how to add curr timestamp to while loop in container in pod in kubernetes?

apiVersion: v1
kind: Pod
metadata:
  name: pv-pod
  namespace: auth
spec:
  containers:
  - name: busybox
    image: busybox
    #************** HERE is the command!
    command: ['sh', '-c', 'while true; do echo date > /output/output.log; sleep 5; done']
    volumeMounts:
    - name: pv-storage
      mountPath: /output
  volumes:
  - name: pv-storage
    persistentVolumeClaim:
      claimName: host-storage-pvc

This command is where i need to insert into a file “success! Wed Jun 8 20:28:01 WAST 2022”,i.e. current timestamp.

command: ['sh', '-c', 'while true; do echo success! $date >> /output/output.log; sleep 5; done']

But it keeps writing ‘success date’

Answer

You could use command substitution for this. That would be in shell or bash, the same.

Additionally, you may need to escape the dollar sign, since $() has a special meaning in Kubernetes manifests.

echo "success $$(date)" >> ...