Restarting ntpd on address change
From: Ian D. Leroux (ian_leroux_at_fastmail.fm)
Date: 11/30/05
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To: freebsd-stable@freebsd.org Date: Tue, 29 Nov 2005 21:01:16 -0500
Greetings,
My machine's ip address is assigned by DHCP, and whenever it changes
ntpd stops functioning and must be restarted. I gather this behavior
will be changed in some future ntpd version, but in the meantime I had
added a line to my /etc/dhclient-exit-hooks to restart ntpd every time a
new address was obtained:
# [...] setup variables for ipcheck
if [ -n "$new_ip_address" ]; then
# [...] run ipcheck to update my dyndns
/etc/rc.d/ntpd restart
fi
This seemed work fine on 5.4, but on 6.0 it gives problems at boot.
Specifically, I get repeated "bad file descriptor" errors after my
network address is assigned, and running ps after the boot completes
shows that there are two ntpd processes running. Killing one of them
stops the file descriptor errors. My interpretation of this (for what
it's worth) is that an ntpd process gets started before dhclient gets a
chance to configure the address (perhaps when the interface initially
comes up) and then when the address is assigned the /etc/rc.d/ntpd
restart starts a second process, but somehow fails to stop the first
one. For now I've removed that line from dhclient-exit-hooks, which
avoids the problems at boot time.
I have the feeling that I'm not doing the Right Thing here. So is there
an accepted (or at least known-good) way of automatically managing the
restart of ntpd on address change? Have I found a bug in rc.d worth
investigating? Or should I just stick to manual restarts until ntpd
stops needing them?
Thanks,
Ian D. Leroux
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