information, see Planning your deployment.
Note
  • When you need to override the cluster-wide default node selector for OpenShift Container Storage, you can use the following command to specify a blank node selector for the openshift-storage namespace (create openshift-storage namespace in this case):

    $ oc annotate namespace openshift-storage openshift.io/node-selector=
  • Taint a node as infra to ensure only Red Hat OpenShift Container Storage resources are scheduled on that node. This helps you save on subscription costs. For more information, see How to use dedicated worker nodes for Red Hat OpenShift Container Storage chapter in Managing and Allocating Storage Resources guide.

Procedure

  1. Log in to OpenShift Web Console.
  2. Click OperatorsOperatorHub.
  3. Search for OpenShift Container Storage from the list of operators and click on it.
  4. Click Install.
  5. Set the following options on the Install Operator page:

    1. Channel as stable-4.8.
    2. Installation Mode as A specific namespace on the cluster.
    3. Installed Namespace as Operator recommended namespace openshift-storage. If Namespace openshift-storage does not exist, it will be created during the operator installation.
    4. Approval Strategy as Automatic or Manual.
    5. Click Install.

      If you select Automatic updates, the Operator Lifecycle Manager (OLM) automatically upgrades the running instance of your operator without any intervention.

      If you select Manual updates, the OLM creates an update request. As a cluster administrator, you must then manually approve that update request to have the operator updated to the new version.

Verification step

  • Verify that the OpenShift Container Storage Operator shows a green tick indicating successful installation.

3.3. Creating OpenShift Container Storage cluster on Red Hat Virtualization platform

Use this procedure to create an OpenShift Container Storage Cluster Service using local storage devices after you install the OpenShift Container Storage operator.

Prerequisites

Procedure

  1. Log into the OpenShift Web Console.
  2. Click Operators → Installed Operators to view all the installed operators.

    Ensure that the Project selected is openshift-storage.

  3. Click OpenShift Container StorageCreate Instance link of Storage Cluster.
  4. Choose Select Mode as Internal-Attached devices.

    Note

    You are prompted to install the Local Storage Operator if it is not already installed. Click Install and follows procedure as described in Installing Local Storage Operator.

  5. Discover disks

    1. Choose one of the following:

      • All nodes to discover disks in all the nodes.
      • Select nodes to discover disks from a subset of available nodes.

        Important

        For using arbiter mode, do not select the All nodes option. Instead, use the Select nodes option to select the labeled nodes with attached storage device(s) from the two data-center zones.

        Note

        If the nodes to be selected are tainted and not discovered in the wizard, follow the steps provided in the Red Hat Knowledgebase Solution as a workaround to add tolerations for Local Storage Operator resources.

        If the nodes selected do not match the OpenShift Container Storage cluster requirement of an aggregated 30 CPUs and 72 GiB of RAM, a minimal cluster will be deployed. For minimum starting node requirements, see Resource requirements section in Planning guide.

    2. Click Next.
  6. Create Storage class.

    You can create a dedicated storage class to consume storage by filtering a set of storage volumes.

    1. Enter the Local Volume Set Name.
    2. Enter the Storage Class Name. By default, the volume set name appears for the storage class name. You can also change the name.
    3. The nodes selected for disk discovery in the previous step are displayed in the Filter Disks By section. Choose one of the following:

      • Disks on all nodes to select all the nodes for which you discovered the devices.
      • Disks on selected nodes to select a subset of the nodes for which you discovered the devices. Spread the worker nodes across three different physical nodes, racks or failure domains for high availability.

        Important

        The flexible scaling feature gets enabled on creating a storage cluster with 3 or more nodes spread across fewer than the minimum requirement of 3 availability zones. This feature is available only for the new deployments of OpenShift Container Storage 4.7 clusters and does not support the upgraded clusters. For information about flexible scaling, see Scaling Storage Guide.

    4. Select SSD/NVME Disk Type from the available list.
    5. Expand the Advanced section and set the following options:

      Volume Mode

      Block is selected by default.

      Device Type

      Select one or more disk type from the drop down list.

      Disk Size

      Set a minimum size of 100GB for the device and maximum available size of the device that needs to be included.

