[Dovecot] Time moved backwards
Scott Silva
ssilva at sgvwater.com
Tue May 13 22:33:58 EEST 2008
on 5-13-2008 12:13 PM Adam McDougall spake the following:
> Charles Marcus wrote:
>> On 5/13/2008, Eugene (genie at geniechka.ru) wrote:
>>
>>>> I guess terminating all current connections and restarting all
>>>> processes
>>>> would be pretty safe, but it's not really a high priority change for
>>>> me..
>>>>
>>
>>
>>> Nevertheless, it would be very nice if you could fix it. It's a
>>> fairly big availability problem (for us, at least).
>>>
>>
>> The problem is not so much how dovecot deals with this issue, the
>> problem is, why is your server having such drastic problems keeping its
>> time sane?
>>
>> Fix that, and your problem disappears.
>>
>>
> I would just like to mention a circumstance that happened to me this
> Sunday. We had a total power outage in our building, longer than our
> UPS's could last and we don't have a generator for servers (nor is it
> economical or needed). When the power came back on, my local NTP server
> came on at the same time as my mail servers, as well a majority of my
> other servers. My servers tried to step their time to be in sync with
> my local NTP server, which was still busy trying to sync itself with
> outside sources, which takes a while, so my mail servers did not get an
> answer. Later, dovecot died because the time finally synced, and I
> found out why pretty quick (have seen this before) but this was an
> unusual situation.
> My point is, we had an unusual circumstance, and even though I've taken
> steps to have my mail servers sync their time at boot and run ntpd
> afterwards, there are some circumstances in which this is not enough,
> and dovecot still died. Its not always because someone was lazy about
> their time setup. But it doesn't cause me "big availability problems"
> since in general, my time is fine.
>
This would be a good case for running ntpdate on startup at least on the ntp
server. Just point it to a reliable outside server. AFAIR RedHat and clones do
this in the init script for ntpd.
--
MailScanner is like deodorant...
You hope everybody uses it, and
you notice quickly if they don't!!!!
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