Retrieving OpenShift Cluster Logs

Logs are invaluable for understanding the state of your OpenShift cluster and diagnosing problems. OpenShift provides several ways to access these logs efficiently:

Get node logs

Display node journal:

oc adm node-logs <node>

Tail 10 lines from node journal:

oc adm node-logs --tail=10 <node>

Get kubelet journal logs only:

oc adm node-logs -u kubelet.service <node>

Grep kernel word on node journal:

oc adm node-logs --grep=kernel <node>

List /var/log contents:

oc adm node-logs --path=/ <node>

Get /var/log/audit/audit.log from node:

oc adm node-logs --path=audit/audit.log <node>

Pod Logs

Pod logs provide insights into application behavior.

• Retrieve logs for a specific pod:

oc logs <pod-name> -n <namespace>

• For pods with multiple containers, specify the container name:

oc logs <pod-name> -c <container-name> -n <namespace>

• Stream logs in real-time:

oc logs -f <pod-name> -n <namespace>