ntp issue.

Fri Aug 3 00:34:12 UTC 2007

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 at corusgroup.com
> <Andrew.Bridgeman at 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 at gmail.|   To: "General Red Hat     |
>> ||   com>                     |   Linux discussion list"                  |
>> ||   Sent by:                 |   <redhat-list at redhat.com>                |
>> ||   redhat-list-bounces at redha|   cc:                             |
>> ||   t.com                    |   Subject: Re: ntp issue.  |
>> ||                            |                                           |
>> ||   31/07/2007 11:37         |                                           |
>> ||   Please respond to General|                                           |
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>> ||                            |                                           |
>> |+----------------------------+-------------------------------------------|
>>
>>
>>
>>
>>
>>
>> On 31/07/07, Andrew.Bridgeman at corusgroup.com
>> <Andrew.Bridgeman at 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 at gmail.| To: "General Red Hat |
>>> || com> | Linux discussion
>> list" |
>>> || Sent by: |
>> <redhat-list at redhat.com> |
>>> || redhat-list-bounces at 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 at corusgroup.com
>>> <Andrew.Bridgeman at 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
>
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