02-namespace

Namespace

1. Create and delete namespace with yaml file.

   Create:

   kubectl apply -f namespace-test.yaml
   

   Check:

   kubectl get namespace
   

   Delete:

   kubectl delete -f namespace-test.yaml
   

2. Create and delete namespace with only command.

   kubectl create namespace test-with-kubectl-create
   

   kubectl delete ns test-with-kubectl-create
   

3. Create yaml file for namespace team-a and team-b.

   1. team-a: Create manually by filling apiVersion, kind, and metadata.

   2. team-b: Create with kubectl create command

   kubectl create ns team-b --dry-run=client -o yaml > ns-team-b.yaml
   

4. Create namespaces

   kubectl apply -f ns-team-a.yaml,ns-team-b.yaml
   

5. Check namespaces

   kubectl get ns
   

6. Create pod in team-a

   kubectl run nginx --image=nginx -n team-a
   

   check:

   kubectl get pod
   

   kubectl get pod -n team-a
   

7. Create pod with the same name in team-a

   kubectl run nginx --image=nginx -n team-a
   

   -> Will fail with an error: Error from server (AlreadyExists): pods "nginx" already exists

8. Create pod with the same name in team-b

   kubectl run nginx --image=nginx -n team-b
   

9. Check pods in all namespaces

   kubectl get pod --all-namespaces
   

10. Delete namespace team-a

    kubectl delete ns team-a
    

    -> the pod in namespace team-a is also deleted.

    kubectl get pod --all-namespaces
    

11. Delete namespace team-b

    kubectl delete ns team-b
    

    kubectl get pod --all-namespaces
    

    Everything is deleted.