Chapter 21. Validating an installation
You can check the status of an OpenShift Container Platform cluster after an installation by following the procedures in this document.
21.1. Reviewing the installation log
You can review a summary of an installation in the OpenShift Container Platform installation log. If an installation succeeds, the information required to access the cluster is included in the log.
Prerequisites
- You have access to the installation host.
Procedure
Review the
.openshift_install.log
log file in the installation directory on your installation host:$ cat <install_dir>/.openshift_install.log
Example output
Cluster credentials are included at the end of the log if the installation is successful, as outlined in the following example:
... time="2020-12-03T09:50:47Z" level=info msg="Install complete!" time="2020-12-03T09:50:47Z" level=info msg="To access the cluster as the system:admin user when using 'oc', run 'export KUBECONFIG=/home/myuser/install_dir/auth/kubeconfig'" time="2020-12-03T09:50:47Z" level=info msg="Access the OpenShift web-console here: https://console-openshift-console.apps.mycluster.example.com" time="2020-12-03T09:50:47Z" level=info msg="Login to the console with user: \"kubeadmin\", and password: \"6zYIx-ckbW3-4d2Ne-IWvDF\"" time="2020-12-03T09:50:47Z" level=debug msg="Time elapsed per stage:" time="2020-12-03T09:50:47Z" level=debug msg=" Infrastructure: 6m45s" time="2020-12-03T09:50:47Z" level=debug msg="Bootstrap Complete: 11m30s" time="2020-12-03T09:50:47Z" level=debug msg=" Bootstrap Destroy: 1m5s" time="2020-12-03T09:50:47Z" level=debug msg=" Cluster Operators: 17m31s" time="2020-12-03T09:50:47Z" level=info msg="Time elapsed: 37m26s"
21.2. Viewing the image pull source
For clusters with unrestricted network connectivity, you can view the source of your pulled images by using a command on a node, such as crictl images
.
However, for disconnected installations, to view the source of pulled images, you must review the CRI-O logs to locate the Trying to access
log entry, as shown in the following procedure. Other methods to view the image pull source, such as the crictl images
command, show the non-mirrored image name, even though the image is pulled from the mirrored location.
Prerequisites
-
You have access to the cluster as a user with the
cluster-admin
role.
Procedure
Review the CRI-O logs for a master or worker node:
$ oc adm node-logs <node_name> -u crio
Example output
The
Trying to access
log entry indicates where the image is being pulled from.... Mar 17 02:52:50 ip-10-0-138-140.ec2.internal crio[1366]: time="2021-08-05 10:33:21.594930907Z" level=info msg="Pulling image: quay.io/openshift-release-dev/ocp-release:4.9.0-ppc64le" id=abcd713b-d0e1-4844-ac1c-474c5b60c07c name=/runtime.v1alpha2.ImageService/PullImage Mar 17 02:52:50 ip-10-0-138-140.ec2.internal crio[1484]: time="2021-03-17 02:52:50.194341109Z" level=info msg="Trying to access \"li0317gcp1.mirror-registry.qe.gcp.devcluster.openshift.com:5000/ocp/release@sha256:1926eae7cacb9c00f142ec98b00628970e974284b6ddaf9a6a086cb9af7a6c31\"" Mar 17 02:52:50 ip-10-0-138-140.ec2.internal crio[1484]: time="2021-03-17 02:52:50.226788351Z" level=info msg="Trying to access \"li0317gcp1.mirror-registry.qe.gcp.devcluster.openshift.com:5000/ocp/release@sha256:1926eae7cacb9c00f142ec98b00628970e974284b6ddaf9a6a086cb9af7a6c31\"" ...
The log might show the image pull source twice, as shown in the preceding example.
