[LON-CAPA-admin] ntp

[H. K. Ng]

Martin,

I used your configuration file, changing the time servers. It does not 
solve the problem. I am puzzled why the same configuration works on (only) 
one of the servers and not the rest. What does ntpd depends on? How should 
the step-tickers file look like?

hk

At 10:08 AM 3/25/03 -0800, you wrote:
>The problem is in all likelyhood that your machine synchronizes to itself
>(localhost). You must explicitly tell it not to do that. Here is the
>/etc/ntp.conf file that I am using on dalton.chem.sfu.ca:
>
>===</etc/ntp.conf example>=============================================
>driftfile /etc/ntp/ntp.drift
>server  ntp.sfu.ca      # 142.58.103.1  whistler.sfu.ca
>server  seymour.sfu.ca  # 142.58.103.2
>server  morgoth.sfu.ca  # 142.58.101.12
>server  rm-rstar.sfu.ca # 142.58.120.21
>#
># Setup default restrictions
>#
>restrict default ignore
>#
># Servers
>#
>restrict 142.58.103.1 noquery       # whistler
>restrict 142.58.103.2 noquery       # seymour
>restrict 142.58.110.12 noquery            # morgoth
>restrict 142.58.120.21 noquery            # rm-rstar
>#
># Answer our own requests but don't synchronise
>#
>restrict 127.0.0.1 notrust
>========================================================================
>
>The critical line is the last line. You should always check with
>"ntpq -p" whether ntp is working correctly. On dalton this gives:
>
># $ ntpq -p
>      remote           refid      st t when poll 
> reach   delay   offset  jitter
>==============================================================================
>*whistler.sfu.ca time.nist.gov    2 u  530 1024  377    0.708    3.443   3.139
>+seymour.sfu.ca  whistler.sfu.ca  3 u  444 1024  377    0.602   -9.743   0.482
>  morgoth.sfu.ca  0.0.0.0         16 u    - 1024    0    0.000    0.000 
> 4000.00
>+rm-rstar.sfu.ca usno.pa-x.dec.c  2 u  490 1024  377    0.702  -12.283  10.777
>
>The "morgoth.sfu.ca" line is typical for a ntp server that is not working.
>If you have only such lines (or just a localhost line), you'll see the
>effects that you are describing.
>
>Martin
>
>On Tue, Mar 25, 2003 at 08:03:09AM -0500, Gerd Kortemeyer wrote:
> > We wish we knew. We have been struggling with the RedHat setup of NTP
> > for quite a while.
> >
> > On Tuesday, March 25, 2003, at 07:55  AM, H. K. Ng wrote:
> >
> > >Hi,
> > >
> > >One of my lon-capa servers time is off even though the ntpd is
> > >running. When I restart it again, it says that it in sync with our
> > >official clock but is almost 5 minutes off - i.e., it does not reset
> > >to the correct time. The ntp.conf and step.tickers are identical for
> > >the two machines. Any suggestions why?
> > >
> > >Regards,
> > >hk
> > >
> > >
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