Overview:

Learn to identify and resolve common issues in Kubernetes clusters.

Common Troubleshooting Tools:

1. kubectl describe:

   • Use this command to inspect resources:

     kubectl describe pod <pod-name>

2. kubectl logs:

   • View container logs:

     kubectl logs <pod-name>

3. kubectl exec:

   • Access a container’s shell:

     kubectl exec -it <pod-name> -- /bin/sh

4. kubectl get events:

   • Check cluster events:

     kubectl get events

Debugging Node Issues:

1. Check Node Status:

   kubectl get nodes

2. SSH into a Node:

   • Access the node and inspect system logs:

     journalctl -xe

Debugging Network Issues:

1. Check Network Policies:

   kubectl get networkpolicy

2. Inspect DNS Resolution:

   • Test DNS resolution within a Pod:

     kubectl exec -it <pod-name> -- nslookup <service-name>

Activity:

Simulate a failed deployment and use kubectl commands to troubleshoot and resolve the issue.