Kubernetes commands

• Get pods: kubectl get pods -A
• Get services: kubectl get services -A
• Force delete the pod: kubectl delete pods POD_NAME --grace-period=0 --wait=false --force=true
• Delete service: kubectl delete services SERVICE_NAME --namespace NAMESPACE
• Apply YAML file: kubectl apply -f PATH_TO_CONFIG.yaml
• Delete using YAML file: kubectl delete -f PATH_TO_CONFIG.yaml
• Restart the pods: kubectl rollout restart deployment -n NAMESPACE DEPLOYMENT_NAME
• Copy with multiple retries: kubectl cp --retries=-1 POD_NAME:PATH_INSIDE_POD PATH_ON_HOST
  • fixes following issue

  Dropping out copy after 0 retries
  error: unexpected EOF
  

Local development

• Development with local container image:
  • set imagePullPolicy as Never
  • in deployment.yaml : imagePullPolicy: Never

Non frequent commands

• Copy: kubectl cp LOCAL_PATH NAMESPACE/POD_NAME:PATH_IN_POD
  • use -c argument for specific container

Exec into certain container

• kubectl exec -it POD_NAME -C CONTAINER_NAME -- SHELL

Drain node

• kubectl drain NODE_ID
• will remove all the pod, and other resources from the node, add --force to force the removal

Port Forward

• kubectl port-forward pods/POD_NAME PORT_IN_LOCAL:PORT_IN_KUBE -n NAMESPACE
• kubectl port-forward deployment/DEPLOYMENT_NAME PORT_IN_LOCAL:PORT_IN_KUBE -n NAMESPACE
• kubectl port-forward replicaset/REPLICA_SET_NAME PORT_IN_LOCAL:PORT_IN_KUBE -n NAMESPACE
• kubectl port-forward service/SERVICE_NAME PORT_IN_LOCAL:PORT_IN_KUBE -n NAMESPACE

Kill exec ¹

• kill -9 $(pidof kubectl)
• Add request timeout : --request-timeout=<value>

Related docs

• Web UI
• Taints and toleration's
• Storage Class
• Stateful Sets
• Services
• Service Discovery
• Secrets
• Resource Quota
• Replicas
• Pods
• Pod Presets
• Operators
• Metrics Server
• Labels
• Ingress
• Health Checks & Readiness Probe
• Deployments
• Daemon Set
• CRD (Custom Resource Definitions)
• Config Map
• Auto Scaling
• Affinity, Anti Affinity and Node Selector
• Misc kubernetes topics
• Helm
• Minikube
• Kubernetes Operator

References:

1. linux - How can I use local Docker images with Minikube? - Stack Overflow
2. Copy directories and files to and from Kubernetes Container [POD] | by Nilesh Suryavanshi | Medium