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Re: Time time synchronization problem
Posted: 2014/05/06 18:21:38
by udy786
avij wrote:Try this on both:
Code: Select all
yum install ntp
service ntpd start
chkconfig ntpd on
Wait around 10 minutes, then run
date to see if your clock is synchronized [yes, there are multiple ways to do this, but this is the easiest].
If you are already running ntpd, please provide the output of
ntpq -pn
I have started ntpd but still getting same problem. Also I have rebooted my server still same.
Some one please help me.
Re: Time synchronization problem
Posted: 2014/05/06 18:28:19
by gerald_clark
Are either of these virtual machines?
Re: Time synchronization problem
Posted: 2014/05/06 23:27:29
by avij
The above question about VMs is also a very good question.
In addition to that, let ntpd run for about 5-10 minutes, run ntpq -pn and post the output.
Re: Time synchronization problem
Posted: 2014/05/07 14:36:28
by udy786
gerald_clark wrote:Are either of these virtual machines?
No. I have installed on dedicated server. No other OS is installed on both server.
Re: Time synchronization problem
Posted: 2014/05/07 16:46:41
by udy786
avij wrote:The above question about VMs is also a very good question.
In addition to that, let ntpd run for about 5-10 minutes, run ntpq -pn and post the output.
Here is output of both server.
CentOS 6.2
Code: Select all
[root@DataBase ~]# ntpq -pn
remote refid st t when poll reach delay offset jitter
==============================================================================
*120.88.47.10 10.84.87.146 2 u 551 1024 377 21.806 4.263 15.942
+123.108.225.6 200.98.196.212 2 u 477 1024 377 26.303 21.912 15.833
Code: Select all
[root@Asterisk ~]# ntpq -pn
remote refid st t when poll reach delay offset jitter
==============================================================================
-125.62.193.121 129.6.15.29 2 u 899 1024 377 69.206 12.181 11.464
+120.88.47.10 10.84.87.146 2 u 950 1024 377 19.682 -5.153 13.109
*120.88.46.10 103.1.106.69 2 u 968 1024 377 27.375 -8.565 11.841
+202.71.136.67 203.185.69.60 2 u 960 1024 377 13.372 -9.959 15.117
127.127.1.0 .LOCL. 10 l 62 64 377 0.000 0.000 0.001
Re: Time synchronization problem
Posted: 2014/05/07 17:07:38
by avij
According to that output, both servers are within 10 milliseconds of the 'correct' time. This is shown in the offset column, where the numbers signify the difference to the upstream clock in milliseconds. The clock source selected for time synchronization is marked with a * in the first column. The jitter is a bit high, but ntpd does not seem to have too much problems with it. You may get better results if you hand-pick upstream NTP servers that are closer to you, but your use case doesn't seem to require sub-millisecond accuracy, so I'd keep things as is for now.
I would comment out the "Undisciplined Local Clock" (127.127.1.0) clock source from the CentOS 5.x server's configuration (/etc/ntp.conf) for aesthetic reasons. Apart from that, your configuration seems fine. If the clock starts drifting again, run ntpq -pn again (before resetting the clock) to see what ntpd is doing when it can't sync the clock.
Re: Time synchronization problem
Posted: 2014/05/07 17:38:46
by udy786
