Date: Sat, 11 Dec 2004 10:16:20 +0100 From: Michal Belczyk <diavul@bsd.krakow.pl> To: Julian Elischer <julian@elischer.org> Cc: freebsd-hackers@freebsd.org Subject: Re: rc.shutdown and jails Message-ID: <20041211091619.GA1620@grazer-2.bsd.krakow.pl> In-Reply-To: <41BAB35C.8030401@elischer.org> References: <20041210180332.GA27788@engelschall.com> <20041210234157.478BF840325@mail.npubs.com> <20041211082857.GA5218@engelschall.com> <41BAB35C.8030401@elischer.org>
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On Sat, Dec 11, 2004 at 12:44:12AM -0800, Julian Elischer wrote: > Ralf S. Engelschall wrote: > >On Fri, Dec 10, 2004, Nielsen wrote: > > > > > >>Ralf S. Engelschall wrote: > >> > >>>Currently a "/etc/rc.d/jail stop" just kills all processes in the > >>>individual jails. If /etc/default/rc.conf's default way of booting the > >>>jails (jail_exec="/bin/sh /etc/rc") is used this is a rather crual > >>>approach IMHO. I think if the jail is booted through /etc/rc it also > >>>should be given the chance to shutdown via /etc/rc.shutdown. If then > >>>there are still processes remaining, the killall(1) is fine, of course. > >>>This way packages and other sub-systems have the chance to perform a > >>>graceful shutdown. > >> > >>Definitely a good plan. You just have to watch out for environment > >>variable leakage into the jail subsystem when using jexec. A minor > >>concern, perhaps. > >>[...] > > > > > >Ok, good point. I think running "env -i /usr/sbin/jexec" instead of > >just "jexec" is sufficient here because the rc.shutdown reinitializes > >at least PATH and HOME again and the remaining variables should be not > >needed for the procedure. > > I think we should introduce an "init" process for jails.. > > It would be responsible for all that the normal init is responsible for > except for being the default parent.. (some might argue for that too). > Sending it a particular signal would notify it to > send shutdown signals to all its compatriots in the jail etc. That's what Nielsen's jailer or my kjailer(*) do. Just set jail_blah_exec to point it. (*) http://www.bsd.krakow.pl/kjailer.tbz -- Michal Belczyk
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