Using persistent storage in pods

Previously, we created all required PV OpenShift API objects, which are provided by OpenStack cluster administrators. Now, we are going to show you how to use persistent storage in your applications. Any OpenShift users can request persistent volume through the PVC concept.

Requesting persistent volume

Once the PV resource is available, any OpenShift user can create a PVC to request storage and later use that PVC to attach it as a volume to containers in pods.

Note

Upcoming examples don't have to be run under the system:admin account. Any unprivileged OpenShift user can request persistent volumes using PVC.

Users should create PVC definitions using either YAML or JSON syntax. The following example shows a claim that requests 1 GiB of persistent storage with ReadWriteOnce capabilities:

# cat pvc-db.yaml
apiVersion: v1
kind: PersistentVolumeClaim
metadata:
  name: pvc-db 
spec:
  accessModes:
  - ReadWriteOnce 
  resources:
     requests:
       storage: 1Gi 

Now...