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Learning Ceph - Second Edition by Karan Singh, Vaibhav Bhembre, Anthony D'Atri

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RADOS Block Device Snapshots

Ceph supports the ability to take snapshots of RBD images and then use them at a later time. RBD snapshots are point-in-time, read-only copies of their respective RBD images. They are very useful if you wanted to go back in history to a time where you know your image was in a desirable state. A typical use-case for snapshots is backing up an image's state before running an application that has a chance of corrupting data. If the new application destroys your data, you can roll back time by reverting to the snapshot that you took before the destruction took place.

In order to see how a Ceph snapshot works and how to harness its functionality, let us create a file on our currently mounted RBD image and write some ...

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