Charts: [jenkins] is there a way to persist jenkins data without a PVC?

[pswenson]

Is this a request for help?:

is there a way to configure the jenkins chart to store data in a host volume rather than a persistent volume claim? We use openstack w/o persistent vol claim support.

Version of Helm and Kubernetes:

1.5.6k8s, 2.5.0helm

Which chart:

jenkins

[fabiormoura]

Hi @pswenson,

You need to create a PersistentVolume with hostPath and storageClassName separately and let the Jenkins chart create the PVC for you. Hope the example below helps you out.

Create a PersistentVolume with a storageClassName and hostPath before deploying the Jenkins chart

kind: PersistentVolume
apiVersion: v1
metadata:
  name: jenkins-pv
spec:
  storageClassName: jenkins-pv
  capacity:
    storage: 8Gi
  accessModes:
    - ReadWriteOnce
  persistentVolumeReclaimPolicy: Retain
  hostPath:
    path: "/mnt/k8s_volume/jenkins_home"

Deploy the Jenkins chart with these overrides

Persistence:
  Enabled: true
  # Use the same storage class defined in the PersistentVolume 
  StorageClass: jenkins-pv
  Size: 8Gi

[pswenson]

Thanks. I tried deploying this:

kind: PersistentVolume
apiVersion: v1
metadata:
  name: jenkins-pv
spec:
  selector:
      jenkins: master
  storageClassName: jenkins-pv
  capacity:
    storage: 90Gi
  accessModes:
    - ReadWriteOnce
  persistentVolumeReclaimPolicy: Retain
  hostPath:
    path: "/data/jenkins"

but get this error:

kubectl create -f ./jenkins-pv.yaml
error: error validating "./jenkins-pv.yaml": error validating data: [found invalid field selector for v1.PersistentVolumeSpec, found invalid field storageClassName for v1.PersistentVolumeSpec]; if you choose to ignore these errors, turn validation off with --validate=false

I'm reading up on persistent volumes and storage class names but most doc assumes AWS or GCE.

[pswenson]

I just removed the storageClassName and selector like

kind: PersistentVolume
apiVersion: v1
metadata:
  name: jenkins-pv
spec:
#  selector:
#      jenkins: master
#  storageClassName: jenkins-pv
  capacity:
    storage: 90Gi
  accessModes:
    - ReadWriteOnce
  persistentVolumeReclaimPolicy: Retain
  hostPath:
    path: "/data/jenkins"

the PV was created... now seeing if I can actually get it to work with the chart...

[pswenson]

No dice.... I think this is the problem (from k8s doc): HostPath (single node testing only – local storage is not supported in any way and WILL NOT WORK in a multi-node cluster)

see https://kubernetes.io/docs/concepts/storage/persistent-volumes/#types-of-persistent-volumes

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