[K8S] 컨테이너에 command 실행 적용하기 (while문, tail 명령어, sleep 명령어 등)

apiVersion: v1
kind: Pod
metadata:
  creationTimestamp: null
  labels:
    run: multi-container
  name: multi-container
spec:
  containers:
  - image: busybox:1.31.1
    name: c1
    command: ["sh", "-c", "while true; do date >> /vol/date.log; sleep 1; done"]
    volumeMounts:
    - name: vol
      mountPath: /vol
  - image: busybox:1.31.1
    name: c2
    command: ["sh", "-c", "tail -f /vol/date.log"] 
    volumeMounts:                          
    - name: vol 
      mountPath: /vol 
  dnsPolicy: ClusterFirst
  restartPolicy: Always
  volumes:
    - name: vol
      emptyDir: {}
status: {}

apiVersion: v1
kind: Pod
metadata:
  labels:
    run: sleep-pod
  name: sleep-pod
  namespace: default
spec:
  containers:
  - image: nginx:1.21.3-alpine
    name: nginx
  - image: busybox:1.31
    name: bb
    command: ["sh", "-c", "sleep 1d"] 
    resources: {}
  dnsPolicy: ClusterFirst
  restartPolicy: Always
status: {}