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Chapter 4. Troubleshooting a cluster update
4.1. Gathering data about your cluster update
When reaching out to Red Hat support for issues with an update, it is important to provide data for the support team to use for troubleshooting your failed cluster update.
4.1.1. Gathering log data for a support case
To gather data from your cluster, including log data, use the oc adm must-gather command. See Gathering data about your cluster.
4.1.2. Gathering cluster update status using oc adm upgrade status (Technology Preview)
When updating your cluster, it is useful to understand how your update is progressing. While the oc adm upgrade command returns limited information about the status of your update, this release introduces the oc adm upgrade status command as a Technology Preview feature. This command decouples status information from the oc adm upgrade command and provides specific information regarding a cluster update, including the status of the control plane and worker node updates.
The oc adm upgrade status command is read-only and will never alter any state in your cluster.
The oc adm upgrade status command is a Technology Preview feature only. Technology Preview features are not supported with Red Hat production service level agreements (SLAs) and might not be functionally complete. Red Hat does not recommend using them in production. These features provide early access to upcoming product features, enabling customers to test functionality and provide feedback during the development process.
For more information about the support scope of Red Hat Technology Preview features, see Technology Preview Features Support Scope.
The oc adm upgrade status command can be used for clusters from version 4.12 up to the latest supported release.
While your cluster does not need to be a Technology Preview-enabled cluster, you must enable the OC_ENABLE_CMD_UPGRADE_STATUS Technology Preview environment variable, otherwise the OpenShift CLI (oc) will not recognize the command and you will not be able to use the feature.
Procedure
Set the
OC_ENABLE_CMD_UPGRADE_STATUSenvironmental variable totrueby running the following command:$ export OC_ENABLE_CMD_UPGRADE_STATUS=true
Run the
oc adm upgrade statuscommand:$ oc adm upgrade status
Example 4.1. Example output for an update progressing successfully
= Control Plane = Assessment: Progressing Target Version: 4.14.1 (from 4.14.0) Completion: 97% Duration: 54m Operator Status: 32 Healthy, 1 Unavailable Control Plane Nodes NAME ASSESSMENT PHASE VERSION EST MESSAGE ip-10-0-53-40.us-east-2.compute.internal Progressing Draining 4.14.0 +10m ip-10-0-30-217.us-east-2.compute.internal Outdated Pending 4.14.0 ? ip-10-0-92-180.us-east-2.compute.internal Outdated Pending 4.14.0 ? = Worker Upgrade = = Worker Pool = Worker Pool: worker Assessment: Progressing Completion: 0% Worker Status: 3 Total, 2 Available, 1 Progressing, 3 Outdated, 1 Draining, 0 Excluded, 0 Degraded Worker Pool Nodes NAME ASSESSMENT PHASE VERSION EST MESSAGE ip-10-0-4-159.us-east-2.compute.internal Progressing Draining 4.14.0 +10m ip-10-0-20-162.us-east-2.compute.internal Outdated Pending 4.14.0 ? ip-10-0-99-40.us-east-2.compute.internal Outdated Pending 4.14.0 ? = Worker Pool = Worker Pool: infra Assessment: Progressing Completion: 0% Worker Status: 1 Total, 0 Available, 1 Progressing, 1 Outdated, 1 Draining, 0 Excluded, 0 Degraded Worker Pool Node NAME ASSESSMENT PHASE VERSION EST MESSAGE ip-10-0-4-159-infra.us-east-2.compute.internal Progressing Draining 4.14.0 +10m = Update Health = SINCE LEVEL IMPACT MESSAGE 14m4s Info None Update is proceeding well
With this information, you can make informed decisions on how to proceed with your update.
4.1.3. Gathering ClusterVersion history
The Cluster Version Operator (CVO) records updates made to a cluster, known as the ClusterVersion history. The entries can reveal correlation between changes in cluster behavior with potential triggers, although correlation does not imply causation.
The initial, minor, and z-stream version updates are stored by the ClusterVersion history. However, the ClusterVersion history has a size limit. If the limit is reached, the oldest z-stream updates in previous minor versions are pruned to accommodate the limit.
You can view the ClusterVersion history by using the OpenShift Container Platform web console or by using the OpenShift CLI (oc).
4.1.3.1. Gathering ClusterVersion history in the OpenShift Container Platform web console
You can view the ClusterVersion history in the OpenShift Container Platform web console.
Prerequisites
-
You have access to the cluster as a user with the
cluster-adminrole. - You have access to the OpenShift Container Platform web console.
Procedure
-
From the web console, click Administration
Cluster Settings and review the contents of the Details tab.
4.1.3.2. Gathering ClusterVersion history using the OpenShift CLI (oc)
You can view the ClusterVersion history using the OpenShift CLI (oc).
Prerequisites
-
You have access to the cluster as a user with the
cluster-adminrole. -
You have installed the OpenShift CLI (
oc).
Procedure
View the cluster update history by entering the following command:
$ oc describe clusterversions/version
Example output
Desired: Channels: candidate-4.13 candidate-4.14 fast-4.13 fast-4.14 stable-4.13 Image: quay.io/openshift-release-dev/ocp-release@sha256:a148b19231e4634196717c3597001b7d0af91bf3a887c03c444f59d9582864f4 URL: https://access.redhat.com/errata/RHSA-2023:6130 Version: 4.13.19 History: Completion Time: 2023-11-07T20:26:04Z Image: quay.io/openshift-release-dev/ocp-release@sha256:a148b19231e4634196717c3597001b7d0af91bf3a887c03c444f59d9582864f4 Started Time: 2023-11-07T19:11:36Z State: Completed Verified: true Version: 4.13.19 Completion Time: 2023-10-04T18:53:29Z Image: quay.io/openshift-release-dev/ocp-release@sha256:eac141144d2ecd6cf27d24efe9209358ba516da22becc5f0abc199d25a9cfcec Started Time: 2023-10-04T17:26:31Z State: Completed Verified: true Version: 4.13.13 Completion Time: 2023-09-26T14:21:43Z Image: quay.io/openshift-release-dev/ocp-release@sha256:371328736411972e9640a9b24a07be0af16880863e1c1ab8b013f9984b4ef727 Started Time: 2023-09-26T14:02:33Z State: Completed Verified: false Version: 4.13.12 Observed Generation: 4 Version Hash: CMLl3sLq-EA= Events: <none>
Additional resources
