Containers & Orchestration Skill

Overview

Master Docker and Kubernetes for production deployments.

Parameters

Core Topics

MANDATORY

• Docker fundamentals (images, containers, volumes)
• Dockerfile best practices (multi-stage, security)
• Docker Compose
• Kubernetes architecture
• Deployments, Services, Ingress
• Health checks

OPTIONAL

• Helm charts
• ConfigMaps and Secrets
• Persistent storage
• Network policies

ADVANCED

• Custom operators
• Service mesh
• Multi-cluster strategies

Quick Reference

# Docker
docker build -t app:v1 .
docker run -d -p 8080:80 --name app app:v1
docker logs -f container
docker exec -it container sh
docker system prune -af

# Docker Compose
docker compose up -d
docker compose logs -f
docker compose down -v

# Kubernetes
kubectl get pods -A
kubectl describe pod pod-name
kubectl logs -f pod-name
kubectl exec -it pod-name -- sh
kubectl apply -f manifest.yaml
kubectl rollout status deployment/app
kubectl rollout undo deployment/app

# Debugging
kubectl get events --sort-by='.lastTimestamp'
kubectl top pods
kubectl run debug --rm -it --image=busybox -- sh

# Helm
helm install release chart
helm upgrade release chart
helm rollback release 1

Troubleshooting

Common Failures

Debug Checklist

1. Pod status: kubectl get pods -o wide
2. Events: kubectl describe pod
3. Logs: kubectl logs pod --previous
4. Resources: kubectl top pods

Recovery Procedures

CrashLoopBackOff

1. Get logs: kubectl logs pod --previous
2. Check events: kubectl describe pod
3. Test locally: docker run -it image sh

Resources

• Docker Docs
• Kubernetes Docs