Live backup

[Bron Gondwana]

On Wed, Jun 16, 2010 at 05:19:25PM +0300, Elver Loho wrote:
> Replication looks to be the solution. Surprisingly I hadn't discovered
> it on my own. Many thanks to everyone for pointing it out!
> 
> However, while setting it up, I noticed a really weird thing. When
> authentication fails on the master-initiated master->slave connection,
> master will block connections from all clients! That's a seriously
> weird design choice. Does the same thing happen when the slave goes
> down? For example, if I reboot the slave, is the master mail server
> down for everyone while the slave reboots? I have not dared to
> experiment as when authentication failed and the Cyrus master server
> stopped letting clients connect, everyone in the office started
> shouting within seconds.

What version of cyrus are you using?

I recommend adding the -o flag to sync_client in cyrus.conf (try
ONCE then drop out) - otherwise it keeps trying for roughly 1000
seconds before giving up.  And yes, that's a crazy design decision,
which is why I added the -o flag!

You also need to monitor it a bit to make sure there's still a
sync_client running - because bail outs can cause it to go away.
We run a cron job that checks on the sync clients every 10 minutes
and reports if any are missing - runs sync_client -r -f on the
files left behind by any that have previous died, and generally
keeps things tidy :)

Bron.