Rich Wales wrote: > Earlier, I wrote: > >>> What do I need to do in order for changes made on the replica >>> to get copied over to the master? > > Bron Gondwana replied: > >> Impossible. You don't do this. What you can do (the simple >> case of what we do) is set up two Cyrus instances on each >> machine, replicating to each other, and set up user accounts >> on one or the other, so you can get full use of both machines. > > I note that sync_client can take a list of mailboxes on the command > line. Does this define (and limit) the set of mailboxes that are > replicated? If a mailbox is listed in the command line, are sub- > mailboxes replicated too? No > > My environment (family network) only has half a dozen users, and the > set of users changes only rarely. Suppose I do the following: > > (1) I divide my users into two groups -- each group assigned to one > of my two Cyrus servers as the master for those users. > > (2) The sync_client line in cyrus.conf for each server lists the > mailboxes for the users assigned to that server as master. Each > user is listed in the sync_client command line of only one server. > > (3) Each server is configured (via the sync_... lines in imapd.conf) > to sync to the other server. > > (4) Both servers would be running sync_server. > > So, I would have replication set up going both directions between my > two servers, but the sets of users handled in each direction would be > disjoint. Each user would be assigned to one IMAP server (the master > for their mailbox collection), and the other server would be their > replica and act as their backup. > > Would this work? > > Remember, again, that I'm talking about a small installation. Clearly, > a scheme requiring every user's mailbox to be explicitly listed in one > or the other server's sync_client line is not going to scale to a large > setup with hundreds or thousands of users; I understand this. A first problem is that normally sync_client is started with -r (rolling mode) in the start section of cyrus.conf. Running sync_client -u wouldn't work because sync_client isn't started as a daemon. You could try to put the sync_client -u lines in the event section of cyrus.conf. If you then set the period rather small, you nearly have synchronous replication. > If this idea of doing two-way partial replication with a single Cyrus > instance on each server will in fact work, should I use the same value > for sync_machineid on both servers? Or should they be different? I wouldn't know. -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- Rudy Gevaert Rudy.Gevaert@xxxxxxxx tel:+32 9 264 4734 Directie ICT, afd. Infrastructuur ICT Department, Infrastructure office Groep Systemen Systems group Universiteit Gent Ghent University Krijgslaan 281, gebouw S9, 9000 Gent, Belgie www.UGent.be -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- ---- Cyrus Home Page: http://cyrusimap.web.cmu.edu/ Cyrus Wiki/FAQ: http://cyrusimap.web.cmu.edu/twiki List Archives/Info: http://asg.web.cmu.edu/cyrus/mailing-list.html
