Kubernetes useful commands

kubernetes_useful_commands.txt

### List all pods from all namespaces in current cluster
kubectl get pods --all-namespaces

### Get info about specific pod
kubectl describe pods --namespace pod-name pod-id

### SSH to a pod
kubectl exec -it -n insert_namespace_here -c web insert_pod_name_here -- bash

### Investigate CrashLoopBackOff state by finding previous container logs
kubectl logs -n insert_namespace_here -c web insert_pod_name_here -p

### Open rails console on pod
kubectl exec -it -n insert_namespace_here -c web insert_pod_name_here -- rails c

### Run pending migrations on pod
kubectl exec -it -n insert_namespace_here -c web insert_pod_name_here -- rake db:migrate

Delete Namespace:
kubectl delete namespace insert_namespace_name_here

### Delete all Evicted pods from all namespaces from current cluster
kubectl get pods --all-namespaces -o json | jq '.items[]| select(.status.reason=="Evicted") | "kubectl delete pod \(.metadata.name) -n \(.metadata.namespace)"' | xargs -n 1 bash -c

### Delete pods
kubectl delete pods -n namespace_name pod_name