Kubernetes Persistent Volumes

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Persistent Volumes in Kubernetes allow the operators to store data outside the Pods that will be persistent across updates or reboot. It also allows these Persistent Volumes to be mounted on multiple pods.
See the official Kubernetes documentation on Persistent Volumes for more information. 

Contents

Using Kubernetes Persistent Volumes

  1. In order to use Persistent Volumes, you must declare a PersistentVolumeClaim in order to request some space.

    apiVersion: v1
    kind: PersistentVolumeClaim
    metadata:
      name: example-pvc
    spec:
      storageClassName: cloudstack-custom
      accessModes:
        - ReadWriteOnce
      resources:
        requests:
          storage: 1Gi

    The only part which is special here is "cloudstack-custom" which is a pre-defined storage class declared by Leaseweb when we have provisioned your cluster.
    The other interesting part is the spec.resources.requests.storage which requests exactly 1 Gi for the volume, which allows choosing the specific size you desire for that volume.

  2. Then, to use this PersistentVolume in a container, you can use the PersistentVolume's name to specify in your Pod, such as : 

    apiVersion: v1
    kind: Pod
    metadata:
      name: example-pod
    spec:
      containers:
        - name: example
          image: busybox
          volumeMounts:
            - mountPath: "/data"
              name: example-volume
          stdin: true
          stdinOnce: true
          tty: true
      volumes:
        - name: example-volume
          persistentVolumeClaim:
            claimName: example-pvc
  3. Once you have applied both of these configurations using kubectl apply -f, a new pod will be added, and the volume will be mounted under /data.

Relevant documentation about Kubernetes Persistent Volumes

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