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Using Persistent Volumes

Important

Azure Red Hat OpenShift 3.11 will be retired 30 June 2022. Support for creation of new Azure Red Hat OpenShift 3.11 clusters continues through 30 November 2020. Following retirement, remaining Azure Red Hat OpenShift 3.11 clusters will be shut down to prevent security vulnerabilities.

Follow this guide to create an Azure Red Hat OpenShift 4 cluster. If you have specific questions, please contact us

Overview

A PersistentVolume object is a storage resource in an Azure Red Hat OpenShift cluster. Storage is provisioned by your cluster administrator by creating PersistentVolume objects from sources such as GCE Persistent Disk, AWS Elastic Block Store (EBS), and NFS mounts.

Storage can be made available to you by laying claims to the resource. You can make a request for storage resources using a PersistentVolumeClaim object; the claim is paired with a volume that generally matches your request.

Requesting Storage

You can request storage by creating PersistentVolumeClaim objects in your projects:

Persistent Volume Claim Object Definition
apiVersion: "v1"
kind: "PersistentVolumeClaim"
metadata:
  name: "claim1"
spec:
  accessModes:
    - "ReadWriteOnce"
  resources:
    requests:
      storage: "1Gi"
  volumeName: "pv0001"

Volume and Claim Binding

A PersistentVolume is a specific resource. A PersistentVolumeClaim is a request for a resource with specific attributes, such as storage size. In between the two is a process that matches a claim to an available volume and binds them together. This allows the claim to be used as a volume in a pod. Azure Red Hat OpenShift finds the volume backing the claim and mounts it into the pod.

You can tell whether a claim or volume is bound by querying using the CLI:

$ oc get pvc
NAME        LABELS    STATUS    VOLUME
claim1      map[]     Bound     pv0001

$ oc get pv
NAME                LABELS              CAPACITY            ACCESSMODES         STATUS    CLAIM
pv0001              map[]               5368709120          RWO                 Bound     yournamespace / claim1

Claims as Volumes in Pods

A PersistentVolumeClaim is used by a pod as a volume. Azure Red Hat OpenShift finds the claim with the given name in the same namespace as the pod, then uses the claim to find the corresponding volume to mount.

Pod Definition with a Claim
apiVersion: "v1"
kind: "Pod"
metadata:
  name: "mypod"
  labels:
    name: "frontendhttp"
spec:
  containers:
    -
      name: "myfrontend"
      image: openshift/hello-openshift
      ports:
        -
          containerPort: 80
          name: "http-server"
      volumeMounts:
        -
          mountPath: "/var/www/html"
          name: "pvol"
  volumes:
    -
      name: "pvol"
      persistentVolumeClaim:
        claimName: "claim1"

Volume and Claim Pre-binding

If you know exactly what PersistentVolume you want your PersistentVolumeClaim to bind to, you can specify the PV in your PVC using the volumeName field. This method skips the normal matching and binding process. The PVC will only be able to bind to a PV that has the same name specified in volumeName. If such a PV with that name exists and is Available, the PV and PVC will be bound regardless of whether the PV satisfies the PVC’s label selector, access modes, and resource requests.

Example 1. Persistent Volume Claim Object Definition with volumeName
apiVersion: "v1"
kind: "PersistentVolumeClaim"
metadata:
  name: "claim1"
spec:
  accessModes:
    - "ReadWriteOnce"
  resources:
    requests:
      storage: "1Gi"
  volumeName: "pv0001"

The ability to set claimRefs is a temporary workaround for the described use cases. A long-term solution for limiting who can claim a volume is in development.

You may also want your cluster administrator to "reserve" the volume for only your claim so that nobody else’s claim can bind to it before yours does. In this case, the administrator can specify the PVC in the PV using the claimRef field. The PV will only be able to bind to a PVC that has the same name and namespace specified in claimRef. The PVC’s access modes and resource requests must still be satisfied in order for the PV and PVC to be bound, though the label selector is ignored.

Persistent Volume Object Definition with claimRef
apiVersion: v1
kind: PersistentVolume
metadata:
  name: pv0001
spec:
  capacity:
    storage: 1Gi
  accessModes:
  - ReadWriteOnce
  nfs:
    path: /tmp
    server: 172.17.0.2
  persistentVolumeReclaimPolicy: Retain
  claimRef:
    name: claim1
    namespace: default

Specifying a volumeName in your PVC does not prevent a different PVC from binding to the specified PV before yours does. Your claim will remain Pending until the PV is Available.

Specifying a claimRef in a PV does not prevent the specified PVC from being bound to a different PV. The PVC is free to choose another PV to bind to according to the normal binding process. Therefore, to avoid these scenarios and ensure your claim gets bound to the volume you want, you must ensure that both volumeName and claimRef are specified.

You can tell that your setting of volumeName and/or claimRef influenced the matching and binding process by inspecting a Bound PV and PVC pair for the pv.kubernetes.io/bound-by-controller annotation. The PVs and PVCs where you set the volumeName and/or claimRef yourself will have no such annotation, but ordinary PVs and PVCs will have it set to "yes".

When a PV has its claimRef set to some PVC name and namespace, and is reclaimed according to a Retain reclaim policy, its claimRef will remain set to the same PVC name and namespace even if the PVC or the whole namespace no longer exists.