Utiliser du stockage persistent via des PV
==========================================

La StorageClass **ceph-rbd** est utilisable (dans la limite du quota de votre namespace) afin de créer des PVC ou des Statefulsets.

Le stockage en block permet de meilleures performances, et peut être utilisé directement en mode block ou monté en tant que filesystem dans le pod.

Exemple avec un `Statefulset <https://kubernetes.io/docs/concepts/workloads/controllers/statefulset/>`_ :

.. code-block::

    apiVersion: apps/v1
    kind: StatefulSet
    metadata:
      name: gimme-data
      labels:
        app: stateful
    spec:
      replicas: 1
      persistentVolumeClaimRetentionPolicy:
        whenDeleted: Delete
        whenScaled: Delete
      selector:
        matchLabels:
          app: stateful
      template:
        metadata:
          labels:
            app: stateful
        spec:
          containers:
          - name: test
            image: docker.io/busybox:1.36.1
            command: ["/bin/sh","-c","echo running; touch /mnt/RBD-SUCCESS; sleep 3600"]
            resources:
              requests:
                memory: "64Mi"
                cpu: "250m"
              limits:
                memory: "128Mi"
                cpu: "500m"
            livenessProbe:
              exec:
                command:
                - ls
            volumeMounts:
              - name: mypvc
                mountPath: "/mnt"
      volumeClaimTemplates:
        - metadata:
            name: mypvc
          spec:
            accessModes: [ "ReadWriteOnce" ]
            storageClassName: "ceph-rbd"
            resources:
              requests:
                storage: 1Gi



Exemple avec un `PVC <https://kubernetes.io/docs/concepts/storage/persistent-volumes/>`_ et un pod :

.. code-block::

    apiVersion: v1
    kind: PersistentVolumeClaim
    metadata:
      name: ceph-rbd-claim-test
    spec:
      accessModes:
        - ReadWriteOnce
      resources:
        requests:
          storage: 1Gi
      storageClassName: ceph-rbd
    ---
    kind: Pod
    apiVersion: v1
    metadata:
      name: rbd-test-pod
    spec:
      containers:
      - name: rbd-test-pod
        image: busybox:1.36.1
        command:
          - "/bin/sh"
        args:
          - "-c"
          - "touch /mnt/RBD-SUCCESS; sleep 3600"
        resources:
          requests:
            memory: "64Mi"
            cpu: "250m"
          limits:
            memory: "128Mi"
            cpu: "500m"
        volumeMounts:
          - name: pvc
            mountPath: "/mnt"
      restartPolicy: "Never"
      volumes:
        - name: pvc
          persistentVolumeClaim:
            claimName: ceph-rbd-claim-test