Thank you so much for all this information. It is clearer for me now.
Post by LudvÃk SchmarczHi Olivier,
question is, if you have one public IP address for both servers
(behind NAT), or every one have own public IP address. In first case
do nothing, only correctly set up postfix on new server as on old one.
In second case you must add second server as next mail server (MX
record) with low priorinty number. Good practice also is to reduce the
expiration MX records to a small value (600s). In this moment you must
turn off postfix or block postfix ports by firewall on new
server, otherwise new server begin receiving mail before shutting down
the old server. After sync turn off old server, turn on postfix
(unblock) on new server and delete old MX record.
Ludvik
S pozdravem
LudvÃk Schmarcz
IT specialista
tel.: 777 726 780
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Post by Olivier BoucardHi Ludvik,
Thanks for the tips.
I vaguely remember having some mandatory DNS, and reverse-DNS, setup
to do before installing. Is it not anymore the case?
Olivier
Post by LudvÃk SchmarczHi Olivier,
In my experience, the best new installation, add users and use
imapsync. If the servers are virtualized, downtime is tens of
seconds (only change IP addresses behind the firewall after last
syncronisation).
Ludvik
S pozdravem
LudvÃk Schmarcz
IT specialista
tel.: 777 726 780
<PastedGraphic-1.tiff>
--
--------------------------------------
---- Black Sun IT Services s.r.o. ----
--------------------------------------
-- computers - graphics - solutions --
--- networks - internet - intranet ---
--------------------------------------
------- http://www.blacksun.cz <http://www.blacksun.cz/> -------
--------------------------------------
Post by Olivier BoucardHi,
I have an old Kolab 3.3 running on an old CentOS 6. I would like to
migrate to a new server running CentOS 7 with the latest Kolab.
What would be the steps (not in details just the overall process)
to do such a migration with no service interruption (keeping the
old server running)?
Especially concerning the DNS configuration.
Thanks
Olivier Boucard
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