Hanns Mattes via dovecot <dovecot@dovecot.org> wrote
> Sorry,
>
> this was aimed to the german list.
I would have answered in English anyway ;-)
> But feel free to answer - any hint appreciated :-)
>
> Am 26.01.25 um 16:37 schrieb Hanns Mattes via dovecot:
>> Hei,
>> mit 2.4 verschwindet ja, wenn ich das richtig verstanden habe, die
>> Replication aus dem Werkzeugkasten von Dovecot. Obwohl ich nur ein recht
>> kleines System mit etwa 500 Nutzern betreibe fand ich die Replication
>> als ziemlich beruhigend :-)
>> Meine Frage in die Runde: Wie wollt Ihr die Replikation ersetzen?
How to replace replication?
Yeah, that's what I am currently investigating, and I do have a crude proof of
concept which needs more thorough testing, though.
BTW: I do have only 5 users ;-)
Concept:
1) every user needs a sieve script starting with:
require ["vnd.dovecot.execute"]; # add all your other requiries ...
# replication with doveadm sync …
execute "_REPLICATE" "test-replication";
2) dovecot.conf:
# home-brewn replication
sieve_extensions = +vnd.dovecot.execute
sieve_plugins = sieve_extprograms
sieve_execute_bin_dir = /any/path/to/your/script
sieve_extension_exec_timeout = 1s
3) script /any/path/to/your/script/_REPLICATION (sorry its csh)
#!/bin/csh
set LOGGER = "/usr/bin/logger -p mail.info -t replication"
if ( $#argv != 1 ) then
echo "missing user in $0" | ${LOGGER}
exit 1
endif
set USER = $argv[1]
set DOVEADM = "/usr/local/bin/doveadm"
set DELAY = "1" # this will give sieve time to
finalise before synchronising
set LOCK = "1"
set TIMEOUT = "30"
set PORT = "12345" # see doveadm service in
dovecot.conf
set DESTINATION = "my.destination.server"
# immediately spawn this script to let sieve continue ist work and
store that mail accordingly
# otherwise synchronisation will come before storage
( sleep ${DELAY} ; ${DOVEADM} sync -P -l ${LOCK} -T ${TIMEOUT} -u
${USER} tcp:${DESTINATION}:${PORT} ) |& ${LOGGER} &
exit 0
This will replicate all incoming mails, even those incoming simultaneously at
both servers.
(But I haven't tested it with huge numbers of mails, yet)
4) This doesn't trigger modified IMAP flags, deletions, and such. Thus I will
add a crontab script similar to that above, that will synchronise both servers
every minute or such.
Remarks:
#) This is FreeBSD. I am running postfix and dovecot in the same service jail
#) Both servers are connected via an ipsec tunnel. Thus I do not need to use
ssh. But that should be easy to add.
#) I could live with 4) only, but I do now my users ;-)
#) my script needs to become much more bullet proof w.r.t. to locking, checking
for runaway processes, and such.
#) v2.3
https://doc.dovecot.org/2.3/configuration_manual/sieve/plugins/extprograms/
#) v2.4 https://doc.dovecot.org/2.4.0/core/plugins/sieve_extprograms.html
I am testing this on both of my servers with active replication with dovecot
2.3.21.1.
Thus needed to disable replication for test user "test-replication", though.
Again, this is just an initial concept that needs further testing and
investigation [1]
HTH and regards,
Michael
[1] how could one tell an listening daemon about modifications of IMAP flags
... ?
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