topic help on ntp in Operating System - HP-UX

help on ntp

malay boy — Mon, 23 Apr 2007 03:09:38 GMT

Hi guy's,

This is the output from ntpq -p

remote=xxx.xxx.xxx.xxx
refid= xxxxx
st=2
t=u
when=233
poll=512
reach=377
delay=0.32
offset=0.02
disp=0.03

question :
1) How do i know how many minutes it's poll from ntp server ?.
2) is it possible that the "A server" time is ahead of the NTP server and the ntp will minus the time from "A server" to follow NTP server time ?.

Rgrds
mB

Re: help on ntp

Steven E. Protter — Mon, 23 Apr 2007 03:33:53 GMT

Shalom,

1) poll=512 Thats seconds.
2) ntp checks time sources from top to bottom in the configuration file.

SEP

Re: help on ntp

Wouter Jagers — Mon, 23 Apr 2007 03:34:00 GMT

Hi,

poll=512 --> This means the server will be polled every 512 secs.

when=233 --> This means the last contact with the server was 233 secs ago. If this number is less than the 'poll' value (which it is) that's good.

When the client's time is a little slow or ahead it will be corrected by the NTP server.

Only if the time is very far off you might see ntp complain.

Hope that helps,
Cheers,
Wout

Re: help on ntp

Jollyjet — Mon, 23 Apr 2007 03:55:23 GMT

The duration of update can be found from, the 'when' and 'poll' columns of
'ntpq -p' o/p.

When the 'when' count reaches the 'poll' value, the time will be
synchronized and the 'when' count will be re-set back.

Re: help on ntp

Bill Hassell — Mon, 23 Apr 2007 09:44:38 GMT

1) 512 seconds = 8 minutes and 30 seconds

2) The question is ambiguous - are you talking about a few seconds, a few minutes or a few hours? And are you using xntpd in the standard configuration, or are you running ntpdate to jump the time? Assuming you have setup xntpd correctly, the time will be slightly changed over a long period (hours if needed) to adjust the time to match the server.

Re: help on ntp

malay boy — Mon, 23 Apr 2007 22:27:16 GMT

Hi,
If the server need to adjust the time ( to follow the NTP server ) , is the activity will be log in the syslog.log file ?. OR where is NTP log file ?.

Sorry, I have left HPUX for couple of years already so my knowledge is rusty .

Regards
mB

Re: help on ntp

Patrick Wallek — Mon, 23 Apr 2007 22:34:02 GMT

Yes, NTP info is logged in /var/adm/syslog/syslog.log. You will see messages about "synchronization lost".

Re: help on ntp

Bill Hassell — Tue, 24 Apr 2007 20:15:35 GMT

> If the server need to adjust the time ( to follow the NTP server ) , is the activity will be log in the syslog.log file ?. OR where is NTP log file ?.

The man page for xntpd is very helpful. xntpd will log details to syslog.log. You can configure xntpd to log to a different file with -l . Change the command line startup options in /etc/rc.config.d/netdaemons file.

> Sorry, I have left HPUX for couple of years already so my knowledge is rusty .

NTP is not really HP-UX, it is an industry standard service so it's the same on virtually every platform (OK, Windows does it very badly with sntp) but this will also help:

www.ntp.org