Update to Murder docs (D69) and question on style.

Ken Murchison murch at andrew.cmu.edu
Fri Aug 21 07:12:51 EDT 2015

On 08/20/2015 10:26 PM, Nic Bernstein wrote:
> 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.

Right.  We don't even have our replicas as part of our Murder.  They 
replicate their backend as if it were a standalone server.

Kenneth Murchison
Principal Systems Software Engineer
Carnegie Mellon University

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