The pod is in Pending state. How to diagnose and fix it?

If a pod is in the Pending state, it means Kubernetes cannot start the containers due to resource or configuration issues. For diagnostics:

1. Run kubectl describe pod <pod-name> and check the Events section — it often indicates the reasons for Pending.
2. Check if there are enough resources (CPU, memory) on the nodes. There might be no free resources for the pod.
3. Ensure there are no issues with PersistentVolumeClaims if the pod uses volumes.
4. Verify that the nodes are available and not in the NotReady state.

To fix the issues:

• If resources are insufficient — increase limits or add nodes to the cluster.
• If there are volume issues — check the status of PVC and PV.
• If there are configuration errors (e.g., incorrect selectors or nodeSelector) — fix the manifest.

Example command to view events:

kubectl describe pod <pod-name>