Configuring image mirroring

Image mirroring can be used when you choose to only want to mirror a specific subset of images and not an entire pool. The next recipe we will enable mirroring on a single image in the data pool and not mirror the other two images in the pool. This recipe requires you to have completed step 1 - step 9 in Disaster recovery replication using RBD mirroring recipe and have rbd-mirror running on backup site:

How to do it...

1. Create three images in the ceph cluster as we did in the previous recipe:

       # rbd create image-1 --size 1024 --pool data 
         --image-feature exclusive-lock,journaling

2. Enable image mirroring on the data pool on the ceph and backup clusters:

        # rbd mirror pool enable data image

3. Add ceph cluster as a peer to backup cluster:

         root@ceph-node5 # rbd mirror pool peer add 
                           data client.local@ceph

4. Validate that peer is successfully added:

        # rbd mirror pool info

5. In the ceph cluster, enable image mirroring...