Cloud Intermediate
Kubernetes Debugging¶
KubernetesDebuggingTroubleshooting 3 min read
Jak debugovat problémy v Kubernetes. Kubectl příkazy, events, logs a ephemeral containers.
Základní debugging¶
# Pod status a events
kubectl describe pod myapp-xyz
kubectl get events --sort-by='.lastTimestamp'
# Logy
kubectl logs myapp-xyz
kubectl logs myapp-xyz --previous # Po crashloopback
kubectl logs -l app=myapp --all-containers
# Shell do kontejneru
kubectl exec -it myapp-xyz -- sh
# Ephemeral debug container
kubectl debug -it myapp-xyz --image=busybox
Běžné problémy¶
- CrashLoopBackOff — kontrola logs –previous
- ImagePullBackOff — špatný image name nebo registry auth
- Pending — nedostatek zdrojů (kubectl describe)
- OOMKilled — zvyšte memory limit
Advanced¶
# Network debugging
kubectl run debug --image=nicolaka/netshoot -it --rm -- bash
# DNS test
nslookup my-service.default.svc.cluster.local
# Port forward
kubectl port-forward svc/myservice 8080:80
Summary¶
kubectl describe a logs řeší 80% problémů. Pro network problémy použijte netshoot image.
Need Help with Implementation?¶
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