topic Re: NTP issue in Operating System - HP-UX

NTP issue

gogleboy — Thu, 06 Nov 2008 13:22:59 GMT

HI,

I have installed NTP server and there is seconds diffetent in client so could you tell me the reasion and how to resolve

Thanks
Nanda

Re: NTP issue

Steven E. Protter — Thu, 06 Nov 2008 14:41:37 GMT

Shalom Nanda,

It may be the system time is more than an hour different from the time server in ntp.conf, which would prevent ntp from adjusting the system clock under certain OS levels.

It may be bad time servers.

The firewall could be blocking port 123 access from the firewall to this machine. Commonly ntp is closed.

SEP

Re: NTP issue

rick jones — Fri, 07 Nov 2008 01:36:34 GMT

In addition to making sure you can run ntp traffic through your firewalls, you should check syslog. On a client if the time is too far off from the servers, ntp will not adjust the clock. It throws up its hands and says "help" as it were :)

IIRC HP-UX at initial startup will query an NTP server via the ntpdate command. That will do an initial setting of the clock, and after that the xntpd should be much happier. You can make sure that happens by editing /etc/rc.config.d/netdaemons to make sure that NTPDATE_SERVER is set.

Also, on the NTP server, run ntpq and a "peers" command:

$ ntpq
ntpq> peers

Your server will not serve time to any clients until it has synchronized to a higher stratum (lower number) server.

Also, you should strive to point your NTP server at at least three sources of time so its "false ticker" heuristics can weed-out bad time.

Re: NTP issue

Javed Khan_1 — Fri, 07 Nov 2008 06:07:46 GMT

Hi,

Please post below command output

$ntpq -c rv
$ntpq -p
$ps -ef | grep xntpd

In case if you want to sync time manually with time server stop xntpd and run

$ntpdate ntpservername

Regards,
Javed Khan

Re: NTP issue

gogleboy — Fri, 07 Nov 2008 09:26:17 GMT

Thanks all,