Kubernetes PVC deleting the contents of the POD

Question

I have a Kubernetes POD running and I have attached a PVC to it. The PVC volume is /opt/stackstorm.

By default, there are certain files inside the /opt/stackstorm which comes as part of the docker official image. These files are visible when there is no PVC attached to the POD.

But when a PVC is attached, the files are replace and a lost&found directory is created.

How we can retain the directory even after attaching the PVC ?

I have changed directories for the PVC. When I change the directory from opt/stackstorm to /opt/stack then /opt/stackstorm has all the details but /opt/stack becomes empty.

So the PVC when attached to a POD is creating issue.

pvc.yaml:

kind: PersistentVolumeClaim
apiVersion: v1
metadata:
  name: stacke
  annotations:
    volume.beta.kubernetes.io/storage-class: "ebs"
spec:
  accessModes:
    - ReadWriteOnce
  resources:
    requests:
      storage: 3Gi

deployment.yaml:

       volumeMounts:
          - name: stacke
            mountPath: /opt/stackstorm
      volumes:
      - name: stacke
        persistentVolumeClaim:
          claimName: stacke
      imagePullSecrets:
      - name: regcred

expected results is that /opt/stackstorm should have all the files as part of the image.

Answer 1

you can copy the the content of /opt/stackstorm to a new directory in dockerfile and build a new image . After that you can copy the content of the new directory back to /opt/stackstorm in run time. All of this issue occurred because this directory get initialized in build time . For copying in run time you can use postStart in container lifecycle in kubernetes . for example : spec: containers: - name: .... image: .... lifecycle: postStart: exec: command: ["cp" , "-r" , "/test/" ,"/opt/stackstorm"] this command run after the container start . but this approach copy every time the pod start , if you want to avoid this you can delete the content of the /opt/stackstorm in dockerfile in build time and then in postStart command write the script to check if this dir is empty do copying . And you can have /opt/stackstorm as mountPath and attach a pvc to it just like you have done.