Chapter 2. Deploying OpenShift Container Storage on Red Hat OpenStack Platform in external mode
Red Hat OpenShift Container Storage can use an externally hosted Red Hat Ceph Storage (RHCS) cluster as the storage provider on Red Hat OpenStack Platform. See Planning your deployment for more information.
For instructions regarding how to install a RHCS 4 cluster, see Installation guide.
Follow these steps to deploy OpenShift Container Storage in external mode:
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. For information about the hardware and software requirements, see Planning your deployment.
Prerequisites
- You must be logged into the OpenShift Container Platform (RHOCP) cluster.
- You must have at least three worker nodes in the RHOCP cluster.
When you need to override the cluster-wide default node selector for OpenShift Container Storage, you can use the following command in command line interface to specify a blank node selector for the
openshift-storage
namespace:$ 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
-
Click Operators
OperatorHub in the left pane of the OpenShift Web Console. - Use Filter by keyword text box or the filter list to search for OpenShift Container Storage from the list of operators.
- Click OpenShift Container Storage.
- On the OpenShift Container Storage operator page, click Install.
On the Install Operator page, ensure the following options are selected by default::
- Update Channel as stable-4.6
- Installation Mode as A specific namespace on the cluster
-
Installed Namespace as Operator recommended namespace openshift-storage. If Namespace
openshift-storage
does not exist, it will be created during the operator installation. - Select Enable operator recommended cluster monitoring on this namespace checkbox as this is required for cluster monitoring.
Select Approval Strategy as Automatic or Manual. Approval Strategy is set to Automatic by default.
Approval Strategy as Automatic.
NoteWhen you select the Approval Strategy as Automatic, approval is not required either during fresh installation or when updating to the latest version of OpenShift Container Storage.
- Click Install
- Wait for the install to initiate. This may take up to 20 minutes.
-
Click Operators
Installed Operators -
Ensure the Project is
openshift-storage
. By default, the Project isopenshift-storage
. - Wait for the Status of OpenShift Container Storage to change to Succeeded.
Approval Strategy as Manual.
NoteWhen you select the Approval Strategy as Manual, approval is required during fresh installation or when updating to the latest version of OpenShift Container Storage.
- Click Install
On the Manual approval required page, you can either click Approve or View Installed Operators in namespace openshift-storage to install the operator.
ImportantBefore you click either of the options, wait for a few minutes on the Manual approval required page until the install plan gets loaded in the window.
ImportantIf you choose to click Approve, you must review the install plan before you proceed.
If you click Approve.
- Wait for a few minutes while the OpenShift Container Storage Operator is getting installed.
- On the Installed operator - ready for use page, click View Operator.
-
Ensure the Project is
openshift-storage
. By default, the Project isopenshift-storage
. -
Click Operators
Installed Operators - Wait for the Status of OpenShift Container Storage to change to Succeeded.
If you click View Installed Operators in namespace openshift-storage .
- On the Installed Operators page, click ocs-operator.
- On the Subscription Details page, click the Install Plan link.
- On the InstallPlan Details page, click Preview Install Plan.
- Review the install plan and click Approve.
- Wait for the Status of the Components to change from Unknown to either Created or Present.
-
Click Operators
Installed Operators -
Ensure the Project is
openshift-storage
. By default, the Project isopenshift-storage
. - Wait for the Status of OpenShift Container Storage to change to Succeeded.
Verification steps
- Verify that OpenShift Container Storage Operator shows a green tick indicating successful installation.
-
Click View Installed Operators in namespace openshift-storage link to verify that OpenShift Container Storage Operator shows the Status as
Succeeded
on the Installed Operators dashboard.
2.2. Creating an OpenShift Container Storage Cluster service for external mode
You need to create a new OpenShift Container Storage cluster service after you install OpenShift Container Storage operator on OpenShift Container Platform deployed on Red Hat OpenStack platform.
Prerequisites
- You must be logged into the working OpenShift Container Platform version 4.5.4 or above.
- OpenShift Container Storage operator must be installed. For more information, see Installing OpenShift Container Storage Operator using the Operator Hub.
Red Hat Ceph Storage version 4.2z1 or later is required for the external cluster. For more information, see this knowledge base article on Red Hat Ceph Storage releases and corresponding Ceph package versions.
If you have updated the Red Hat Ceph Storage cluster from a version lower than 4.1.1 to the latest release and is not a freshly deployed cluster, you must manually set the application type for CephFS pool on the Red Hat Ceph Storage cluster to enable CephFS PVC creation in external mode.
For more details, see Troubleshooting CephFS PVC creation in external mode.
