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Old 01-21-2009, 06:55 PM   #1
noir911
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Registered: Apr 2004
Posts: 682

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NTP high offset


I have two Redhat servers - RHEL ES 4 and RHEL AS 4 - running
ntp-4.2.0. I have modified the /etc/ntp.conf and /etc/ntp/ntpservers
to point them to my ntp server. But my network monitoring system is
saying that these two Redhat servers are having a high offset: Offset
57521.46715 secs and Offset -181.4311465 secs respectively.
No other server in my network is having this issue. If I restart ntpd
on these servers, the problem goes away for a few minutes but comes
back again.

/etc/ntp.conf file -

restrict default nomodify notrap noquery
restrict 127.0.0.1
server ntp1.mycompany.com
server 127.127.1.0 # local clock
fudge 127.127.1.0 stratum 10
driftfile /var/lib/ntp/drift
broadcastdelay 0.008
keys /etc/ntp/keys

/etc/ntp/ntpservers file -

ntp1.mycompany.com

Thanks for any help resolving this issue.
 
Old 01-22-2009, 09:34 AM   #2
TB0ne
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Registered: Jul 2003
Location: Birmingham, Alabama
Distribution: SuSE, RedHat, Slack,CentOS
Posts: 22,071

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Quote:
Originally Posted by noir911 View Post
I have two Redhat servers - RHEL ES 4 and RHEL AS 4 - running
ntp-4.2.0. I have modified the /etc/ntp.conf and /etc/ntp/ntpservers
to point them to my ntp server. But my network monitoring system is
saying that these two Redhat servers are having a high offset: Offset
57521.46715 secs and Offset -181.4311465 secs respectively.
No other server in my network is having this issue. If I restart ntpd
on these servers, the problem goes away for a few minutes but comes
back again.

/etc/ntp.conf file -

restrict default nomodify notrap noquery
restrict 127.0.0.1
server ntp1.mycompany.com
server 127.127.1.0 # local clock
fudge 127.127.1.0 stratum 10
driftfile /var/lib/ntp/drift
broadcastdelay 0.008
keys /etc/ntp/keys

/etc/ntp/ntpservers file -

ntp1.mycompany.com

Thanks for any help resolving this issue.
Are these VMware servers, by any chance?? If so, there is a kernel patch you'll have to get from RedHat, to fix this. There's a known issue with time drift on RHEL servers on VMware....
 
  


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