Data Recovery
With Ceph's RBD snapshots, we are able to restore RBD images to previous states in order to recover data.
On a Ceph admin node, (substitute
<IMAGE NAME> with the appropriate image path e.g. virtual-machines/steeltoe)- 1.find the appropriate image by running
rbd ls - 2.list all the image's snapshots by running
rbd snap ls <IMAGE NAME>and gain information about the image withrbd info <IMAGE NAME> . - 3.disable necessary features with
rbd feature disable <IMAGE NAME> object-map fast-diff - 4.enable layering for RBD copy-on-write (http://docs.ceph.com/docs/master/dev/rbd-layering/) with
rbd feature enable <IMAGE NAME> layering - 5.using the image snapshot name obtained in step 2
For example to restore an image named
virtual-machines/steeltoe from the snapshot 20190108 :rbd feature disable virtual-machines/steeltoe object-map fast-diff
cd /mnt
mkdir steeltoe
rbd map virtual-machines/[email protected]
mount /dev/rbd/virtual-machines/[email protected] /mnt/steeltoe
# Obtain the necessary files from /mnt/steeltoe
umount /mnt/steeltoe
rbd unmap virtual-machines/steeltoe
rbd feature enable virtual-machines/steeltoe object-map fast-diff
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