At 11:40 AM 4/14/2006, Jonathan Horne wrote:
i have read about 2 methods to sync the time on a freebsd box.
...i have a workstation and a server, which i originally did method
1 on, but soon enough, time drifted quite a bit. so i switched it
to the 2nd method, and they appear to be sync'd perfectly. a third
box i set up, i did only method 2, and this one did not stay synced
at all. after i manually ran 'ntpdate -v -b us.pool.ntp.org', this
box straightend up.
First off, ntpdate is obsolete, and will be retired "sometime in the
future". Its functionality has been incorporated into ntpd. I think
your problem is a limit in ntpd that's enabled by default. There is
a limit on how large a correction ntpd will make at one time, even at
boot up. ntpdate isn't that picky and always just syncs, even if the
offset is large.
Try some rtfmp on ntpd, ntpdate and ntpd.conf. I run ntpd on one
server, with a flag (-g) set to always sync, eg:
rc.conf:
ntpd_sync_on_start="YES" # Sync time on ntpd startup, even if
offset is high
ntpd_flags="-A -p /var/run/ntpd.pid"
And ntp.conf:
server rolex.usg.edu
driftfile /etc/ntp.drift
logfile /var/log/ntpd.log
restrict 208.62.177.32 mask 255.255.255.224 nomodify notrap
My other servers and desktops are similarly configured, but sync off
the first server.
Be sure to specify the driftfile; ntpd will "learn" how fast or slow
your clock is and record it, so it can apply corrections when/if an
internet connection isn't up. Be sure the file exists and has some
number. You can initialize with: echo "0" > /var//db/ntp.drift
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