March 2019
Intermediate to advanced
356 pages
10h 7m
English
Content preview from Mastering Ceph - Second Edition
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Recovering from a complete monitor failure
In the unlikely event that you lose all of your monitors, all is not lost. You can rebuild the monitor database from the contents of the OSDs with the use of ceph-objectstore-tool.
To set the scenario, we will assume that an event has occurred and has corrupted all three monitors, effectively leaving the Ceph cluster inaccessible. To recover the cluster, we will shut down two of the monitors and leave a single failed monitor running. We will then rebuild the monitor database, overwrite the corrupted copy, and restart the monitor to bring the Ceph cluster back online.
The objectstore tool needs to be able to access every OSD in the cluster to rebuild the monitor database; in this example, we will ...
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I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.