/k8s-examples

General

  • kubectl get pods
  • kubectl get namespace
  • kubectl get pods --all-namespaces
  • kubectl get pods --show-labels
  • kubectl describe pod nginx -n nginx-ns (e.g. image tag wrong)
  • kubectl edit pod nginx -n nginx-ns

Delete and re-create

  • kubectl get pod nginx -n nginx-ns -o yaml --export > nginx-pod.yml
  • kubectl delete pod nginx -n nginx-ns
  • kubectl apply -f nginx-pod.yml -n nginx-ns

Label selectors

  • kubectl get pods -l app=my-app
  • kubectl get pods -l environment=production
  • kubectl get pods -l environment=development
  • kubectl get pods -l environment!=production
  • kubectl get pods -l 'environment in (development,production)'
  • kubectl get pods -l app=my-app,environment=production

Deployments

  • kubectl get deployments
  • kubectl get deployment {deployment name}
  • kubectl describe deployment {deployment name}
  • kubectl edit deployment {deployment name}
  • kubectl delete deployment {deployment name}

Rolling updates

  • kubectl set image deployment/rolling-deployment nginx=nginx:1.7.9 --record
  • kubectl rollout history deployment/rolling-deployment
  • kubectl rollout history deployment/rolling-deployment --revision=2
  • kubectl rollout undo deployment/rolling-deployment
  • kubectl rollout undo deployment/rolling-deployment --to-revision=1

Batch

  • kubectl get jobs
  • kubectl get cronjobs

Services

  • kubectl get svc
  • kubectl get endpoints my-service

Network Policy

  • kubectl get networkpolicies
  • kubectl describe networkpolicy my-network-policy
  • kubectl get pod network-policy-secure-pod -o wide
  • kubectl exec network-policy-client-pod -- curl {secure pod cluster ip address}