> -----Original Message----- > From: Infos E-Blokos [mailto:in...@e-blokos.com] > Sent: Thursday, May 21, 2009 9:16 AM > To: pacema...@clusterlabs.org > Subject: Re: [Pacemaker] globally-unique clone question > > > ----- Original Message ----- > From: "Eliot Gable" <ega...@broadvox.net> > To: "pacemaker@oss.clusterlabs.org" <pacema...@clusterlabs.org>; > "JoeArmstrong" <jarmstr...@postpath.com> > Sent: Thursday, May 21, 2009 11:39 AM > Subject: Re: [Pacemaker] globally-unique clone question > > > > The typical usage in this case would be to make all mail servers > serve all > > domains (virtual domain support) and then run N instances across > those N > > servers. Then there is no per-server unique information to deal with. > Then > > you can run, for example, load sharing between the nodes using > iptables > > CLUSTERIP (since all nodes would then be serving the same data) and > put a > > constraint in the CIB that says that if the clone fails on a node, > pull > > that node from the load-sharing config by stopping or moving away > your > > load-sharing resource. At least, that's how I would do it. > > > > > > Eliot Gable > > Senior Engineer > > 1228 Euclid Ave, Suite 390 > > Cleveland, OH 44115 > > > > Direct: 216-373-4808 > > Fax: 216-373-4657 > > ega...@broadvox.net > > > > > > CONFIDENTIAL COMMUNICATION. This e-mail and any files transmitted > with it > > are confidential and are intended solely for the use of the > individual or > > entity to whom it is addressed. If you are not the intended > recipient, > > please call me immediately. BROADVOX is a registered trademark of > > Broadvox, LLC. > > > > -----Original Message----- > > From: Joe Armstrong [mailto:jarmstr...@postpath.com] > > Sent: Thursday, May 21, 2009 11:04 AM > > To: pacemaker@oss.clusterlabs.org > > Subject: [Pacemaker] globally-unique clone question > > > > Hi All, > > > > I am a little confused about globally-unique clones, since there can > be no > > instance attributes for a clone how do you tell each clone that it is > > unique ? > > > > My use case is that we need to run N instances of a mail server, each > mail > > server is unique in that it serves a specific domain, two mail server > can > > never run on the same host. In order to provide HA we need to tell > the > > mail server instance what domain to serve (or what filesystem to > mount in > > order to get the right data/config). > > > > I was thinking that using globally-unique clones would be the way to > > manage this (it makes the mutual exclusion rule easy: clone-node- > max=1) > > but I don't see how to make each instance unique. > > > > ... then again I could be mis-using the concept... > > > > Thanks for any pointers. > > > > Joe > > > > > I agree, the same for apache and postgresql with DRBD >
Unfortunately this is not possible due to the underlying database the mail server uses - but thanks for the idea anyway. So back to the original problem - am I mis-using the globally-unique clone concept ? Thanks. Joe _______________________________________________ Pacemaker mailing list Pacemaker@oss.clusterlabs.org http://oss.clusterlabs.org/mailman/listinfo/pacemaker
