Date: Wed, 16 Sep 2009 14:49:28 +0100 From: Matthew Seaman <m.seaman@infracaninophile.co.uk> To: Steve Bertrand <steve@ibctech.ca> Cc: "questions@freebsd.org" <questions@freebsd.org> Subject: Re: New mail server setup Message-ID: <4AB0ECE8.2080905@infracaninophile.co.uk> In-Reply-To: <4AB0E97B.4060606@ibctech.ca> References: <4AB0584D.3050206@eagle.ca> <4AB0844B.5080804@infracaninophile.co.uk> <4AB0E97B.4060606@ibctech.ca>
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This is an OpenPGP/MIME signed message (RFC 2440 and 3156) --------------enigD2C71DFF635354C4A7387636 Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: quoted-printable Steve Bertrand wrote: > What I don't have, and have always wondered about, is live redundancy > for the IMAP/POP services. >=20 > I know that this would be a challenge to some degree considering the > high volume of data changes. >=20 > Perhaps a carp(4) setup between a couple of MDA's, where when the > primary is up, a constant rsync pushes the data to the backup. Or > perhaps a combination of rsync for manual changes, and a method to have= > the primary write the emails to a local disk, and a network disk > simultaneously? >=20 > If anyone has a setup that has redundancy for their IMAP/POP services, > and a method to keep the changing data relatively up-to-date, I'd love > to hear about it. Now, that is a different kettle of fish. This is a job for cyrus imap. I suggest googling for 'cyrus murder' -- this is almost, but not quite, a fully resilient mail store / IMAP system. Your mail store is divided into frontend IMAP protocol servers which handle user auth etc. and back-= end mail stores. The protocol layer servers are fully resilient and you can fail over a user session at will, but the mailstores don't quite get ther= e: mail is replicated across different stores, but actions modifying the mai= l store are not transactional across all the mail stores. Or in other words= , you can lose a small amount of data if one of the mail stores goes bang a= t precisely the wrong moment. Even so, it will do better at keeping multip= le copies of a mailstore in synch than any locally scripted rsync setup. Cheers, Matthew --=20 Dr Matthew J Seaman MA, D.Phil. Flat 3 7 Priory Courtyard PGP: http://www.infracaninophile.co.uk/pgpkey Ramsgate Kent, CT11 9PW, UK --------------enigD2C71DFF635354C4A7387636 Content-Type: application/pgp-signature; name="signature.asc" Content-Description: OpenPGP digital signature Content-Disposition: attachment; filename="signature.asc" -----BEGIN PGP SIGNATURE----- Version: GnuPG v2.0.13 (FreeBSD) Comment: Using GnuPG with Mozilla - http://enigmail.mozdev.org iEYEARECAAYFAkqw7O4ACgkQ3jDkPpsZ+Vaq3QCeO7tofnQr5/B/zqMndEG7VUaT t74An1oHMysFJioBQJP9BqIAIYQCUloT =sxed -----END PGP SIGNATURE----- --------------enigD2C71DFF635354C4A7387636--
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