If your
ImageContentSourcePolicy
object lists multiple mirrors, OpenShift Container Platform attempts to pull the images in the order listed in the configuration, for example:Trying to access \"li0317gcp1.mirror-registry.qe.gcp.devcluster.openshift.com:5000/ocp/release@sha256:1926eae7cacb9c00f142ec98b00628970e974284b6ddaf9a6a086cb9af7a6c31\" Trying to access \"li0317gcp2.mirror-registry.qe.gcp.devcluster.openshift.com:5000/ocp/release@sha256:1926eae7cacb9c00f142ec98b00628970e974284b6ddaf9a6a086cb9af7a6c31\"
21.3. Getting cluster version, status, and update details
You can view the cluster version and status by running the oc get clusterversion
command. If the status shows that the installation is still progressing, you can review the status of the Operators for more information.
You can also list the current update channel and review the available cluster updates.
Prerequisites
-
You have access to the cluster as a user with the
cluster-admin
role. -
You have installed the OpenShift CLI (
oc
).
Procedure
Obtain the cluster version and overall status:
$ oc get clusterversion
Example output
NAME VERSION AVAILABLE PROGRESSING SINCE STATUS version 4.6.4 True False 6m25s Cluster version is 4.6.4
The example output indicates that the cluster has been installed successfully.
If the cluster status indicates that the installation is still progressing, you can obtain more detailed progress information by checking the status of the Operators:
$ oc get clusteroperators.config.openshift.io
View a detailed summary of cluster specifications, update availability, and update history:
$ oc describe clusterversion
List the current update channel:
$ oc get clusterversion -o jsonpath='{.items[0].spec}{"\n"}'
Example output
{"channel":"stable-4.6","clusterID":"245539c1-72a3-41aa-9cec-72ed8cf25c5c"}
Review the available cluster updates:
$ oc adm upgrade
Example output
Cluster version is 4.6.4 Updates: VERSION IMAGE 4.6.6 quay.io/openshift-release-dev/ocp-release@sha256:c7e8f18e8116356701bd23ae3a23fb9892dd5ea66c8300662ef30563d7104f39
Additional resources
- See Querying Operator status after installation for more information about querying Operator status if your installation is still progressing.
- See Troubleshooting Operator issues for information about investigating issues with Operators.
- See Updating a cluster for more information on updating your cluster.
- See OpenShift Container Platform upgrade channels and releases for an overview about upgrade release channels.
21.4. Querying the status of the cluster nodes by using the CLI
You can verify the status of the cluster nodes after an installation.
Prerequisites
-
You have access to the cluster as a user with the
cluster-admin
role. -
You have installed the OpenShift CLI (
oc
).
Procedure
List the status of the cluster nodes. Verify that the output lists all of the expected control plane and compute nodes and that each node has a
Ready
status:$ oc get nodes
Example output
NAME STATUS ROLES AGE VERSION compute-1.example.com Ready worker 33m v1.22.1 control-plane-1.example.com Ready master 41m v1.22.1 control-plane-2.example.com Ready master 45m v1.22.1 compute-2.example.com Ready worker 38m v1.22.1 compute-3.example.com Ready worker 33m v1.22.1 control-plane-3.example.com Ready master 41m v1.22.1
Review CPU and memory resource availability for each cluster node:
$ oc adm top nodes
Example output
NAME CPU(cores) CPU% MEMORY(bytes) MEMORY% compute-1.example.com 128m 8% 1132Mi 16% control-plane-1.example.com 801m 22% 3471Mi 23% control-plane-2.example.com 1718m 49% 6085Mi 40% compute-2.example.com 935m 62% 5178Mi 75% compute-3.example.com 111m 7% 1131Mi 16% control-plane-3.example.com 942m 26% 4100Mi 27%
Additional resources
- See Verifying node health for more details about reviewing node health and investigating node issues.
