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08-25-2012 06:10 AM
08-25-2012 06:10 AM
ntp client configuration
Hi,
I want to configure ntp client in my server. The OS is HP-UX 11.11. Can you just give me the procesure how can i do that? Also in my server there are oracle database running that are time dependent. Should I stop the database before config? Also should i have to reboot the server after ntp configuration?
Plz help me. i have to do the config ASAP.
Regards,
Arafat
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08-25-2012 08:04 AM - edited 08-25-2012 08:13 AM
08-25-2012 08:04 AM - edited 08-25-2012 08:13 AM
Re: ntp client configuration
There are a couple of steps to setup NTP, but first you must verify that your server is capable of reaching an reference NTP server. If your network administrator has setup a local NTP server, use that server, typically by IP address as often the DNS server is not setup with a stable hostname for the NTP server's address. Firewalls and/or routers are often setup to act as an NTP server.
If you don't have a local NTP server, use the NTP pool for your server. The pool collects multiple NTP servers to provide an accurate source of time information. To find a server for your location, go to
http://www.pool.ntp.org/en/use.html
For the US, a server to test will be north-america.pool.ntp.org so test connectivity with:
ntpq -p north-america.pool.ntp.org
You should see something like this:
# ntpq -p north-america.pool.ntp.org remote refid st t when poll reach delay offset disp ============================================================================== 69.22.157.2 ntp.your.org 2 u 336d 1024 0 21.69 -4.619 15937.5 -time.anycast.re ntp.cox.net 2 u 243 1024 377 21.59 4.525 14.85 -swisstime.ee.et swisstime2.ee.e 2 u 776 1024 377 105.51 -0.113 18.69 *ntp0.rrze.uni-e .GPS. 1 u 533 1024 377 90.40 0.028 18.68 +ntps1-0.eecsit. .PPS. 1 u 161 1024 377 101.77 -0.079 14.85 -ntp0.nl.uu.net .PPS. 1 u 781 1024 377 93.79 -1.448 14.84 -ntp1.nl.uu.net .PPS. 1 u 244 1024 377 95.35 -1.672 18.66 +ntp.alaska.edu .GPS. 1 u 271 1024 377 112.01 0.252 14.84
The actual server names and values will be different as the pool changes the servers regularly to spread the load. If you get a timeout or response error message, port 123 is not open on your network and you'll need to followup with your network administrator to allow NTP service.
Replace the file /etc/ntp.conf (which is full of comments) with:
server north-america.pool.ntp.org fudge 127.127.1.1 stratum 10 # localhost if NTP servers fail driftfile /etc/ntp.drift
Now since you indicated that you are running Oracle, all databases and applications that use timestamps for records must be put into read-only mode or shutdown to prevent errors when the time jumps.
Edir the file /etc/rc.config.d/netdaemons and modify these lines:
export NTPDATE_SERVER=north-america.pool.ntp.org export XNTPD=1 export XNTPD_ARGS="-l /var/adm/xntpd.log"
As mentioned earlier, replace the NTP pool server with the one(s) associated with your location.
And that's it for configuration. Once your time-sensitive applications and databases have been stopped, you can manually set the time to be close to current time. But most important, make sure that your current login has the correct timezone:
echo $TZ
If not, change the TZ value to your local timezone before setting the time of day. Use the date command to set the time. This is required to make sure that the time difference is small so that NTP can make a small adjustment to bring the time to match the NTP server(s). Now start the NTP server:
/sbin/init.d/xntpd start
You will see a message that shows the adjustment and from now (including a reboot), the time will be synchronized, typically less than one second.
Bill Hassell, sysadmin
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08-25-2012 07:49 PM
08-25-2012 07:49 PM
Re: ntp client configuration
Hi Bill,
Thanks for your suggestion. The timezone is ok. and the current time of the server is ok now. Should I reboot the server after the service start ?
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08-25-2012 11:54 PM
08-25-2012 11:54 PM
Re: NTP client configuration
>Should I reboot the server after the service start?
No, there is no need to do that. Especially if the time is fine.
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08-26-2012 09:05 AM
08-26-2012 09:05 AM
Re: ntp client configuration
When you start the xntpd service, it will immediately jump the time to the correct setting. From then on, NTP will automatically keep the time of day clock in sync.
Bill Hassell, sysadmin