Troubleshooting Kubernetes¶

Overview¶

This section provides guidance for diagnosing and resolving common problems in Kubernetes clusters.

When applications fail to deploy or behave unexpectedly, Kubernetes provides several tools to inspect cluster state, container logs, and resource configuration.

Common troubleshooting tasks include:

identifying failing pods
inspecting container logs
reviewing cluster events
validating configuration files

Basic Troubleshooting Workflow¶

A typical investigation follows these steps:

Identify the failing resource.
```
kubectl get pods
```
Inspect detailed resource information.
```
kubectl describe pod <pod-name>
```
Review container logs.
```
kubectl logs <pod-name>
```
Execute commands inside the container if necessary.
```
kubectl exec -it <pod-name> -- /bin/bash
```

Common Problem Categories¶

Pod Issues

CrashLoopBackOff
ImagePullBackOff
Pods stuck in Pending state

Networking Issues

Services not reachable
DNS failures
Network policy restrictions

Debugging Tools

Kubernetes provides several commands for debugging workloads:

kubectl describe
kubectl logs
kubectl exec
kubectl get events

Related Documentation

kubectl debugging
Pod troubleshooting guides