Problem with replication ("Fatal: -N parameter requires syncing with remote host")

[Vanja]

As it usually happens, I found out the answer after reading my own mail
to mailing list multiple times. I knew it had to be simple.

Somehow, I managed to screw up config and mail_plugin section had the
entry "192.168.1.100" instead of "tcp:192.168.1.100". Replication
appears to be working now (at least few test mails that I got through
triggered it).

I am aware that I need to prepend tcp: and I am 100% sure I did it
initially, but at some point I removed it and never noticed it (and
never paid attention to it). Whoops.

So... If anyone runs into this problem, fix it easy :)

On 03/16/2015 03:12 PM, Vanja wrote:
> I have been fighting, for 2 days, with a Dovecot setup and I now
> officially need help :)
> 
> Basically, I am trying to setup replication between 2 identical Dovecot
> servers, on different physical servers (different hostnames/etc, of
> course), and although I've managed to solve many problems I can't
> overcome the final hurdle.
> 
> When a mail comes in to one of the servers, replication over TCP should
> kick in and mail should be replicated, but instead I get this in the
> mail log:
> 
> -------------------------------------------------------------------------------------------------
> dovecot2 dovecot: doveadm(user1 at test1.int): Fatal: -N parameter requires
> syncing with remote host
> -------------------------------------------------------------------------------------------------
> 
> Mail is delivered to dovecot2 server, Postfix delivers it via LMTP, and
> everything seems to work ok. However, I can't figure out the cause for
> the error that I am seeing. I have looked into source code and found
> where this error is triggered (line 834 in
> doveadm/dsync/doveadm-dsync.c, inside Dovecot 2.2.9 source code), but I
> am afraid that I don't understand the context (ctx->run_type ==
> DSYNC_RUN_TYPE_LOCAL) and it would take me a lot of time to debug the
> whole thing from the scratch. I've never looked into Dovecot internals
> before, so it's all a mystery to me at this point.
> 
> I've tried stracing the process but the flow does not make sense to me,
> I can't understand what exactly happens before error is displayed. Also,
> there is no traffic to port 12345 on other node, so execution fails
> before syncing even starts (and error message is not related with remote
> node config/setup/etc).
> 
> Triggering replication manually, from command line, works as expected:
> 
> # doveadm sync -A tcp:192.168.1.100
> 
> (at this point user1's mail folder is properly updated on remote server)
> 
> I've tried searching around, but it appears that noone else has this
> problem(or isn't complaining about it :).
> 
> I am not sure if I am doing something wrong (apart from replication). I
> will need to support multiple virtual domains and I am basically using
> passwd-file for authentication, so I am using a single passwd file for
> all virtual domain users which allows user lookup (doveadm user '*') to
> work, which is required by replication.
> 
> This is configuration file from dovecot2 server (which I use for testing
> and delivering mails):
> 
> --- config start ---
> 
> # 2.2.9: /etc/dovecot/dovecot.conf
> # OS: Linux 3.16.0-30-generic x86_64 Ubuntu 14.04.2 LTS ext4
> debug_log_path = /var/log/dovecot_debug.log
> doveadm_password = 67890
> doveadm_port = 12345
> mail_debug = yes
> mail_location = maildir:/vmail/mail/%d/%n/Maildir
> mail_plugins = " notify replication"
> namespace inbox {
>   inbox = yes
>   location =
>   mailbox Drafts {
>     special_use = \Drafts
>   }
>   mailbox Junk {
>     special_use = \Junk
>   }
>   mailbox Sent {
>     special_use = \Sent
>   }
>   mailbox "Sent Messages" {
>     special_use = \Sent
>   }
>   mailbox Trash {
>     special_use = \Trash
>   }
>   prefix =
> }
> passdb {
>   args = username_format=%u /vmail/auth/passwd
>   driver = passwd-file
> }
> plugin {
>   mail_replica = 192.168.1.100
> }
> protocols = imap lmtp
> service aggregator {
>   fifo_listener replication-notify-fifo {
>     user = vmail
>   }
>   unix_listener replication-notify {
>     user = vmail
>   }
> }
> service auth-worker {
>   unix_listener auth-worker {
>     user = dovecot-auth
>   }
> }
> service auth {
>   unix_listener /var/spool/postfix/private/auth {
>     group = postfix
>     mode = 0660
>     user = postfix
>   }
>   user = dovecot-auth
> }
> service doveadm {
>   inet_listener {
>     port = 12345
>   }
> }
> service imap-login {
>   inet_listener imap {
>     port = 0
>   }
> }
> service lmtp {
>   inet_listener lmtp {
>     address = 127.0.0.1
>     port = 10024
>   }
>   process_min_avail = 3
>   unix_listener /var/spool/postfix/private/dovecot-lmtp {
>     group = postfix
>     mode = 0660
>     user = postfix
>   }
>   user = vmail
> }
> service replicator {
>   process_min_avail = 1
>   unix_listener replicator-doveadm {
>     mode = 0666
>   }
> }
> ssl_cert = </etc/dovecot/dovecot.pem
> ssl_key = </etc/dovecot/private/dovecot.pem
> userdb {
>   args = username_format=%u /vmail/auth/passwd
>   default_fields = uid=vmail gid=vmail home=/vmail/mail/%d/%n
>   driver = passwd-file
> }
> protocol lmtp {
>   postmaster_address = root at localhost
> }
> 
> 
> --- config end ---
> 
> Configuration file on other node is exactly the same, except different
> IP address in mail_replica statement.
> 
> Any help is much appreciated.
> 
> Thank you.
>