[AG-TECH] NTP Questions

[Bob Olson]

if you create a file /etc/ntp/step-tickers that contains the hostname of
the ntp server, it will time-synch to that server when the service starts
up.

--bob

On Fri, 12 Jul 2002, George Estes wrote:

>    As I remember the time on your machine must be close, I don't remember 
> how close, before the server will snyc.  I know it will not sync if you 
> machine clock is off by 10 minutes.  On my machine, RedHat 7.1, I then run 
> /usr/sbin/ntpdc -p my-machine-name  and the delay should be less than .01.
> 
> George
> At 04:19 PM 7/12/2002 +0100, you wrote:
> >I've got a couple of questions related to NTP. Bear with me, this is not a
> >short email...
> >
> >I've built my audio and video capture machines manually (i.e. not AGiB).
> >That means that I installed all the bits separately. That also means that my
> >NTP wasn't nicely configured and "just working".
> >
> >Don Morton helpfully told me what should go in my file /etc/ntp.conf:
> >
> >server ntp-1.accessgrid.org
> >driftfile /etc/ntp/drift
> >
> >I restarted ntpd afterwards.
> >
> >My time stayed as it was (about 10 minutes wrong!). Do I have to wait to get
> >into synch? Maybe, but my settings don't look right anyway. (Read on...)
> >
> >I've been scooting around some of the docs about ntp and tried running
> >ntpq - with 'pe', 'as' and 'rv'. I got this:
> >
> >---------Start output
> >[root at audio root]# ntpq
> >ntpq> pe
> >      remote           refid      st t when poll reach   delay   offset
> >jitter
> >============================================================================
> >==
> >  ag.mcs.anl.gov  0.0.0.0         16 u    -   64    0    0.000    0.000
> >4000.00
> >ntpq> as
> >ind assID status  conf reach auth condition  last_event cnt
> >===========================================================
> >   1 48124  8000   yes   yes  none    reject
> >ntpq> rv 48124
> >status=8000 unreach, conf, no events,
> >srcadr=ag.mcs.anl.gov, srcport=123, dstadr=192.150.184.66, dstport=123,
> >leap=11, stratum=16, precision=-17, rootdelay=0.000,
> >rootdispersion=0.000, refid=0.0.0.0, reach=000, unreach=13, hmode=3,
> >pmode=0, hpoll=6, ppoll=10, flash=00 ok, keyid=0, offset=0.000,
> >delay=0.000, dispersion=0.000, jitter=4000.000,
> >reftime=00000000.00000000  Thu, Feb  7 2036  6:28:16.000,
> >org=00000000.00000000  Thu, Feb  7 2036  6:28:16.000,
> >rec=00000000.00000000  Thu, Feb  7 2036  6:28:16.000,
> >xmt=c0d96d24.d4832335  Fri, Jul 12 2002 15:58:44.830,
> >filtdelay=     0.00    0.00    0.00    0.00    0.00    0.00    0.00    0.00,
> >filtoffset=    0.00    0.00    0.00    0.00    0.00    0.00    0.00    0.00,
> >filtdisp=   16000.0 16000.0 16000.0 16000.0 16000.0 16000.0 16000.0 16000.0
> >ntpq> quit
> >[root at audio root]#
> >---------End output
> >
> >Do I have a problem?
> >
> >Second question. (Is anyone still with me, I wonder...) On my other machine,
> >I tried installing xntp. Possibly not a smart idea, but anyway.
> >
> >Here, I got a different (possibly worse because I've got 'reach=no' rather
> >than 'auth=no'?) output:
> >
> >---------Start output
> >root at video etc]# /usr/sbin/ntpq
> >ntpq> pe
> >      remote           refid      st t when poll reach   delay   offset
> >disp
> >============================================================================
> >==
> >  ag.mcs.anl.gov  0.0.0.0         16 u    -   64    0     0.00    0.000
> >16000.0
> >ntpq> as
> >ind assID status  conf reach auth condition  last_event cnt
> >===========================================================
> >   1 37636  8000   yes    no
> >ntpq> quit
> >---------End output
> >
> >Help would be gratefully received...
> >
> >Thanks,
> >Mike
> >
> >-----------------------oOo-----------------------
> >Michael Daw
> >Computer Services for Academic Research (CSAR)
> >
> >Manchester Computing, Kilburn Building,
> >University of Manchester, Manchester M13 9PL, UK
> >
> >Tel: +44 (0)161 275 7026
> >Fax: +44 (0)161 275 6800
> >Email: michael.daw at man.ac.uk
> >
> >http://www.csar.cfs.ac.uk/staff/daw/
> >-----------------------OoO-----------------------
>