http://wiki2.dovecot.org/Authentication/Caching

On Fri, Apr 8, 2011 at 10:33 PM, Patrick Domack <patrickdk@patrickdk.com>wrote:

For my small setups of less than a few thousand users, I make a small script that will dump the db tables to flatfiles.

This goes for postfix, and dovecot, with dovecot using the passwd file backend.

I did this for a few reasons at first, mainly cause I had to split my mysql and mail servers across datacenters and didn't want a connection issue to cause everything to halt. And after that, it just worked well. I didn't notice a lower load on mysql though, seems dovecot and postfix already cached good.

Quoting Voytek Eymont <voytek@sbt.net.au>:

Hi, new to dovecot

...

I'm setting a small postfix/dovecot server for virtual domain/users in mysql

dovecot is on one host, mysql on another

seems to be working, but I'm concerned over performance overhead of this setup;

dumb Q, is there any 'proxy mysql' or cacheing option I can use ?

any suggestions appreciated

also, my mail users as set as 5000/5000 virtual_gid_maps = static:5000 virtual_uid_maps = static:5000

so, I should use uid/gid 5000/5000 in query below, yes ?

thanks

-- Voytek

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# dovecot --version 1.2.9

Linux 2.6.32-21-generic-pae #32-Ubuntu SMP Fri Apr 16 09:39:35 UTC 2010 i686 GNU/Linux

# grep -v '^ *\(#.*\)\?$' dovecot-sql.conf driver = mysql connect = host=host.tld dbname=ddd user=ccc password=xxx

user_query = SELECT concat('/var/mail/vhosts/', maildir) as home, concat('maildir:/var/mail/vhosts/', maildir) as mail, 5000 AS uid, 5000 AS gid, concat('maildir:storage=', quota) AS quota FROM mailbox WHERE username = '%u' AND active = '1' default_pass_scheme = MD5 user_query = SELECT '/var/mail/vhosts/%d/%n@%d' as home, 'maildir:/var/mail/vhosts/%d/%n@%d' as mail, 5000 AS uid, 5000 AS gid, concat('dirsize:storage=', quota) AS quota FROM mailbox WHERE username = '%u' AND active = '1' password_query = SELECT username as user, password, '/var/mail/vhosts/%d/%n@%d' as userdb_home, 'maildir:/var/mail/vhosts/%d/%n@%d' as userdb_mail, 5000 as userdb_uid, 5000 as userdb_gid FROM mailbox WHERE username = '%u' AND active = '1'