[Gluster-users] Reinstall OS while keeping bricks intact

Prasun Gera prasun.gera at gmail.com
Thu Jul 30 09:17:46 UTC 2015

Also, if there is a cleaner way of doing this by removing and adding the
node again through gluster commands that would be preferable.

On Thu, Jul 30, 2015 at 1:58 AM, Prasun Gera <prasun.gera at gmail.com> wrote:

> Hi,
> One of my nodes in an RHS 3.0 3x2 dist+replicated pool is down and not
> likely to recover. The machine doesn't have IPMI and I have limited access.
> Standard steps to recover it didn't work, and at this point the easiest
> option seems to get help in reinstalling the OS. I believe that the brick
> and other config files are intact. From RHS documentation on upgrading from
> an ISO, this is what I got:
> 1. Backup (/var/lib/glusterd, /etc/swift, /etc/samba, /etc/ctdb,
> /etc/glusterfs. /var/lib/samba, /var/lib/ctdb) . Backup entire /etc for
> selective restoration.
> 2. Stop the volume and all services everywhere. Install the OS on the
> affected node without touching the brick. Stop glusterd on this node too.
> 3. Backup /var/lib/glusterd from the newly installed OS.
> 4. Copy back /var/lib/glusterd and /etc/glusterfs from step 1. to the
> newly installed OS.
> 5. Copy back the latest hooks scripts (from step 3) to
> /var/lib/glusterd/hooks. This is probably not required since the steps were
> written for an upgrade whereas my version is the same. Right ?
> 6. glusterd --xlator-option *.upgrade=yes -N. Is this needed in my case ?
> It's not an upgrade.
> 7. Restart services and volume.
> Do these steps sound all right ? Should I also restore /etc/nagios ? Or
> would nagios have to be reconfigured for the entire cluster ?
> The reason for this failure was a botched kernel upgrade and a combination
> of some other factors which i'm not sure yet. And I wasn't able to generate
> working initramfs using dracut in recovery. Interestingly, I noticed the
> following line in the new RHS 3.1 documentation. "If dracut packages are
> previously installed, then exclude the dracut packages while updating to
> Red Hat Gluster Storage 3.1 during offline ISO update using the following
> command:
> # yum update -x dracut -x dracut-kernel" . Is there some sort of a known
> issue ?
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