-
Red Hat Ceph Storage must have Ceph Dashboard installed and configured, and must use port
9283
for Ceph Manager Prometheus exporter. For more information, see Ceph Dashboard installation and access. - It is recommended that the PG Autoscaler option must be enabled for the external Red Hat Ceph Storage cluster. For more information, see The placement group autoscaler section in the Red Hat Ceph Storage documentation.
- The external Ceph cluster should have an existing RBD pool pre-configured for use. If it does not exist, contact your Red Hat Ceph Storage administrator to create one before you move ahead with OpenShift Container Storage deployment. It is recommended to use a separate pool for each OpenShift Container Storage cluster.
Procedure
Click Operators
Installed Operators to view all the installed operators. Ensure that the Project selected is openshift-storage.
Figure 2.1. OpenShift Container Storage Operator page
Click OpenShift Container Storage.
Figure 2.2. Details tab of OpenShift Container Storage
- Click Create Instance link of Storage Cluster.
Select Mode as External. By default, Internal is selected as deployment mode.
Figure 2.3. Connect to external cluster section on Create Storage Cluster form
- In the Connect to external cluster section, click on the Download Script link to download the python script for extracting Ceph cluster details.
For extracting the Red Hat Ceph Storage (RHCS) cluster details, contact the RHCS administrator to run the downloaded python script on a Red Hat Ceph Storage node with
admin key
.Run the following command on the RHCS node to view the list of available arguments.
# python3 ceph-external-cluster-details-exporter.py --help
ImportantUse
python
instead ofpython3
if the Red Hat Ceph Storage 4.x cluster is deployed on Red Hat Enterprise Linux 7.x (RHEL 7.x) cluster.NoteYou can also run the script from inside a MON container (containerized deployment) or from a MON node (rpm deployment).
To retrieve the external cluster details from the RHCS cluster, run the following command
# python3 ceph-external-cluster-details-exporter.py \ --rbd-data-pool-name <rbd block pool name> [optional arguments]
For example:
# python3 ceph-external-cluster-details-exporter.py --rbd-data-pool-name ceph-rbd --monitoring-endpoint xxx.xxx.xxx.xxx --monitoring-endpoint-port 9283 --rgw-endpoint xxx.xxx.xxx.xxx:xxxx --run-as-user client.ocs
In the above example,
-
--rbd-data-pool-name
is a mandatory parameter used for providing block storage in OpenShift Container Storage. -
--rgw-endpoint
is optional. Provide this parameter if object storage is to be provisioned through Ceph Rados Gateway for OpenShift Container Storage. Provide the endpoint in the following format:<ip_address>:<port>
-
--monitoring-endpoint
is optional. It is the IP address of the activeceph-mgr
reachable from the OpenShift Container Platform cluster. If not provided, the value is automatically populated. -
--monitoring-endpoint-port
is optional. It is the port associated with theceph-mgr
Prometheus exporter specified by--monitoring-endpoint
. If not provided, the value is automatically populated. Only port9283
is supported in OpenShift Container Storage 4.6. -- run-as-user
is an optional parameter used for providing a name for the Ceph user which is created by the script. If this parameter is not specified, a default user nameclient.healthchecker
is created. The permissions for the new user is set as:- caps: [mgr] allow command config
- caps: [mon] allow r, allow command quorum_status, allow command version
caps: [osd] allow rwx pool=
RGW_POOL_PREFIX.rgw.meta
, allow r pool=.rgw.root
, allow rw pool=RGW_POOL_PREFIX.rgw.control
, allow rx pool=RGW_POOL_PREFIX.rgw.log
, allow x pool=RGW_POOL_PREFIX.rgw.buckets.index
Example of JSON output generated using the python script:
[{"name": "rook-ceph-mon-endpoints", "kind": "ConfigMap", "data": {"data": "xxx.xxx.xxx.xxx:xxxx", "maxMonId": "0", "mapping": "{}"}}, {"name": "rook-ceph-mon", "kind": "Secret", "data": {"admin-secret": "admin-secret", "fsid": "<fs-id>", "mon-secret": "mon-secret"}}, {"name": "rook-ceph-operator-creds", "kind": "Secret", "data": {"userID": "client.healthchecker", "userKey": "<user-key>"}}, {"name": "rook-csi-rbd-node", "kind": "Secret", "data": {"userID": "csi-rbd-node", "userKey": "<user-key>"}}, {"name": "ceph-rbd", "kind": "StorageClass", "data": {"pool": "ceph-rbd"}}, {"name": "monitoring-endpoint", "kind": "CephCluster", "data": {"MonitoringEndpoint": "xxx.xxx.xxx.xxx", "MonitoringPort": "xxxx"}}, {"name": "rook-csi-rbd-provisioner", "kind": "Secret", "data": {"userID": "csi-rbd-provisioner", "userKey": "<user-key>"}}, {"name": "rook-csi-cephfs-provisioner", "kind": "Secret", "data": {"adminID": "csi-cephfs-provisioner", "adminKey": "<admin-key>"}}, {"name": "rook-csi-cephfs-node", "kind": "Secret", "data": {"adminID": "csi-cephfs-node", "adminKey": "<admin-key>"}}, {"name": "cephfs", "kind": "StorageClass", "data": {"fsName": "cephfs", "pool": "cephfs_data"}}, {"name": "ceph-rgw", "kind": "StorageClass", "data": {"endpoint": "xxx.xxx.xxx.xxx:xxxx", "poolPrefix": "default"}}]
-
Save the JSON output to a file with
.json
extensionNoteFor OpenShift Container Storage to work seamlessly, ensure that the parameters (RGW endpoint, CephFS details, RBD pool, and so on) to be uploaded using the JSON file remains unchanged on the RHCS external cluster after the storage cluster creation.
