Hi,
Quoting Nic Bernstein <n...@onlight.com>:
On 08/20/2015 09:07 PM, Bron Gondwana wrote:
On Fri, Aug 21, 2015, at 11:42, Nicola Nye wrote:
On Fri, Aug 21, 2015, at 11:35 AM, Bron Gondwana wrote:
Murder plus replication is a giant ball of suck right now. They
don't know about each other, and they interact badly :(
So is that a case for documenting "Here be dragons, enter at your
own risk" for the moment?
Does it mean that admins should look at other backup mechanisms to
handle failover and redundancy in a murder environment, because
Cyrus's replication doesn't play nicely with murder?
Or... ?
Or we need to fix murder and replication to work together nicely,
but that's hard work[tm].
Ahem, some of us run Murderous Replicas all day long and it works
well enough... Doesn't it? ;-)
I can write this up, I just wasn't sure if it was still needed. I
put a big ol' Note: in the replication page saying:
Important
Within a Cyrus /Murder/
<https://docs.cyrus.foundation/imap/developer/architecture.html#architecture-murder>
environment, replicas must *not* be configured to invoke
ctl_mboxlist(8)
<http://docs.cyrus.foundation/imap/admin/commands/ctl_mboxlist.html>
on startup (pushing the local mailbox list to the *Mupdate Master*).
This may only be done on the Master instance.
That's the only real gotcha I know of, but, having said that, I did
write up a brief set of instructions about this very topic not that
long ago (IIRC) for user mailing list. I figured I could start with
that.
For the initial configuration I second this. But there are IHMO things
to consider on failover.
1. ctl_mboxlist must be used with -m and -a Option on failover
2. on big installations updating all entries in mailbox.db on the
mupdate server can take some time, on our setup we switch the IP address
of master and replic on failover
Regards
Michael
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