21.5. Reviewing the cluster status from the OpenShift Container Platform web console
You can review the following information in the Overview page in the OpenShift Container Platform web console:
- The general status of your cluster
- The status of the control plane, cluster Operators, and storage
- CPU, memory, file system, network transfer, and pod availability
- The API address of the cluster, the cluster ID, and the name of the provider
- Cluster version information
- Cluster update status, including details of the current update channel and available updates
- A cluster inventory detailing node, pod, storage class, and persistent volume claim (PVC) information
- A list of ongoing cluster activities and recent events
Prerequisites
-
You have access to the cluster as a user with the
cluster-admin
role.
Procedure
-
In the Administrator perspective, navigate to Home
Overview.
21.6. Reviewing the cluster status from Red Hat OpenShift Cluster Manager
From the OpenShift Container Platform web console, you can review detailed information about the status of your cluster on OpenShift Cluster Manager.
Prerequisites
-
You have access to the cluster as a user with the
cluster-admin
role.
Procedure
-
In the Administrator perspective, navigate to Home
Overview Details Cluster ID OpenShift Cluster Manager to open your cluster’s Overview tab in the OpenShift Cluster Manager web console. From the Overview tab on OpenShift Cluster Manager, review the following information about your cluster:
- vCPU and memory availability and resource usage
- The cluster ID, status, type, region, and the provider name
- Node counts by node type
- Cluster version details, the creation date of the cluster, and the name of the cluster owner
- The life cycle support status of the cluster
Subscription information, including the service level agreement (SLA) status, the subscription unit type, the production status of the cluster, the subscription obligation, and the service level
TipTo view the history for your cluster, click the Cluster history tab.
Navigate to the Monitoring page to review the following information:
- A list of any issues that have been detected
- A list of alerts that are firing
- The cluster Operator status and version
- The cluster’s resource usage
Optional: You can view information about your cluster that Red Hat Insights collects by navigating to the Overview menu. From this menu you can view the following information:
- Potential issues that your cluster might be exposed to, categorized by risk level
- Health-check status by category
Additional resources
- See Using Insights to identify issues with your cluster for more information about reviewing potential issues with your cluster.
21.7. Checking cluster resource availability and utilization
OpenShift Container Platform provides a comprehensive set of monitoring dashboards that help you understand the state of cluster components.
In the Administrator perspective, you can access dashboards for core OpenShift Container Platform components, including:
- etcd
- Kubernetes compute resources
- Kubernetes network resources
- Prometheus
- Dashboards relating to cluster and node performance
Figure 21.1. Example compute resources dashboard
Prerequisites
-
You have access to the cluster as a user with the
cluster-admin
role.
Procedure
-
In the Administrator perspective in the OpenShift Container Platform web console, navigate to Observe
Dashboards. - Choose a dashboard in the Dashboard list. Some dashboards, such as the etcd dashboard, produce additional sub-menus when selected.
Optional: Select a time range for the graphs in the Time Range list.
- Select a pre-defined time period.
Set a custom time range by selecting Custom time range in the Time Range list.
- Input or select the From and To dates and times.
- Click Save to save the custom time range.
- Optional: Select a Refresh Interval.
- Hover over each of the graphs within a dashboard to display detailed information about specific items.
Additional resources
- See Monitoring overview for more information about the OpenShift Container Platform monitoring stack.
21.8. Listing alerts that are firing
Alerts provide notifications when a set of defined conditions are true in an OpenShift Container Platform cluster. You can review the alerts that are firing in your cluster by using the Alerting UI in the OpenShift Container Platform web console.
Prerequisites
-
You have access to the cluster as a user with the
cluster-admin
role.
Procedure
-
In the Administrator perspective, navigate to the Observe
Alerting Alerts page. - Review the alerts that are firing, including their Severity, State, and Source.
- Select an alert to view more detailed information in the Alert Details page.
Additional resources
- See Managing alerts for further details about alerting in OpenShift Container Platform.
21.9. Next steps
- See Troubleshooting installations if you experience issues when installing your cluster.
- After installing OpenShift Container Platform, you can further expand and customize your cluster.