On 01/02/13 11:18, Adam Tauno Williams wrote: > On Fri, 2013-02-01 at 10:01 +0000, John wrote: >> Hello, I have just set up a second server for a small email group and I >> now have replication working between them. > Great. > >> I was very happy to note that it replicates both ways. > It does??? What version is this? I have one box running 2.4.13 and another, the master, at 2.4.17. I need to update the other but haven't got around to it yet. I'm just doing some testing. v2.4.13 4255a887 2011-12-30 v2.4.17 d1df8aff 2012-12-01 I was surprised when things appeared to replicate both ways. > >> My use-case is basically this: to have two servers, one acting as a >> primary and another as a backup. The primary will be the one that goes >> out to the internet to grab emails for users. Apart from that difference >> the two servers are identical. Either can take on the primary role. >> Users can connect their IMAP email clients to either server. One of the >> pair runs sync_server and the other regularly connects to it to keep the >> two servers in sync. It's a basic configuration intended for use by a >> small number of people. > As far as I know that will not work. I've only been doing this for a day. I've got two mail clients sitting side by side - one is connected to the master and the other to the replica. I can definitely type mails on either client and see them appear on the other (after a small delay). I find that I have to kick the replication at the moment (with a "sync_client -u myuser") for the updates to come back to the master. The updates to the replica seem pretty much instantaneous. I do have messages in the logs which I don't yet understand and this might be because it doesn't actually work - I don't know yet: Feb 1 11:55:38 localhost sync_client[239]: MAILBOX received NO response: IMAP_MAILBOX_CRC Checksum Failure Feb 1 11:55:38 localhost sync_client[239]: CRC failure on sync for user.john, trying full update Feb 1 11:55:38 localhost sync_client[239]: SYNCNOTICE: highestmodseq higher on replica user.john, updating 36158 => 36160 Feb 1 11:55:38 localhost sync_client[239]: SYNCNOTICE: only on replica user.john 57616 Feb 1 11:55:38 localhost sync_client[239]: SYNCNOTICE: only on replica user.john 57617 Feb 1 11:55:38 localhost sync_client[239]: MAILBOX received NO response: IMAP_MAILBOX_CRC Checksum Failure Feb 1 11:55:38 localhost sync_client[239]: CRC failure on sync for user.john.Queue, trying full update Feb 1 11:55:38 localhost sync_client[239]: SYNCNOTICE: highestmodseq higher on replica user.john.Queue, updating 13 => 16 Feb 1 11:55:38 localhost sync_client[239]: SYNCNOTICE: only on replica user.john.Queue 3 Feb 1 11:55:38 localhost sync_client[239]: SYNCNOTICE: only on replica user.john.Queue 4 Feb 1 11:55:38 localhost sync_client[239]: MAILBOX received NO response: IMAP_MAILBOX_CRC Checksum Failure Feb 1 11:55:38 localhost sync_client[239]: CRC failure on sync for user.john.hosts.root^blurb, trying full update Feb 1 11:55:38 localhost sync_client[239]: SYNCNOTICE: highestmodseq higher on replica user.john.hosts.root^blurb, updating 6035 => 6036 Feb 1 11:55:38 localhost sync_client[239]: SYNCNOTICE: record mismatch with replica: user.john.hosts.root^blurb more recent on replica Feb 1 11:55:38 localhost sync_client[239]: SYNCNOTICE: master uid:3620 modseq:6034 last_updated:1359719530 internaldate:1359716512 flags:( NonJunk) Feb 1 11:55:38 localhost sync_client[239]: SYNCNOTICE: replica uid:3620 modseq:6035 last_updated:1359719721 internaldate:1359716512 flags:( NonJunk) Feb 1 11:55:38 localhost sync_client[239]: SYNCNOTICE: record mismatch with replica: user.john.hosts.root^blurb more recent on replica Feb 1 11:55:38 localhost sync_client[239]: SYNCNOTICE: master uid:3620 modseq:6034 last_updated:1359719530 internaldate:1359716512 flags:( NonJunk) Feb 1 11:55:38 localhost sync_client[239]: SYNCNOTICE: replica uid:3620 modseq:6035 last_updated:1359719721 internaldate:1359716512 flags:( NonJunk) Feb 1 11:55:38 localhost sync_client[239]: seen_db: user john opened /srv/mail/cyrus/user/j/john.seen Any thoughts? >> I'd like to confirm that the replication mechanism implemented with >> sync_server and sync_client is ok for this kind of set-up. It certainly >> appears to work just fine like this but I haven't found anything in the >> documentation saying that two-way replication like this is ok (i.e. >> where users can log in to either server). > I believe that multi-master is a feature for 2.5.x. ---- Cyrus Home Page: http://www.cyrusimap.org/ List Archives/Info: http://lists.andrew.cmu.edu/pipermail/info-cyrus/ To Unsubscribe: https://lists.andrew.cmu.edu/mailman/listinfo/info-cyrus ---- Cyrus Home Page: http://www.cyrusimap.org/ List Archives/Info: http://lists.andrew.cmu.edu/pipermail/info-cyrus/ To Unsubscribe: https://lists.andrew.cmu.edu/mailman/listinfo/info-cyrus