      Maximum Disk Limit

      This indicates the maximum number of PVs that can be created on a node. If this field is left empty, then PVs are created for all the available disks on the matching nodes.

    6. Click Next. A pop-up to confirm creation of the new storage class is displayed.
    7. Click Yes to continue.
  7. Set Capacity and nodes

    1. Select Storage Class. By default, the new storage class created in the previous step is selected.
    2. Selected Nodes shows the nodes selected in the previous step. This list takes a few minutes to reflect the disks that were discovered in the previous step.
    3. Click Next.
  8. (Optional) Set Security and network configuration

    1. Select Enable encryption checkbox to encrypt block and file storage.
    2. Choose one of the following Encryption level:

      • Cluster-wide encryption to encrypt the entire cluster (block and file).
      • Storage class encryption to create encrypted persistent volume (block only) using encryption enabled storage class.
    3. Select Connect to an external key management service checkbox. This is optional for cluster-wide encryption.

      1. Key Management Service Provider is set to Vault by default.
      2. Enter Vault Service Name, host Address of Vault server ('https://<hostname or ip>'), Port number and Token.
      3. Expand Advanced Settings to enter additional settings and certificate details based on your Vault configuration:

        1. Enter the Key Value secret path in Backend Path that is dedicated and unique to OpenShift Container Storage.
        2. (Optional) Enter TLS Server Name and Vault Enterprise Namespace.
        3. Provide CA Certificate, Client Certificate and Client Private Key by uploading the respective PEM encoded certificate file.
        4. Click Save.
  9. Select Default (SDN) if you are using a single network or Custom (Multus) Network if you plan on using multiple network interfaces.

    1. Select a Public Network Interface from drop down.
    2. Select a Cluster Network Interface from drop down.
  10. Click Next.
  11. Review the configuration details. To modify any configuration settings, click Back to go back to the previous configuration page.
  12. Click Create.
  13. Edit the configmap if Vault Key/Value (KV) secret engine API, version 2 is used for cluster-wide encryption with Key Management System (KMS).

    1. On the OpenShift Web Console, navigate to Workloads → ConfigMaps.
    2. To view the KMS connection details, click ocs-kms-connection-details.
    3. Edit the configmap.

      1. Click Action menu (⋮) → Edit ConfigMap.
      2. Set the VAULT_BACKEND parameter to v2.

        kind: ConfigMap
        apiVersion: v1
        metadata:
          name: ocs-kms-connection-details
        [...]
        data:
          KMS_PROVIDER: vault
          KMS_SERVICE_NAME: vault
        [...]
          VAULT_BACKEND: v2
        [...]
      3. Click Save.

Verification steps

  • Verify that the final Status of the installed storage cluster shows as Phase: Ready with a green tick mark.

    • Click OperatorsInstalled OperatorsStorage Cluster link to view the storage cluster installation status.
    • Alternatively, when you are on the Operator Details tab, you can click on the Storage Cluster tab to view the status.
  • To verify if flexible scaling is enabled on your storage cluster, perform the following steps (for arbiter mode, flexible scaling is disabled):

    1. Click ocs-storagecluster in Storage Cluster tab.
    2. In the YAML tab, search for the keys flexibleScaling in spec section and failureDomain in status section. If flexible scaling is true and failureDomain is set to host, flexible scaling feature is enabled.

      spec:
      flexibleScaling: true
      […]
      status:
      failureDomain: host
  • To verify that all components for OpenShift Container Storage are successfully installed, see Verifying your OpenShift Container Storage installation.

Additional resources

Chapter 4. Verifying OpenShift Container Storage deployment

Use this section to verify that OpenShift Container Storage is deployed correctly.

4.1. Verifying the state of the pods

To verify that the pods of OpenShift Containers Storage are in running state, follow the below procedure:

Procedure

  1. Log in to OpenShift Web Console.
  2. Click Workloads → Pods from the left pane of the OpenShift Web Console.
  3. Select openshift-storage from the Project drop down list.

    For more information on the expected number of pods for each component and how it varies depending on the number of nodes, see Table 4.1, “Pods corresponding to OpenShift Container storage cluster”.

