[SOLVED] NTP time difference

zaeem · 04-22-2011, 06:14 AM

Dear All,

I am facing any issue with synchronizing server (CentOS 5.5 64bit) time with NTP server.I am executing command ntpdate 192.168.31.2 192.168.223.2 through crontab each minute. I have few other servers with same configuration on centos distribution. Neither Time match with servers themselves nor with the NTP server. Can anybody give me clue how to fix that?

Any help would be greatly appreciated.

michaelk · 04-22-2011, 06:24 AM

What are the time differences?
Running ntp is a better method since it will compensate for clock drift whereas ntpdate does not.

EricTRA · 04-22-2011, 06:24 AM

Hello,

I don't see why you have ntpdate executing every minute. If you have NTP configured correctly and have connection to a NTP pool (or dedicated time server in your network) then it get's synchronized by the NTP daemon itself. Execute this command and post output:

Code:

ntpq -p

as root.

Kind regards,

Eric

michaelk · 04-22-2011, 06:33 AM

In addition, ntpdate will fail to update if ntp is currently running.

EricTRA · 04-22-2011, 06:42 AM

Quote:

Originally Posted by michaelk

In addition, ntpdate will fail to update if ntp is currently running.

Hi,

Correctly, thanks for pointing that out. Forgot to mention it.

Kind regards,

Eric

zaeem · 04-22-2011, 09:01 AM

Dear EricTRA

# ntpq -p
ntpq: read: Connection refused

zaeem · 04-22-2011, 09:05 AM

Dear michaelk,

Can you please let me know if any tutorial is available on the web which explains /etc/ntp.conf file.

Thanks for your help.

michaelk · 04-22-2011, 09:36 AM

Quote:

Originally Posted by zaeem

Dear EricTRA

# ntpq -p
ntpq: read: Connection refused

Indicates ntp is not running.

Hopefully these links will help.
http://publib.boulder.ibm.com/infoce...s/ntp.conf.htm
https://wiki.archlinux.org/index.php...rotocol_daemon

EricTRA · 04-22-2011, 09:38 AM

Quote:

Originally Posted by zaeem

Dear EricTRA

# ntpq -p
ntpq: read: Connection refused

Hi,

As pointed out by michaelk, this indicates that NTP is not running. Check if you have it installed (rpm -q ntp) and if not install it using yum (yum install ntp).

Kind regards,

Eric

zaeem · 04-24-2011, 04:37 AM

Dear Guys,

Thanks for your kind support. I've setup NTP on my server. I really appreciate your help.

EricTRA · 04-24-2011, 04:42 AM

Hello,

You're welcome. Glad you've got it solved. Have fun with Linux.

Kind regards,

Eric