Click External cluster metadata
Browse to select and upload the JSON file. The content of the JSON file is populated and displayed in the text box.
Figure 2.4. Json file content
Click Create.
The Create button is enabled only after you upload the
.json
file.
Verification steps
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.
-
Click Operators
- To verify that OpenShift Container Storage, pods and StorageClass are successfully installed, see Verifying your external mode OpenShift Container Storage installation.
2.3. Verifying your OpenShift Container Storage installation for external mode
Use this section to verify that OpenShift Container Storage is deployed correctly.
2.3.1. Verifying the state of the pods
-
Click Workloads
Pods from the left pane of the OpenShift Web Console. 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 2.1, “Pods corresponding to OpenShift Container Storage components”
Verify that the following pods are in running state:
Table 2.1. Pods corresponding to OpenShift Container Storage components Component Corresponding 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 worker node) -
noobaa-db-*
(1 pod on any worker node) -
noobaa-endpoint-*
(1 pod on any worker node)
CSI
cephfs
-
csi-cephfsplugin-*
(1 pod on each worker node) -
csi-cephfsplugin-provisioner-*
(2 pods distributed across worker nodes)
-
NoteIf an MDS is not deployed in the external cluster, the csi-cephfsplugin pods will not be created.
rbd
-
csi-rbdplugin-*
(1 pod on each worker node) -
csi-rbdplugin-provisioner-*
(2 pods distributed across worker nodes)
-
-
2.3.2. Verifying that the OpenShift Container Storage cluster is healthy
-
Click Home
Overview from the left pane of the OpenShift Web Console and click Persistent Storage tab. In the Status card, verify that OCS Cluster has a green tick mark as shown in the following image:
Figure 2.5. Health status card in Persistent Storage Overview Dashboard
In the Details card, verify that the cluster information is displayed as follows:
- Service Name
- OpenShift Container Storage
- Cluster Name
- ocs-external-storagecluster
- Provider
- OpenStack
- Mode
- External
- Version
- ocs-operator-4.6.0
For more information on the health of OpenShift Container Storage cluster using the persistent storage dashboard, see Monitoring OpenShift Container Storage.
2.3.3. Verifying that the Multicloud Object Gateway is healthy
-
Click Home
Overview from the left pane of the OpenShift Web Console and click the Object Service tab. In the Status card, verify that both Object Service and Data Resiliency are in
Ready
state (green tick).Figure 2.6. Health status card in Object Service Overview Dashboard
In the Details card, verify that the MCG information is displayed appropriately as follows:
- Service Name
- OpenShift Container Storage
- System Name
Multicloud Object Gateway
RADOS Object Gateway
- Provider
- OpenStack
- Version
- ocs-operator-4.6.0
The RADOS Object Gateway is only listed in case RADOS Object Gateway endpoint details were included while deploying OpenShift Container Storage in external mode.
For more information on the health of OpenShift Container Storage cluster using the object service dashboard, see Monitoring OpenShift Container Storage.
2.3.4. Verifying that the storage classes are created and listed
-
Click Storage
Storage Classes from the left pane of the OpenShift Web Console. Verify that the following storage classes are created with the OpenShift Container Storage cluster creation:
-
ocs-external-storagecluster-ceph-rbd
-
ocs-external-storagecluster-ceph-rgw
-
ocs-external-storagecluster-cephfs
-
openshift-storage.noobaa.io
-
-
If an MDS is not deployed in the external cluster,
ocs-external-storagecluster-cephfs
storage class will not be created. -
If an RGW is not deployed in the external cluster, the
ocs-external-storagecluster-ceph-rgw
storage class will not be created.
