linux-kernel - Re: [RFC] catching sys

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Message-ID: <20110820110308.GA1906@ucw.cz>
Date:	Sat, 20 Aug 2011 13:03:08 +0200
From:	Pavel Machek <pavel@....cz>
To:	Daniel Lezcano <daniel.lezcano@...e.fr>
Cc:	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	LXC Development <Lxc-devel@...ts.sourceforge.net>
Subject: Re: [RFC] catching sys_reboot syscall

Hi!

> In this case, the container shutdowns correctly but, at the end, the
> init process is waiting indefinitely and we have the containers stuck
> with one process (the init process).
> 
> In order to fix that, we used a hypervisor process, parent of the
> container's init process, watching for the container's utmp file and
> detecting when the runlevel changes. When this runlevel change is
> detected we wait for the container to have one process left and then we
> kill the container's init.
> 
> That works well if we modify the distro configuration files, we make
> /var/run to not be a tmpfs and we remove all the files inside this
> directory when the container boots. *But* as soon as we upgrade the
> container distro, all the tweaks are lost. So this method works but at
> the cost of tweaking the containers configuration files again and again,
> each time there is an update, which is not tolerable in a production
> environment.
> 
> This problem is easy to solve with a small hack in the kernel:

Hmm. If you just made sys_reboot() equivalent to exit() for container
case... perhaps patch would be even simpler..?

-- 
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(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html
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