Cfrgtkky

I'm new with containers and kubernetes.
What I'm trying to do is to create a pod with access to a local directory.

I have followed the directions from:
configure persistent volume storage

Created my Persistent Volume, Persistent Volume Claim and my pod.

The problem is that the tomcat is not able to write on the shared directory

This is the Persistent Volume:

kind: PersistentVolume

apiVersion: v1

metadata:

  name: pv-webapp6

  labels:

    type: local

spec:

  storageClassName: manual

  capacity:

    storage: 3Gi

  accessModes:

    - ReadWriteOnce

  hostPath:

    path: "/opt/test_tomcat/app"

This is the Persistent Volume Claim:

kind: PersistentVolumeClaim

apiVersion: v1

metadata:

  name: pvc-webapp6

spec:

  storageClassName: manual

  accessModes:

    - ReadWriteOnce

  resources:

    requests:

      storage: 1Gi

This is the tomcat Pod I'm trying to create:

apiVersion: v1

kind: Pod

metadata:

  name: webapp6

spec:

  containers:

  - image: tomcat:8.0

    name: webapp6

    ports:

      - containerPort: 8080

        name: webapp6

    volumeMounts:

    - mountPath: /usr/local/tomcat/webapps

      name: test-volume

  volumes:

  - name: test-volume

    persistentVolumeClaim:

      claimName: pvc-webapp6

Its a bit obvious, but this the error on the pod.

[root@testserver webapp6-test]# kubectl exec -it webapp6 -- /bin/bash

root@webapp6:/usr/local/tomcat# mkdir /usr/local/tomcat/webapps/sample

mkdir: cannot create directory ‘/usr/local/tomcat/webapps/sample’: Permission denied

The issue is in your PVC yaml file where you're not specifying the storageClassName. Hence the PV and PVC couldn't bound to each other. Please replace the PVC yaml file with the following file:

kind: PersistentVolumeClaim

apiVersion: v1

metadata:

   name: pvc-webapp6

spec:

   storageClassName: manual

   accessModes:

      - ReadWriteOnce

   resources:

      requests:

         storage: 3Gi

Now everything should work. Hope this helps.

I quickly used your yaml to deploy pod and everything is working fine at my end:

[root@Master admin]# kubectl exec -it webapp6 bash

root@webapp6:/usr/local/tomcat#  mkdir /usr/local/tomcat/webapps/sample 

root@webapp6:/usr/local/tomcat# touch /usr/local/tomcat/webapps/sample/a

root@webapp6:/usr/local/tomcat# ls /usr/local/tomcat/webapps/sample/

a

Now when I look at host, I can see the newly created a file

[root@Master admin]# ls /opt/test_tomcat/app/sample/

a

So, at least yaml files are working fine.