Hi, On 18.04.2013 11:24, Janne Peltonen wrote: > Hi! > > On Thu, Apr 18, 2013 at 10:45:03AM +0200, Sven Schwedas wrote: >> If I understand correctly, failover is simply done by pointing clients >> to the replica (e.g. moving public IP)? > > More or less. You'll also have to make sure sync_server is no longer running on > the replica but all the other relevant services are, so that users can connect. > >> We can assume that only one server is ever accessed by clients (both >> IMAP and SMTP/LMTP), they only have access to the public IP, which is >> switched over manually. > > Ok. But as an added security measure, you should still make sure that the > sync_server isn't running on the replica-as-master. (And sync_client shouldn't > be running on the original master.) Ah, okay. >> How do I then migrate the data over to the master once it's running again? >> • Is master-master replication possible in this case? > > I gather it is only supported in the forthcoming 2.5 release. Too bad. :( > >> • If not, how do I move the data back to the master? Shut down the >> replica and rsync the spool back to the master? > > You could do that, I guess, but that would result in quite a downtime. We > simply run the master as the replica for a while (sync_server > running on the original master and sync_client on the original replica), force > a sync to all users and shared folders and then switch the IPs back. > > (To be more exact, each 'role change' (switching of master/replica roles and > reverting to original) consists of > 1) force syncronisation > 3) manually run any remaining synclogs How do I do that / what's the difference between forced sync and a manual sync log run? > 4) shut down current replica 5) > change ip 6) start master services in what used to be replica 7) make sure > everything appears to be ok 8) start sync_server in what used to be master) > > > HTH > -- Mit freundlichen Grüßen, / Best Regards, Sven SCHWEDAS Systemadministrator TAO Beratungs- und Management GmbH | Lendplatz 45 | A - 8020 Graz Mail/XMPP: sven.schwedas@xxxxxx | +43 (0)680 301 7167 http://software.tao.at
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