Gluster users - Nov 2016 - How to backup GlusterFS metadata in /etc, /var etc.?

Hi!

I'm running a very tiny setup of just two servers, which each host
several gluster bricks in a n=2 replica configuration. Now I want to
reinstall the operating system on one of the hosts without having to
resync all of the volumes afterwards. I found that there's some metadata
outside of the volume bricks, e.g. in /etc/glusterfs, /var/lib/glusterd etc.

Can I/do I have to take a (cold) backup of that metadata before
reinstalling the host OS, so that there's only a small delta to be
synced once the node is up again? If yes, which directories should be
backed up?

Kind regards,
Marius

On Sun, Nov 6, 2016 at 3:19 PM, Marius Bergmann <marius at yeai.de>
wrote:
> Hi!
>
> I'm running a very tiny setup of just two servers, which each host
> several gluster bricks in a n=2 replica configuration. Now I want to
> reinstall the operating system on one of the hosts without having to
> resync all of the volumes afterwards. I found that there's some
metadata
> outside of the volume bricks, e.g. in /etc/glusterfs, /var/lib/glusterd
etc.
>
> Can I/do I have to take a (cold) backup of that metadata before
> reinstalling the host OS, so that there's only a small delta to be
> synced once the node is up again? If yes, which directories should be
> backed up?
>
/var/lib/glusterd holds everything you need, you'll be okay backing up
and restoring it. /etc/glusterfs is installed by the glusterfs
packages and doesn't have anything that changes.
> Kind regards,
> Marius
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