[Dovecot] how-to use dsync to do a 2 ways replication ?

[Eric Belhomme]

Hi,

I want to set-up two dovecot imap servers, with active-active replicated
maildirs. The goal is to have a hosted public server on Internet, and a
private server on my LAN to speed-up local connections.

So I compiled dovecot 2.0 beta 1 in order to use dsync utility...
Actually my config is pretty simple as I just want to setup a proof of
concept before going ahead in this way :

(Both servers are Debian Lenny with excatly the same config)

mail0:~# /usr/local/dovecot2/sbin/dovecot -n
# 2.0.beta1: /etc/dovecot2/dovecot/dovecot.conf
# OS: Linux 2.6.26-2-686 i686 Debian 5.0.3 
auth_debug = yes
auth_verbose = yes
login_trusted_networks = 172.16.64.0/18
mail_location = maildir:%h
passdb {
  args = /etc/dovecot/userpasswd
  deny = no
  driver = passwd-file
}
postmaster_address = postmaster at example.com
service pop3-login {
  inet_listener {
    port = 110
  }
  inet_listener {
    port = 995
    ssl = yes
  }
}
service imap-login {
  inet_listener {
    port = 143
  }
  inet_listener {
    port = 993
    ssl = yes
  }
}
ssl_cert = </etc/ssl/certs/dovecot.pem
ssl_key = </etc/ssl/private/dovecot.pem
userdb {
  driver = prefetch
}
userdb {
  args = /etc/dovecot/userpasswd
  driver = passwd-file
}

I logged on the first server with an IMAP client then I copied many
email through IMAP, then I launched dsync as root :

 /usr/local/dovecot2/bin/dsync -v mirror 'ssh
eole.it.fr.eve /usr/local/dovecot2/bin/dsync'
root at eole.it.fr.eve's password: 
dsync-local(root): Error: Can't create mailbox ssh: Mailbox already
exists
dsync-local(root): Error: Can't create mailbox aptitude: Mailbox already
exists
dsync-local(root): Error: Can't create mailbox debtags: Mailbox already
exists
dsync-local(root): Info: debtags: only in source
dsync-local(root): Info: aptitude: only in source
dsync-local(root): Info: ssh: only in source
dsync-local(root): Info: ssh: only in dest
dsync-local(root): Info: aptitude: only in dest
dsync-local(root): Info: debtags: only in dest
dsync-local(root): Error: Mailbox ssh changed its GUID
(cdfc9a2d85154e4b47180000b31a5865 -> 541e9f2850234e4b3a2b0000d0cf7273)
dsync-local(root): Error: msg iteration failed: Couldn't open mailbox
dsync-remote(root): Error: Can't create mailbox debtags: Mailbox already
exists
dsync-remote(root): Error: Can't create mailbox aptitude: Mailbox
already exists
dsync-remote(root): Error: Can't create mailbox ssh: Mailbox already
exists
dsync-remote(root): Error: Mailbox debtags changed its GUID
(501e9f2850234e4b3a2b0000d0cf7273 -> d1fc9a2d85154e4b47180000b31a5865)
dsync-remote(root): Error: msg iteration failed: Couldn't open mailbox
dsync-remote(root): Error: command MSG-LIST failed
dsync-local(root): Error: Mailbox ssh changed its GUID
(cdfc9a2d85154e4b47180000b31a5865 -> 541e9f2850234e4b3a2b0000d0cf7273)
dsync-local(root): Error: Mailbox aptitude changed its GUID
(cffc9a2d85154e4b47180000b31a5865 -> 521e9f2850234e4b3a2b0000d0cf7273)
dsync-local(root): Error: Mailbox debtags changed its GUID
(d1fc9a2d85154e4b47180000b31a5865 -> 501e9f2850234e4b3a2b0000d0cf7273)
dsync-local(root): Error: Mailbox ssh changed its GUID
(cdfc9a2d85154e4b47180000b31a5865 -> 541e9f2850234e4b3a2b0000d0cf7273)
dsync-local(root): Error: Mailbox aptitude changed its GUID
(cffc9a2d85154e4b47180000b31a5865 -> 521e9f2850234e4b3a2b0000d0cf7273)
dsync-local(root): Error: Mailbox debtags changed its GUID
(d1fc9a2d85154e4b47180000b31a5865 -> 501e9f2850234e4b3a2b0000d0cf7273)
mail0:~# dsync-remote(root): Error: Mailbox debtags changed its GUID
(501e9f2850234e4b3a2b0000d0cf7273 -> d1fc9a2d85154e4b47180000b31a5865)
dsync-remote(root): Error: Mailbox aptitude changed its GUID
(521e9f2850234e4b3a2b0000d0cf7273 -> cffc9a2d85154e4b47180000b31a5865)
dsync-remote(root): Error: Mailbox ssh changed its GUID
(541e9f2850234e4b3a2b0000d0cf7273 -> cdfc9a2d85154e4b47180000b31a5865)
dsync-remote(root): Error: Mailbox debtags changed its GUID
(501e9f2850234e4b3a2b0000d0cf7273 -> d1fc9a2d85154e4b47180000b31a5865)
dsync-remote(root): Error: Mailbox aptitude changed its GUID
(521e9f2850234e4b3a2b0000d0cf7273 -> cffc9a2d85154e4b47180000b31a5865)
dsync-remote(root): Error: Mailbox ssh changed its GUID
(541e9f2850234e4b3a2b0000d0cf7273 -> cdfc9a2d85154e4b47180000b31a5865)


It seems dsync tries to use my system user database instead of
the /etc/dovecot/userpasswd file !

I found dsync doc on the wiki at http://wiki2.dovecot.org/Tools/dsync
but this is not really clear for me...

So maybe someone can tell me what's wrong ?

Regards,

-- 
Eric Belhomme