time/ntp[d]

michael cs at networkingnewsletter.org.uk
Wed Aug 6 15:42:09 UTC 2008


On Wed, 2008-08-06 at 09:20 -0400, Todd Denniston wrote:
> michael wrote, On 08/06/2008 03:56 AM:
> > It seems my clock is losing time but yet I have 'enable Network Time
> > Protocol' enabled and set to a local time machine. If I
> 
> by "a local time machine" do you mean:
> server 127.127.1.0
> ???
> 
> or
> server 130.88.200.6 burst
> restrict 130.88.200.6 mask 255.255.255.255 nomodify notrap noquery
> ???


I didn't mean 127.127.1.0  (no idea what that means...) and yes I did
mean 130.88.200.6 although I've no idea what those server/restrict cmds
are about

> 127.127.1.0 is only *sort of* reliable once it has been disciplined, i.e., a 
> drift file built up for a few days.
> 
> > 
> > 	sudo /etc/init.d/ntpd stop
> > 	sudo /usr/sbin/ntpdate 130.88.200.6
> > 
> > then it resets it to the correct time, so how come it's losing time? 
> > 
> 
> start ntpd, wait ~15 minutes, then run
> /usr/sbin/ntpq -p
> and send us the results.
> i.e., to little information so far.

okay, restarted ntpd from cmd line, waiting 15 mins and here's ntpq =p
gives:
mkb at veri:/var/log$ sudo /usr/sbin/ntpq -p
Password:
     remote           refid      st t when poll reach   delay   offset
jitter
==============================================================================
 utserv.mcc.ac.u 193.62.22.98     2 u   14   64  377    0.303  369608.
3831.40

but it's still out:

mkb at veri:/var/log$ date
Wed Aug  6 16:41:41 BST 2008

mkb at veri:/var/log$ ssh michael at ratty date
Wed Aug  6 16:47:57 BST 2008



and ntpd reports in /var/log/messages:

Aug  6 16:14:35 veri ntpd[13480]: ntpd 4.2.4p2 at 1.1495-o Tue Aug 21
13:58:55 UTC 2007 (1)
Aug  6 16:14:35 veri ntpd[13481]: precision = 1.000 usec
Aug  6 16:14:35 veri ntpd[13481]: Listening on interface #0 wildcard,
0.0.0.0#123 Disabled
Aug  6 16:14:35 veri ntpd[13481]: Listening on interface #1
wildcard, ::#123 Disabled
Aug  6 16:14:35 veri ntpd[13481]: Listening on interface #2 vmnet8,
fe80::250:56ff:fec0:8#123 Enabled
Aug  6 16:14:35 veri ntpd[13481]: Listening on interface #3 lo, ::1#123
Enabled
Aug  6 16:14:35 veri ntpd[13481]: Listening on interface #4 eth0,
2002:8258:438d:8:219:d1ff:fee5:62f#123 Enabled
Aug  6 16:14:35 veri ntpd[13481]: Listening on interface #5 eth0,
fe80::219:d1ff:fee5:62f#123 Enabled
Aug  6 16:14:35 veri ntpd[13481]: Listening on interface #6 vmnet1,
fe80::250:56ff:fec0:1#123 Enabled
Aug  6 16:14:35 veri ntpd[13481]: Listening on interface #7 lo,
127.0.0.1#123 Enabled
Aug  6 16:14:35 veri ntpd[13481]: Listening on interface #8 eth0,
130.88.15.180#123 Enabled
Aug  6 16:14:35 veri ntpd[13481]: Listening on interface #9 vmnet1,
192.168.115.1#123 Enabled
Aug  6 16:14:35 veri ntpd[13481]: Listening on interface #10 vmnet8,
172.16.232.1#123 Enabled
Aug  6 16:14:35 veri ntpd[13481]: kernel time sync status 0040
Aug  6 16:14:35 veri ntpd[13481]: frequency initialized 197.849 PPM
from /var/lib/ntp/drift



> > I was expecting to see stats in /var/log/ntpstats (as per my Debian box)
> > but that dir doesn't exist on this Fed box...
> > 
> 
> You have to config ntpd (in /etc/ntp.conf) to keep the stats, which are most 
> times not needed, and I don't remember what config items have to be set to 
> keep those stats.

arg, was looking at /etc/sysconfig/ntpd




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