Simpler Navigation for Servers and Operating Systems
Completed: a much simpler Servers and Operating Systems section of the Community. We combined many of the older boards, so you won't have to click through so many levels to get at the information you need. Check the consolidated boards here as many sub-forums are now single boards.
cancel
Showing results for 
Search instead for 
Did you mean: 

how to retard ntp sync

SOLVED
Go to solution
Alpha977
Valued Contributor

how to retard ntp sync

Hello all!

I need to know how i can to retard the ntp syncronize with the ntp server.

How i can do this?

Thank you!

(points to reply)
7 REPLIES
Ivan Ferreira
Honored Contributor

Re: how to retard ntp sync

You can use the minpoll option. See man ntp for detailed information.
Por que hacerlo dificil si es posible hacerlo facil? - Why do it the hard way, when you can do it the easy way?
Steven E. Protter
Exalted Contributor

Re: how to retard ntp sync

Shalom,

service ntpd stop
or
service xntpd stop

Depending on your distribution.

You can also modify ntp.conf and restart.

SEP
Steven E Protter
Owner of ISN Corporation
http://isnamerica.com
http://hpuxconsulting.com
Sponsor: http://hpux.ws
Twitter: http://twitter.com/hpuxlinux
Founder http://newdatacloud.com
rick jones
Honored Contributor

Re: how to retard ntp sync

At the risk of showing I didn't fully understand the question...

I was under the impression that as NTP achieved sync with the time server(s) it naturally backed-off on the polling interval to something like 1024 seconds, and that if it didn't back-off it suggested that NTP was having trouble establishing and/or keeping synchronization.

In that case, setting minpoll might treat a symptom of sending many queries, but not a root cause...
there is no rest for the wicked yet the virtuous have no pillows
Alpha977
Valued Contributor

Re: how to retard ntp sync

Thanks to all for the reply.

Now i need to know how configure the minpool, because i don't find it on the man page.

Thanks!
Charles Holland
Trusted Contributor
Solution

Re: how to retard ntp sync

The minpoll is an option in your /etc/ntp.conf file. Review your ntp.conf and you will be able to figure it out. To make it active you will need to stop/start your ntp process.

Regards
"Not everything that can be counted counts, and not everything that counts can be counted" A. Einstein
Charles Holland
Trusted Contributor

Re: how to retard ntp sync

Well I first thought you were talking about HPUX but then realized you were talking about Linux. Anyway it is basically the same thing. Here is an example out of my /usr/share/doc/packages/xntp/conf directory were I simply did a grep for poll I found both minpoll and maxpoll entries.

minpoll:
server 127.127.22.1 minpoll 4 # PPS quick poll

maxpoll:
manycastclient 239.1.1.1 autokey maxpoll 12 ttl 7

Now if minpoll is indicating that it will attempt ever 4 seconds to sync, and maxpoll it that it will go to 12 seconds before trying to sync how does it manage to get to a 1024 polling (slightly over 17 minutes) interval as represented by
# ntpq -p
remote refid st t when poll reach delay offset jitter
==============================================================================
LOCAL(0) LOCAL(0) 10 l 35 64 377 0.000 0.000 0.004
*server1 tick.usno.navy. 2 u 687 1024 377 0.256 -2.726 0.068
+server2 bonehed.lcs.mit 2 u 691 1024 377 0.393 -2.202 0.568

Perhaps because I don't have either min nor max in my /etc/ntp.conf file. There is probably a maximum you can specify. I might suggest that you explore http://www.eecis.udel.edu/~ntp for further answers.

Regards
"Not everything that can be counted counts, and not everything that counts can be counted" A. Einstein
Alpha977
Valued Contributor

Re: how to retard ntp sync

Thank Charles for your reply!

I'm looking for this!

Thanks again!

Regards