  4. Click on the Running and Completed tabs to verify that the pods are running and in a completed state:

    Table 4.1. Pods corresponding to OpenShift Container storage cluster

    ComponentCorresponding pods

    OpenShift Container Storage Operator

    • ocs-operator-* (1 pod on any worker node)
    • ocs-metrics-exporter-*

    Rook-ceph Operator

    rook-ceph-operator-*

    (1 pod on any worker node)

    Multicloud Object Gateway

    • noobaa-operator-* (1 pod on any worker node)
    • noobaa-core-* (1 pod on any storage node)
    • nooba-db-* (1 pod on any storage node)
    • noobaa-endpoint-* (1 pod on any storage node)

    MON

    rook-ceph-mon-*

    (3 pods distributed across storage nodes)

    MGR

    rook-ceph-mgr-*

    (1 pod on any storage node)

    MDS

    rook-ceph-mds-ocs-storagecluster-cephfilesystem-*

    (2 pods distributed across storage nodes)

    RGW

    rook-ceph-rgw-ocs-storagecluster-cephobjectstore-* (1 pod on any storage node)

    CSI

    • cephfs

      • csi-cephfsplugin-* (1 pod on each worker node)
      • csi-cephfsplugin-provisioner-* (2 pods distributed across storage nodes)
    • rbd

      • csi-rbdplugin-* (1 pod on each worker node)
      • csi-rbdplugin-provisioner-* (2 pods distributed across storage nodes)

    rook-ceph-crashcollector

    rook-ceph-crashcollector-*

    (1 pod on each storage node)

    OSD

    • rook-ceph-osd-* (1 pod for each device)
    • rook-ceph-osd-prepare-ocs-deviceset-* (1 pod for each device)

4.2. Verifying the OpenShift Container Storage cluster is healthy

To verify that the cluster of OpenShift Container Storage is healthy, follow the steps in the procedure.

Procedure

  1. Click Storage → Overview and click the Block and File tab.
  2. In the Status card, verify that Storage Cluster and Data Resiliency has a green tick mark.
  3. In the Details card, verify that the cluster information is displayed.

For more information on the health of the OpenShift Container Storage clusters using the Block and File dashboard, see Monitoring OpenShift Container Storage.

4.3. Verifying the Multicloud Object Gateway is healthy

To verify that the OpenShift Container Storage Multicloud Object Gateway is healthy, follow the steps in the procedure.

Procedure

  1. Click Storage → Overview from the OpenShift Web Console and click the Object tab.
  2. In the Status card, verify that both Object Service and Data Resiliency are in Ready state (green tick).
  3. In the Details card, verify that the Multicloud Object Gateway information is displayed.

For more information on the health of the OpenShift Container Storage cluster using the object service dashboard, see Monitoring OpenShift Container Storage.

4.4. Verifying that the OpenShift Container Storage specific storage classes exist

To verify the storage classes exists in the cluster, follow the steps in the procedure.

Procedure

  1. Click Storage → Storage Classes from the OpenShift Web Console.
  2. Verify that the following storage classes are created with the OpenShift Container Storage cluster creation:

    • ocs-storagecluster-ceph-rbd
    • ocs-storagecluster-cephfs
    • openshift-storage.noobaa.io
    • ocs-storagecluster-ceph-rgw

Chapter 5. Uninstalling OpenShift Container Storage

5.1. Uninstalling OpenShift Container Storage in Internal mode

Use the steps in this section to uninstall OpenShift Container Storage.

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 below table provides information on the different values that can used with these annotations:

Table 5.1. uninstall.ocs.openshift.io uninstall annotations descriptions

AnnotationValueDefaultBehavior

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 cleanup policy or the uninstall mode by editing the value of the annotation by using the following commands:

$ oc annotate storagecluster ocs-storagecluster uninstall.ocs.openshift.io/cleanup-policy="retain" --overwrite
storagecluster.ocs.openshift.io/ocs-storagecluster annotated
$ oc annotate storagecluster ocs-storagecluster uninstall.ocs.openshift.io/mode="forced" --overwrite
storagecluster.ocs.openshift.io/ocs-storagecluster annotated

Prerequisites

  • Ensure that the OpenShift Container Storage 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 Container Storage.
  • Ensure that applications are not consuming persistent volume claims (PVCs) or object bucket claims (OBCs) using the storage classes provided by OpenShift Container Storage.
  • 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

  1. Delete the volume snapshots that are using OpenShift Container Storage.

    1. List the volume snapshots from all the namespaces.

      $ oc get volumesnapshot --all-namespaces
    2. From the output of the previous command, identify and delete the volume snapshots that are using OpenShift Container Storage.

