[SOLVED] k8s volume mount overwrite

k8s volume mount overwrite

The work directory of my docker image is set to "/opt",and it will contain the jar file and config files,etc. I am trying to mount it pvc in k8s, but find the pvc will overwrite the /opt directory.Is there any way to mount the directory in docker image which is not empty , Thanks.

Solution

When a PVC is mounted to a directory, instead of adding a new file it will overwrite the directory you specify. For your case when the PVC is mounted the directory “/opt” will be replaced. To prevent this you need to create a new directory within the /opt directory or you can mount PVC to a different directory other than the current directory.

apiVersion: v1
kind: PersistentVolumeClaim
metadata:
  name: my-pvc
spec:
  accessModes:
    - ReadWriteOnce
  resources:
    requests:
      storage: 10Gi
  storageClassName: standard
  volumeMode: Filesystem
  volumeName: my-pvc
  mountPath: "/opt/my-pvc"

This YAML will create a new directory named 'my-pvc' within the '/opt' directory and mount the PVC to it. Any files that are already in the '/opt' directory will not be overwritten.

Or else:

mountOptions:
    - path: /mnt

This will mount the PVC to the /mnt directory instead of /opt, so the data in /opt will not be overwritten.

This blog by Iman Tumorang will help you for reference.