2016-07-18 15:02 GMT+02:00 Lennart Poettering <lenn...@poettering.net>: > On Mon, 18.07.16 14:41, Michael Biebl (mbi...@gmail.com) wrote: > >> 2016-07-18 14:00 GMT+02:00 Michael Biebl <mbi...@gmail.com>: >> > 2016-07-18 13:54 GMT+02:00 Lennart Poettering <lenn...@poettering.net>: >> >> On Mon, 18.07.16 13:37, Michael Biebl (mbi...@gmail.com) wrote: >> >> >> >>> Apparently SIGPWR is used by lxc-stop to shut down LXC containers. >> >>> What interface would you recommend instead? >> >>> >> >>> https://lists.linuxcontainers.org/pipermail/lxc-users/2015-May/009279.html >> >> >> >> Is that actually really used? I mean, upstart is pretty much dead >> >> afaics... >> >> >> >> systemd since day one shuts down cleanly on SIGRTMIN+4, and it's >> >> probably what a container manager should use (it is what machined >> >> uses). See the "Signals" section in systemd(1). >> > >> > lxc containers require sigpwr.target to be hooked up properly, >> > otherwise lxc-stop does not shutdown the container. >> >> SIGPWR is wired up in sysvinit and upstart by default to initiate a >> shutdown. Afaics both do not react on SIGRTMIN+4. > > Well, many sysvinit distros where set up to log something about > "IMPENDING POWER FAILURE" on SIGPWR... It sounds really wrong to > trigger this in a container just to shut it down...
I do not really disagreeing here. I'm just trying to understand the current situation. >> So the problem here is that lxc doesn't know what runs inside the >> container: could be an older version of Debian (using syvinit), and >> older version of Ubuntu (using upstart) or systemd. > Well, if they don't want to make SIGRTMIN+4 the default because they > think sysvinit/Upstart is more relevant than systemd, then that's > their right. But I think making the kill signal configurable per > container would probably be a good idea. That's what we do in nspawn, > where SIGRTMIN+3 is the default, but you can override it with > --kill-signal= on the cmdline (or KillSignal= in .nspawn files), for > compat with sysv. I was told that this is already configurable in lxc via lxc.haltsignal. So afaics, lxc-create would just need to make sure to set this accordingly on distros which use systemd by default. Michael -- Why is it that all of the instruments seeking intelligent life in the universe are pointed away from Earth? _______________________________________________ systemd-devel mailing list systemd-devel@lists.freedesktop.org https://lists.freedesktop.org/mailman/listinfo/systemd-devel