Containers & Orchestration Skill
Overview
Master Docker and Kubernetes for production deployments.
Parameters
| Name | Type | Required | Default | Description |
|---|---|---|---|---|
| platform | string | No | both | docker/kubernetes |
| operation | string | Yes | - | Operation type |
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 1Troubleshooting
Common Failures
| Symptom | Root Cause | Solution |
|---|---|---|
| ImagePullBackOff | Image not found | Verify name, check creds |
| CrashLoopBackOff | Container crashing | Check logs, verify CMD |
| Pending | Cannot schedule | Check resources, selectors |
| OOMKilled | Out of memory | Increase limits |
Debug Checklist
- Pod status:
kubectl get pods -o wide - Events:
kubectl describe pod - Logs:
kubectl logs pod --previous - Resources:
kubectl top pods
Recovery Procedures
CrashLoopBackOff
- Get logs:
kubectl logs pod --previous - Check events:
kubectl describe pod - Test locally:
docker run -it image sh