If your Ceph cluster is already configured with CephFS, then you can assign it very easily to pods. Also, CephFS supports ReadWriteMany access modes.

The configuration is similar to Ceph RBD, except you don't have a pool, image, or filesystem type. The secret can be a reference to a Kubernetes secret object (preferred) or a secret file:

apiVersion: v1
kind: Pod
metadata:
  name: cephfs
spec:
  containers:
  - name: cephfs-rw
    image: kubernetes/pause
    volumeMounts:
    - mountPath: "/mnt/cephfs"
      name: cephfs
  volumes:
  - name: cephfs
    cephfs:
      monitors:
      - 10.16.154.78:6789
      - 10.16.154.82:6789
      - 10.16.154.83:6789
      user: admin
      secretFile: "/etc/ceph/admin.secret"
      readOnly: true

You can also provide a path as a parameter in the cephfs system. The default is /.

The in-tree RBD provisioner has an out-of-tree copy in the external-storage Kubernetes incubator project.