basic: run a simple pod.md

tags: kubernetes, cli

run a simple pod

You can deploy an application easily from command line, like:

$ kubectl create deployment echo --image=busybox -- sh -c \
    'for i in $(seq 50);do sleep 2 && echo date: $(date +"%Y-%m-%d_%H_%M_%S");done'

You can also write a simple yaml config like following:

---
apiVersion: v1
kind: Pod
metadata:
  name: demo1-pod
spec:
  containers:
    - name: demo1
      image: debian:10
      imagePullPolicy: Always
      command: ["echo"]
      args: ["hello", "world"]
  restartPolicy: Never

And you can create this simple pod using kubectl:

$ kubectl --kubeconfig xxx.kubeconfig create --namespace dev -f pod.yml

You can delete it using kubectl:

$ kubectl --kubeconfig xxx.kubeconfig delete --namespace dev -f pod.yml

debug interactively

You can run the pod using command like sleep 1000 and then use kubectl exec to run commands or debug interactively.

      image: debian:10
      command: ["sleep"]
      args: ["1000"]

$ kubectl --kubeconfig xxx.kubeconfig --namespace dev exec demo1-pod -c demo1 -- echo dfdfdd

If your pod has only one container, you can ignore the -c container_name:

$ kubectl --kubeconfig xxx.kubeconfig --namespace dev exec demo1-pod -- echo dfdfdd

You can also get an interactive shell using exec -it:

$ kubectl --kubeconfig xxx.kubeconfig --namespace dev exec -it demo1-pod -- /bin/bash

references

• kubernetes command reference