Jenkins (copy_reference_file.log Permission denied) issue in K8s

when you Trying to run the default Jenkins image (or jenkinsci/jenkins) with a persistent volume mounted (nfs) to /var/jenkins_home will currently fail:

[email protected]:/etc/kubernetes# kubectl logs jenkins-7786b4f8b6-cqf6q

touch: cannot touch '/var/jenkins_home/copy_reference_file.log': Permission denied

Can not write to /var/jenkins_home/copy_reference_file.log. Wrong volume permissions?

Above error can be fixed by adding securityContext in Jenkins Deployment.

apiVersion: v1
kind: Service
metadata:
  name: jenkins
spec:
  type: NodePort
  ports:
    - port: 8080
      targetPort: 8080
  selector:
    app: jenkins
---
apiVersion: extensions/v1beta1
kind: Deployment
metadata:
  name: jenkins
spec:
  replicas: 1
  template:
    metadata:
      labels:
        app: jenkins
    spec:
      securityContext:
        fsGroup: 1000 
        runAsUser: 0
      containers:
        - name: jenkins
          image: jaganthoutam/jenkins:2.0
          ports:
            - name: httpport
              containerPort: 8080
            - name: jnlpport
              containerPort: 50000
          volumeMounts:
            - name: nfs-jenkins
              mountPath: "/var/jenkins_home"
      volumes:
      - name: nfs-jenkins
        persistentVolumeClaim:
          claimName: nfs-jenkins
---
apiVersion: v1
kind: PersistentVolumeClaim
metadata:
  name: nfs-jenkins
spec:
  accessModes:
    - ReadWriteMany
  resources:
    requests:
      storage: 20Gi
---
apiVersion: v1
kind: PersistentVolume
metadata:
  name: nfs-jenkins
spec:
  capacity:
    storage: 20Gi
  accessModes:
    - ReadWriteMany
  nfs:
    server: nfs01.thoutam.loc
    # Exported path of your NFS server
    path: "/mnt/jenkins"
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