Hi Tobias, thanks for the detailed research on that.
You are actually right and I got it working using sysvinit on Debian Squeeze. I just had to add the following line to /etc/inittab: ca:12345:ctrlaltdel:/sbin/shutdown -t1 -a -h now The lxc-debian template script creates a minimal /etc/inittab without the "ca" line. Christoph On 05/16/2011 10:47 PM, Tobias Gruetzmacher wrote: > Hi, > > On Mon, May 16, 2011 at 10:01:31AM +0200, Christoph Mitasch wrote: >> the idea is actually good, but my experience is that modern Linux >> distros are unable to shutdown with "kill -s INT/PWR". > > Well. I consider the default setup of your "modern" Linux distros > broken. So pressing Ctrl+Alt+Del on those does nothing? At all? > >> I tested on Debian Squeeze and Ubuntu Natty and it didn't work. What >> distro are you using? > > Debian on Debian. Works out of the box. And just for the fun of it: > > For reference: On a "normal" system, the Linux kernel sends SIGINT to > PID 1 when a "keyboard interrupt" (Ctrl+Alt+Del) is received. Search for > ctrl_alt_del and kill_cad_pid in the kernel for details. > > What actually happens after PID 1 receives the signal is a policy > decision. Let's see how different processes running as PID 1 handle > this (I'm using Debian packages as reference, see those for versions): > > * sysvinit (2.88dsf-13.6) > > As seen in src/init.c, lines 2429-2441, this just runs the ctrlaltdel > entry from /etc/inittab, which can be configured to shut down the > container. > > * upstart (0.6.6-2): > > If I see this correctly, in init/main.c, line 453, there is a signal > handle for SIGINT. There even is a default job file to handle this event > at conf/control-alt-delete.conf. > > * systemd (25-2): > > The code to handle this is in src/manager.c, lines 2120-2132. This > triggers ctrl-alt-del.target, which seems to be an alias for either > halt, reboot or poweroff, maybe based on a symlink? > > * runit (2.1.1-6.2): > > Handler is in src/runit.c lines 38-41 and seems to trigger a state > transition in lines 220-241. Looks sane. > > > > So it SEEMS that any "modern" init system should handle SIGINT just > fine. If they don't, now would be a good time to find out why... > > Have a nice day, Tobias ------------------------------------------------------------------------------ What Every C/C++ and Fortran developer Should Know! Read this article and learn how Intel has extended the reach of its next-generation tools to help Windows* and Linux* C/C++ and Fortran developers boost performance applications - including clusters. http://p.sf.net/sfu/intel-dev2devmay _______________________________________________ Lxc-devel mailing list Lxc-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/lxc-devel
