On Mon, 2010-01-25 at 21:50 +0100, Daniel Lezcano wrote: > > apologies for the length, but how is everyone else handling this? > > this is the last thing i need to solve before i actually start running > > all my services on this setup. > > > I was wondering if the kernel shouldn't send a signal to the init's > parent when sys_reboot is called.
Which still leaves open the question of telling the difference between a
halt and a reboot. My trick of using the final runlevel
in /var/run/utmp ran a foul over a gotcha in the Debian containers that
they seem to default to mounting tmpfs over /var/run and /var/lock so
you loose that information. I had to disable "RAMRUN" and "RAMLOCK"
in /etc/default/rcS in the debian images to get around that but I'm not
sure I'm happy doing that. The alternative examining /var/log/wtmp
didn't work out as reliable. OpenVZ has a similar problem and it writes
a "reboot" file that can be read but that seems inelegant as well. I
don't think anything works if someone does a "reboot -f" but I need to
test that condition yet.
To also answer the OP's question. Here's what I use. I have a script
that runs periodically in the host. If the number of processes in a
running container is 1, then I check for the runlevel in
${rootfs}/var/run/utmp. If that's "? 0" then it's a halt and I run
lxc-stop. If it's "? 6" then it's a reboot and I stop the container and
then restart it. I run it every 5 minutes or so or manually. It runs
fast and could be run more often. Just sucks polling things like that,
though. That script, lxc-check, is attached.
Mike
--
Michael H. Warfield (AI4NB) | (770) 985-6132 | m...@wittsend.com
/\/\|=mhw=|\/\/ | (678) 463-0932 | http://www.wittsend.com/mhw/
NIC whois: MHW9 | An optimist believes we live in the best of all
PGP Key: 0x674627FF | possible worlds. A pessimist is sure of it!
lxc-check
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