On 05/25/2012 11:24 AM, Christian Seiler wrote: > Hi, > >> Have you looked at the lxc-shutdown script we have in Ubuntu and the >> integration we have with upstart? > > No, not yet, but I'll look at it later. > >> lxc-shutdown sends two different signals: >> reboot => SIGINT >> shutdown => SIGPWR >> >> These are caught by upstart and will trigger a clean reboot or >> shutdown >> of the container. It's what happens on shutdown of the host in 12.04 >> LTS. > > On a Debian container I had lying around here it had no effect > whatsoever, because there's nothing in the /etc/inittab catching it. > > Is it document behaviour that upstart shuts down on SIGPWR? (upstart > has no /etc/inittab where this may be configured, right?) Because if it > is that easy to cause upstart deterministically to shut down, then that > is definitely something we should use.
Upstart sends an event when it gets SIGPWR, in 12.04, I introduced a new job in upstart that triggers on it and triggers the shutdown: stgraber@castiana:~$ cat /etc/init/shutdown.conf # Trigger an immediate shutdown when upstart receives SIGPWR # this is useful for some UPS monitoring tools and for clean # shutdown of containers description "Trigger an immediate shutdown on SIGPWR" start on power-status-changed task exec shutdown -h now "SIGPWR received" > > Still, I think my initial rationale still holds that lxc-stop should > shut down by default, because I certainly didn't expect lxc-stop to kill > everything with SIGKILL when I tried it for the first time. So basically > all I'm saying is that Ubuntu's lxc-shutdown logic should be implemented > in lxc-stop and that it should be a bit more generic with the > possibility that the user can configure different methods in the config > file. I remember Serge and I discussed that at some point and ended up making it a separate tool. I can't remember the exact rational for this so I'll let Serge answer :) > > Regards, > Christian -- Stéphane Graber Ubuntu developer http://www.ubuntu.com
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