For more information regarding MDS and RGW, see Red Hat Ceph Storage documentation
2.3.5. Verifying that Ceph cluster is connected
Run the following command to verify if the OpenShift Container Storage cluster is connected to the external Red Hat Ceph Storage cluster.
$ oc get cephcluster -n openshift-storage
NAME DATADIRHOSTPATH MONCOUNT AGE PHASE MESSAGE HEALTH ocs-external-storagecluster-cephcluster 31m15s Connected Cluster connected successfully HEALTH_OK
2.3.6. Verifying that storage cluster is ready
Run the following command to verify if the storage cluster is ready and the External
option is set to true.
$ oc get storagecluster -n openshift-storage
NAME AGE PHASE EXTERNAL CREATED AT VERSION ocs-external-storagecluster 31m15s Ready true 2020-07-29T20:43:04Z 4.6.0
2.4. Uninstalling OpenShift Container Storage in external mode
2.4.1. Uninstalling OpenShift Container Storage in External mode
Use the steps in this section to uninstall OpenShift Container Storage. Uninstalling OpenShift Container Storage 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
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:
Annotation | Value | Default | Behavior |
---|---|---|---|
cleanup-policy | delete | Yes |
Rook cleans up the physical drives and the |
cleanup-policy | retain | No |
Rook does not clean up the physical drives and the |
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:
$ oc annotate storagecluster ocs-external-storagecluster uninstall.ocs.openshift.io/mode="forced" --overwrite storagecluster.ocs.openshift.io/ocs-external-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.
Procedure
Delete the volume snapshots that are using OpenShift Container Storage.
List the volume snapshots from all the namespaces
$ oc get volumesnapshot --all-namespaces
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>
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 so will result in orphan PVCs and OBCs in the system.
Delete OpenShift Container Platform monitoring stack PVCs using OpenShift Container Storage.
See Section 1.4.1.1, “Removing monitoring stack from OpenShift Container Storage”
Delete OpenShift Container Platform Registry PVCs using OpenShift Container Storage.
See Section 1.4.1.2, “Removing OpenShift Container Platform registry from OpenShift Container Storage”
Delete OpenShift Container Platform logging PVCs using OpenShift Container Storage.
See Section 1.4.1.3, “Removing the cluster logging operator from OpenShift Container Storage”
Delete other PVCs and OBCs provisioned using OpenShift Container Storage.
Given below is a sample script to identify the PVCs and OBCs provisioned using OpenShift Container Storage. The script ignores the PVCs and OBCs 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
Delete the OBCs.
$ oc delete obc <obc name> -n <project name>
Delete the PVCs.
$ oc delete pvc <pvc name> -n <project-name>
Ensure that you have removed any custom backing stores, bucket classes, etc., created in the cluster.
Delete the Storage Cluster object and wait for the removal of the associated resources.
$ oc delete -n openshift-storage storagecluster --all --wait=true
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:
$ 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
NoteWhile uninstalling OpenShift Container Storage, 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 Container Storage are deleted. If there is any PV left in the
Released
state, delete it.$ oc get pv $ oc delete pv <pv name>
Delete the Multicloud Object Gateway storageclass.
$ oc delete storageclass openshift-storage.noobaa.io --wait=true --timeout=5m
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
To ensure that OpenShift Container Storage is uninstalled completely, on the OpenShift Container Platform Web Console,
-
Click Home
Overview to access the dashboard. - Verify that the Persistent Storage and Object Service tabs no longer appear next to the Cluster tab.
-
Click Home
2.4.2. 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
PVCs are configured to use 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.$ 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
Edit the monitoring
configmap
.$ oc -n openshift-monitoring edit configmap cluster-monitoring-config
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-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 . . .
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
andprometheusK8s
monitoring components are using the OpenShift Container Storage PVCs.List the pods consuming the PVC.
In this example, the
alertmanagerMain
andprometheusK8s
pods that were consuming the PVCs are in theTerminating
state. You can delete the PVCs once these pods are no longer using OpenShift Container Storage PVC.$ 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
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
2.4.3. 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
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: emptyDir: {} . . .
In this example, the PVC is called
registry-cephfs-rwx-pvc
, which is now safe to delete.Delete the PVC.
$ oc delete pvc <pvc-name> -n openshift-image-registry --wait=true --timeout=5m
2.4.4. Removing the cluster logging operator from OpenShift Container Storage
Use this section to clean up the cluster logging operator from OpenShift Container Storage.
The PVCs that are created as a part of configuring cluster logging operator are in the openshift-logging
namespace.
Prerequisites
- The cluster logging instance should have been configured to use OpenShift Container Storage PVCs.
Procedure
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.Delete PVCs.
$ oc delete pvc <pvc-name> -n openshift-logging --wait=true --timeout=5m