[Date Prev][Date Next]   [Thread Prev][Thread Next]   [Thread Index] [Date Index] [Author Index]

Re: ntp issue.



Jumping into the middle of this, have you tried stopping ntp and then setting the time. Let it run for a while to see if the hardware has an issue with keeping time.

On Fri, 3 Aug 2007, Herta Van den Eynde wrote:

On 02/08/07, Andrew Bridgeman corusgroup com
<Andrew Bridgeman corusgroup com> wrote:



Thanks for the info. I have done the things you mentioned but it still
seems to be losing time. For example I have been doing the testing on one
machine, I have made the changes you said, stopped started the ntpd service
and within a couple of hours it was 1.6 sec behind the Windows servers it
is time slaving from. My guess would be that if i leave it for a week it
will be a least couple of hours behind.
I have checked the drift file contents and it is just set to 0.000 and also
the key file does not have anything in it apart from the default values. It
seems to have a problem after the service have been restarted ( maybe issue
polling and retrieving the information ) because when this is done it
communicates with the server and the time it spot on.

Can anyone suggest something else to try!

Regards

[IMAGE]
|+----------------------------+-------------------------------------------|
||   "Herta Van den Eynde"    |                                           |
||   <herta vandeneynde gmail |   To: "General Red Hat     |
||   com>                     |   Linux discussion list"                  |
||   Sent by:                 |   <redhat-list redhat com>                |
||   redhat-list-bounces redha|   cc:                             |
||   t.com                    |   Subject: Re: ntp issue.  |
||                            |                                           |
||   31/07/2007 11:37         |                                           |
||   Please respond to General|                                           |
||   Red Hat Linux discussion |                                           |
||   list                     |                                           |
||                            |                                           |
|+----------------------------+-------------------------------------------|






On 31/07/07, Andrew Bridgeman corusgroup com
<Andrew Bridgeman corusgroup com> wrote:


The ntp information is below. The Full IP address is show below just as
"IP" for security reasons.

restrict default ignore
restrict IP mask 255.255.255.255 nomodify notrap noquery
restrict 127.0.0.1
server IP
fudge 127.127.1.0 stratum 10
driftfile /var/lib/ntp/drift
broadcastdelay 0.008
authenticate yes
keys /etc/ntp/keys

Let me know what you think?

Regards

Andrew Bridgeman


|+----------------------------+-------------------------------------------|
|| "Herta Van den Eynde" |
|
|| <herta vandeneynde gmail | To: "General Red Hat |
|| com> | Linux discussion
list" |
|| Sent by: |
<redhat-list redhat com> |
|| redhat-list-bounces redha| cc: |
|| t.com | Subject: Re: ntp issue. |
|| |
|
|| 31/07/2007 11:06 |
|
|| Please respond to General|
|
|| Red Hat Linux discussion |
|
|| list |
|
|| |
|

|+----------------------------+-------------------------------------------|






On 31/07/07, Andrew Bridgeman corusgroup com
<Andrew Bridgeman corusgroup com> wrote:




Hello All,
I have a strange issue at the moment with regards ntp
working incorrectly on 35 of our Redhat WS Version 3 Linux machines. I
have
set them all up the same way so they use the IP of our Windows Cluster
machine I did this by adding the IP to the ntpservers file and the
tick-servers file. In addition edited the ntp.conf file to show the
cluster
IP as well.

What I seem to get is time differences on the machines within a day of
stopping and starting the ntpd service. For example I did this
yesterday
and below shows all the machine times now ( 24 hours ) later, you will
notice there are 30 sec to a minute differences already and I bet with
in
a week or a month they get even more out of sync. Has any body got any
ideas on what i can check or change to get this working correctly as
currently it is causing real issues when we run analysis jobs over
night.

Time on Machines
==============
Tue Jul 31 10:38:46 BST 2007
Tue Jul 31 10:38:48 BST 2007
Tue Jul 31 10:38:47 BST 2007
Tue Jul 31 10:38:48 BST 2007
Tue Jul 31 10:38:48 BST 2007
Tue Jul 31 10:39:00 BST 2007
Tue Jul 31 10:39:04 BST 2007
Tue Jul 31 10:39:04 BST 2007
Tue Jul 31 10:39:04 BST 2007
Tue Jul 31 10:39:05 BST 2007
Tue Jul 31 10:39:06 BST 2007
Tue Jul 31 10:39:06 BST 2007
Tue Jul 31 10:38:58 BST 2007
Tue Jul 31 10:38:59 BST 2007
Tue Jul 31 10:38:59 BST 2007
Tue Jul 31 10:39:00 BST 2007
Tue Jul 31 10:39:00 BST 2007
Tue Jul 31 10:39:01 BST 2007
Tue Jul 31 10:39:01 BST 2007
Tue Jul 31 10:39:02 BST 2007
Tue Jul 31 10:39:02 BST 2007
Tue Jul 31 10:39:02 BST 2007
Tue Jul 31 10:39:02 BST 2007
Tue Jul 31 10:39:05 BST 2007
Tue Jul 31 10:39:04 BST 2007
Tue Jul 31 10:39:04 BST 2007
Tue Jul 31 10:39:04 BST 2007
Tue Jul 31 10:39:05 BST 2007
Tue Jul 31 10:39:05 BST 2007
Tue Jul 31 10:39:05 BST 2007
Tue Jul 31 10:39:07 BST 2007
Tue Jul 31 10:39:07 BST 2007
Tue Jul 31 10:39:07 BST 2007
Tue Jul 31 10:39:08 BST 2007
Tue Jul 31 10:39:12 BST 2007

Regards

Andrew Bridgeman

What does your ntp config look like? (grep -v ^\# /etc/ntp.conf)

Anything in the ntp log?

Kind regards,

Herta


Try putting your restrict clauses towards the bottom of the file.
Also verify that the drift file exists, and that it's owner and group
are set to ntp. Also check syslog for ntp errors.
FWIIW, I usually find it easier to write ntp logs to an alternate log
file, which you can do by adding a clause such as this one:

logfile /var/log/ntp # alternate log file

Kind regards,

Herta

Hi Andrew,

You write that after restarting ntpd, "within a couple of hours it was
1.6 sec behind" and a bit further: "It seems to have a problem after
the service have been restarted ( maybe issue polling and retrieving
the information ) because when this is done it
communicates with the server and the time it spot on."
I'm confused.  It sounds like at a certain point ntpd works properly.
Or what do you mean by "when this is done"?

Also, could you let us know whether there's anything in either syslog
or in an ntp log file?

Kind regards,

Herta

--
redhat-list mailing list
unsubscribe mailto:redhat-list-request redhat com?subject=unsubscribe
https://www.redhat.com/mailman/listinfo/redhat-list




[Date Prev][Date Next]   [Thread Prev][Thread Next]   [Thread Index] [Date Index] [Author Index]