• k8s
• StudyNotes
• cubectl

k8s/StudyNotes/cubectl cli commands

• cubectl Imperative commands
  • Create Objects
    • run, create, expose pod,
  • Update Objects
    • edit, scale, set image,
  • Using files
    • create -f, replace -f, delete -f
• cubectl Declarative
  • apply -f /path/to/config-files
• cubectl tips
  • --dry-run=client
  • -o yaml

• Task: create yaml template for pod name Redis, with image Redis123

  kubectl run redis --image=redis123 --labels=tier=db --dry-run=client -o yaml > redis.yaml
  # Note: add ''--expose'' & ''--port 6234'' to create service in same run

• After deploying ReplicaSet rs-myapp.yml scale from current 3 to 6

  kubectl scale --replicas=6 -f rs-myapp.yml

• Get all objects at once

  kubectl get all

• Switch away from default namespace

  kubectl config set-context $(kubectl config current-context) --namespace=dev

• Create a service to a pod (Grab selector from deployment)

  kubectl expose deployment simple-webapp-deployment --name=webapp-service --port=8080 --target-port=8080 --type=NodePort --dry-run -o yaml > svc.yaml

• cubectl apply

  • considers local file + LastApplied(In annotation) + Kubernetes