Ceph Cookbook

Working with RBD snapshots

Ceph extends full support to snapshots, which are point-in-time, read-only copies of an RBD image. You can preserve the state of a Ceph RBD image by creating snapshots and restoring the snapshot to get the original data.

How to do it…

Let's see how a snapshot works with Ceph.

1. To test the snapshot functionality of Ceph, let's create a file on the block device that we created earlier:

   # echo "Hello Ceph This is snapshot test" > /mnt/ceph-disk1/snapshot_test_file

   
2. Create a snapshot for the Ceph block device:

   Syntax: rbd snap create <pool-name>/<image-name>@<snap-name>

   # rbd snap create rbd/rbd1@snapshot1 --name client.rbd
   

3. To list ...