Migration question

[Olivier Boucard]

Hi Ludvik,

Thank you  so much for all this information. It is clearer for me now.

Olivier

On 2017-03-15 00:20, Ludvík Schmarcz wrote:
> Hi 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
>
> Ludvík Schmarcz
> IT specialista
>
> tel.: 777 726 780
>
>
>
>
>
>
>
>
> --
> --------------------------------------
> ---- Black Sun IT Services s.r.o. ----
> --------------------------------------
> -- computers - graphics - solutions --
> --- networks - internet - intranet ---
> --------------------------------------
> ------- http://www.blacksun.cz <http://www.blacksun.cz/> -------
> --------------------------------------
>
>> 14. 3. 2017 v 22:38, Olivier Boucard <olivier at pafostech.com
>> <mailto:olivier at pafostech.com>>:
>>
>> Hi 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
>>
>> On 2017-03-14 19:21, Ludvík Schmarcz wrote:
>>> Hi 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
>>>
>>> Ludvík 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/> -------
>>> --------------------------------------
>>>
>>>> 14. 3. 2017 v 16:37, Olivier Boucard <olivier at pafostech.com
>>>> <mailto:olivier at pafostech.com>>:
>>>>
>>>> Hi,
>>>>
>>>> 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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>>>> https://lists.kolab.org/mailman/listinfo/users
>>>
>>
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