      $ oc delete volumesnapshot <VOLUME-SNAPSHOT-NAME> -n <NAMESPACE>
  2. Delete PVCs and OBCs that are using OpenShift Container Storage.

    In the default uninstall mode (graceful), the uninstaller waits till all the PVCs and OBCs that use OpenShift Container Storage 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 this results in orphan PVCs and OBCs in the system.

    1. Delete OpenShift Container Platform monitoring stack PVCs using OpenShift Container Storage.

      For more information, see Section 5.2, “Removing monitoring stack from OpenShift Container Storage”.

    2. Delete OpenShift Container Platform Registry PVCs using OpenShift Container Storage.

      For more information, see Section 5.3, “Removing OpenShift Container Platform registry from OpenShift Container Storage”.

    3. Delete OpenShift Container Platform logging PVCs using OpenShift Container Storage.

      For more information, see Section 5.4, “Removing the cluster logging operator from OpenShift Container Storage”.

    4. Delete other PVCs and OBCs provisioned using OpenShift Container Storage.

      • Following script is sample script to identify the PVCs and OBCs provisioned using OpenShift Container Storage. The script ignores the PVCs that are used internally by Openshift Container Storage.

        #!/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=$(oc get storageclasses | grep -e "$RBD_PROVISIONER" -e "$CEPHFS_PROVISIONER" -e "$NOOBAA_PROVISIONER" -e "$RGW_PROVISIONER" | awk '{print $1}')
        
        # List PVCs in each of the StorageClasses
        for SC in $OCS_STORAGECLASSES
        do
                echo "======================================================================"
                echo "$SC StorageClass PVCs and OBCs"
                echo "======================================================================"
                oc get pvc  --all-namespaces --no-headers 2>/dev/null | grep $SC | grep -v -e "$NOOBAA_DB_PVC" -e "$NOOBAA_BACKINGSTORE_PVC"
                oc get obc  --all-namespaces --no-headers 2>/dev/null | grep $SC
                echo
        done
        Note

        Omit RGW_PROVISIONER for cloud platforms.

      • Delete the OBCs.

        $ oc delete obc <obc name> -n <project name>
      • Delete the PVCs.

        $ oc delete pvc <pvc name> -n <project-name>
        Note

        Ensure that you have removed any custom backing stores, bucket classes, etc., created in the cluster.

  3. Delete the Storage Cluster object and wait for the removal of the associated resources.

    $ oc delete -n openshift-storage storagecluster --all --wait=true
  4. Check for cleanup pods if the uninstall.ocs.openshift.io/cleanup-policy was set to delete(default) and ensure that their status is Completed.

    $ 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
  5. Confirm that the directory /var/lib/rook is now empty. This directory will be empty only if the uninstall.ocs.openshift.io/cleanup-policy annotation was set to delete(default).

    $ for i in $(oc get node -l cluster.ocs.openshift.io/openshift-storage= -o jsonpath='{ .items[*].metadata.name }'); do oc debug node/${i} -- chroot /host  ls -l /var/lib/rook; done
  6. If encryption was enabled at the time of install, remove dm-crypt managed device-mapper mapping from OSD devices on all the OpenShift Container Storage nodes.

    1. Create a debug pod and chroot to the host on the storage node.

      $ oc debug node/<node name>
      $ chroot /host
    2. Get Device names and make note of the OpenShift Container Storage devices.

      $ dmsetup ls
      ocs-deviceset-0-data-0-57snx-block-dmcrypt (253:1)
    3. Remove the mapped device.

      $ cryptsetup luksClose --debug --verbose ocs-deviceset-0-data-0-57snx-block-dmcrypt
      Note

      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.

        $ ps -ef | grep crypt
      • Terminate the process using kill command.

        $ kill -9 <PID>
      • Verify that the device name is removed.

        $ dmsetup ls
  7. 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:

    $ oc project default
    $ oc delete project openshift-storage --wait=true --timeout=5m

    The project is deleted if the following command returns a NotFound error.

