Update to Murder docs (D69) and question on style.
brong at fastmail.fm
Fri Aug 21 04:02:30 EDT 2015
On Fri, Aug 21, 2015, at 17:58, Michael Menge wrote:
> Quoting Nic Bernstein <nic at 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
At which time you'll absolutely want them to both have the same servername!
brong at fastmail.fm
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