linux-kernel - Re: Detecting if you are running in a container

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Message-ID: <m1lisshvbk.fsf@fess.ebiederm.org>
Date:	Mon, 10 Oct 2011 23:54:39 -0700
From:	ebiederm@...ssion.com (Eric W. Biederman)
To:	Lennart Poettering <mzxreary@...inter.de>
Cc:	Matt Helsley <matthltc@...ibm.com>,
	Kay Sievers <kay.sievers@...y.org>,
	linux-kernel@...r.kernel.org, harald@...hat.com, david@...ar.dk,
	greg@...ah.com, Linux Containers <containers@...ts.osdl.org>,
	Linux Containers <lxc-devel@...ts.sourceforge.net>,
	"Serge E. Hallyn" <serge@...lyn.com>,
	Daniel Lezcano <daniel.lezcano@...e.fr>,
	Paul Menage <paul@...lmenage.org>
Subject: Re: Detecting if you are running in a container

Lennart Poettering <mzxreary@...inter.de> writes:

> On Mon, 10.10.11 13:59, Eric W. Biederman (ebiederm@...ssion.com) wrote:

>> My list of things that still have work left to do looks like:
>> - cgroups.  It is not safe to create a new hierarchies with groups
>>   that are in existing hierarchies.  So cgroups don't work.
>
> Well, for systemd they actually work quite fine since systemd will
> always place its own cgroups below the cgroup it is started in. cgroups
> hence make these things nicely stackable.
>
> In fact, most folks involved in cgroups userspace have agreed to these
> rules now:
>
> http://www.freedesktop.org/wiki/Software/systemd/PaxControlGroups

Wow.   Are cgroups really that complicated to use?  A list of rules
a page long on what you have to do to make them useful and non-conflict.
Something seems off.  Perhaps we need a rule don't mount multiple
controllers in the same hierarchy.

Eric
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