man ntpdate:

"
     -s      Divert logging output from the standard output (default) to the
             system syslog(3) facility.  This is designed primarily for
conve-
             nience of cron(8) scripts.
"
Change your cron job to

5 * * * * /usr/sbin/ntpdate -s ru.pool.ntp.org

This will suppress the email you're getting. Consequently, this doesn't
solve the problem of not finding a suitable time server, but for that I'd
suggest enabling ntpd. You should do some reading ('man ntpd') or more
specifically, if you don't want to leave ntpd running, read-up on 'ntpd -q'
which mimmicks the behavior of ntpdate but allows you to use multiple ntp
servers.

-- 
Nathan Vidican
nat...@vidican.com

On Fri, Mar 12, 2010 at 5:57 AM, Антон Клесс <antoniok....@gmail.com> wrote:

> I have the following line in my root cron:
>
> 5 * * * * /usr/sbin/ntpdate ru.pool.ntp.org > /dev/null
>
> That must hourly adjust system time via NTP.
> But I discover that it works from time to time: some days just once, some
> days 5-6 times a day I receive e-mail with text like
>
> 12 Mar 12:05:05 ntpdate[25368]: no server suitable for synchronization
> found
>
>
> But if I log in to server and run
>
> # /usr/sbin/ntpdate ru.pool.ntp.org
>
> everything always works OK: it says
>
> 12 Mar 13:51:57 ntpdate[27256]: adjust time server 80.93.56.210 offset
> -0.616000 sec
>
>
> Maybe NTP server doesn't like when some client (my server) asks it such way
> - once a hour in same minute - and blocks my queries?
>
> Any suggestions?
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