    $ oc get project openshift-storage
    Note

    While uninstalling OpenShift Container Storage, 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.

  8. Delete the local storage operator configurations if you have deployed OpenShift Container Storage using local storage devices. See Removing local storage operator configurations.
  9. Unlabel the storage nodes.

    $ oc label nodes  --all cluster.ocs.openshift.io/openshift-storage-
    $ oc label nodes  --all topology.rook.io/rack-
  10. Remove the OpenShift Container Storage taint if the nodes were tainted.

    $ oc adm taint nodes --all node.ocs.openshift.io/storage-
  11. Confirm all PVs provisioned using OpenShift Container Storage are deleted. If there is any PV left in the Released state, delete it.

    $ oc get pv
    $ oc delete pv <pv name>
  12. Delete the Multicloud Object Gateway storageclass.

    $ oc delete storageclass openshift-storage.noobaa.io --wait=true --timeout=5m
  13. Remove CustomResourceDefinitions.

    $ 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 --wait=true --timeout=5m
  14. Optional: To ensure that the vault keys are deleted permanently you need to manually delete the metadata associated with the vault key.

    Note

    Execute this step only if Vault Key/Value (KV) secret engine API, version 2 is used for cluster-wide encryption with Key Management System (KMS) since the vault keys are marked as deleted and not permanently deleted during the uninstallation of OpenShift Container Storage. You can always restore it later if required.

    1. List the keys in the vault.

      $ vault kv list kv-v2

      Example output:

      Keys
      -----
      NOOBAA_ROOT_SECRET_PATH/
      rook-ceph-osd-encryption-key-ocs-deviceset-thin-0-data-0m27q8
      rook-ceph-osd-encryption-key-ocs-deviceset-thin-1-data-0sq227
      rook-ceph-osd-encryption-key-ocs-deviceset-thin-2-data-0xzszb
    2. List the metadata associated with the vault key.

      $ vault kv list kv-v2/<NOOBAA_ROOT_SECRET_PATH>
      <NOOBAA_ROOT_SECRET_PATH>

      Is the path to the encryption key.

      For Example:

      $ vault kv get kv-v2/rook-ceph-osd-encryption-key-ocs-deviceset-thin-0-data-0m27q8

      Example output:

      ====== Metadata ======
      Key              Value
      ---              -----
      created_time     2021-06-23T10:06:30.650103555Z
      deletion_time    2021-06-23T11:46:35.045328495Z
      destroyed        false
      version          1
    3. Delete the metadata.

      $ vault kv metadata delete kv-v2/<NOOBAA_ROOT_SECRET_PATH>
      <NOOBAA_ROOT_SECRET_PATH>

      Is the path to the encryption key.

      For Example:

      $ vault kv metadata delete kv-v2/rook-ceph-osd-encryption-key-ocs-deviceset-thin-0-data-0m27q8

      Example output:

      Success! Data deleted (if it existed) at: kv-v2/metadata/rook-ceph-osd-encryption-key-ocs-deviceset-thin-0-data-0m27q8
    4. Repeat these steps to delete the metadata associated with all the vault keys.
  15. To ensure that OpenShift Container Storage is uninstalled completely, on the OpenShift Container Platform Web Console,

    1. Click Storage.
    2. Verify that Overview no longer appears under Storage.

5.1.1. Removing local storage operator configurations

Use the instructions in this section only if you have deployed OpenShift Container Storage using local storage devices.

Note

For OpenShift Container Storage deployments using only localvolume resources, refer step 8.

Procedure

  1. Identify the LocalVolumeSet and the corresponding StorageClassName being used by OpenShift Container Storage.
  2. Set the variable SC to the StorageClass providing the LocalVolumeSet.

    $ export SC="<StorageClassName>"
  3. Delete the LocalVolumeSet.

    $ oc delete localvolumesets.local.storage.openshift.io <name-of-volumeset> -n openshift-local-storage
  4. Delete the local storage PVs for the given StorageClassName.

    $ oc get pv | grep $SC | awk '{print $1}'| xargs oc delete pv
  5. Delete the StorageClassName.

    $ oc delete sc $SC
  6. Delete the symlinks created by the LocalVolumeSet.

    [[ ! -z $SC ]] && for i in $(oc get node -l cluster.ocs.openshift.io/openshift-storage= -o jsonpath='{ .items[*].metadata.name }'); do oc debug node/${i} -- chroot /host rm -rfv /mnt/local-storage/${SC}/; done
  7. Delete LocalVolumeDiscovery.

    $ oc delete localvolumediscovery.local.storage.openshift.io/auto-discover-devices -n openshift-local-storage
  8. Removing LocalVolume resources (if any).

    Use the following steps to remove the LocalVolume resources used to provision PVs in the current or previous OpenShift Container Storage version. Also, ensure that these resources are not being used by other tenants in the cluster.

    For each of the local volumes, perform the following:

    1. Identify the LocalVolume and the corresponding StorageClassName being used by OpenShift Container Storage.
    2. Set the variable LV to the name of the LocalVolume and variable SC to the name of the StorageClass

      For example:

      $ LV=local-block
      $ SC=localblock
    3. Delete the local volume resource.

      $ oc delete localvolume -n local-storage --wait=true $LV
    4. Delete the remaining PVs and StorageClasses if they exist.

      $ oc delete pv -l storage.openshift.com/local-volume-owner-name=${LV} --wait --timeout=5m
      $ oc delete storageclass $SC --wait --timeout=5m
    5. Clean up the artifacts from the storage nodes for that resource.

      $ [[ ! -z $SC ]] && for i in $(oc get node -l cluster.ocs.openshift.io/openshift-storage= -o jsonpath='{ .items[*].metadata.name }'); do oc debug node/${i} -- chroot /host rm -rfv /mnt/local-storage/${SC}/; done

      Example output:

      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 ...

5.2. Removing monitoring stack from OpenShift Container Storage

Use this section to clean up the monitoring stack from OpenShift Container Storage.

The PVCs that are created as a part of configuring the monitoring stack are in the openshift-monitoring namespace.

Prerequisites

Procedure

  1. List the pods and PVCs that are currently running in the openshift-monitoring namespace.

    $ 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
  2. Edit the monitoring configmap.

    $ oc -n openshift-monitoring edit configmap cluster-monitoring-config
  3. Remove any config sections that reference the OpenShift Container Storage storage classes as shown in the following example and save it.

    Before editing

    .
    .
    .
    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
    .
    .
    .

    After editing

    .
    .
    .
    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
    .
    .
    .

    In this example, alertmanagerMain and prometheusK8s monitoring components are using the OpenShift Container Storage PVCs.

  4. Delete relevant PVCs. Make sure you delete all the PVCs that are consuming the storage classes.

    $ oc delete -n openshift-monitoring pvc <pvc-name> --wait=true --timeout=5m

5.3. Removing OpenShift Container Platform registry from OpenShift Container Storage

Use this section to clean up OpenShift Container Platform registry from OpenShift Container Storage. 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 Container Storage PVC.

Procedure

  1. Edit the configs.imageregistry.operator.openshift.io object and remove the content in the storage section.

    $ oc edit configs.imageregistry.operator.openshift.io

    Before editing

    .
    .
    .
    storage:
      pvc:
        claim: registry-cephfs-rwx-pvc
    .
    .
    .

    After editing

    .
    .
    .
    storage:
    .
    .
    .

    In this example, the PVC is called registry-cephfs-rwx-pvc, which is now safe to delete.

  2. Delete the PVC.

    $ oc delete pvc <pvc-name> -n openshift-image-registry --wait=true --timeout=5m

5.4. Removing the cluster logging operator from OpenShift Container Storage

To clean the cluster logging operator from the OpenShift Container Storage, follow the steps in the procedure.

The PVCs created as a part of configuring cluster logging operator are in the openshift-logging namespace.

Prerequisites

  • The cluster logging instance must be configured to use OpenShift Container Storage PVCs.

Procedure

  1. Remove the ClusterLogging instance in the namespace.

    $ oc delete clusterlogging instance -n openshift-logging --wait=true --timeout=5m

    The PVCs in the openshift-logging namespace are now safe to delete.

  2. Delete PVCs.

    $ oc delete pvc <pvc-name> -n openshift-logging --wait=true --timeout=5m