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

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Message-ID: <m1ipnpl1c9.fsf@fess.ebiederm.org>
Date:	Sun, 16 Oct 2011 02:42:14 -0700
From:	ebiederm@...ssion.com (Eric W. Biederman)
To:	"H. Peter Anvin" <hpa@...or.com>
Cc:	"Ted Ts'o" <tytso@....edu>, Kyle Moffett <kyle@...fetthome.net>,
	"J. Bruce Fields" <bfields@...ldses.org>,
	Matt Helsley <matthltc@...ibm.com>,
	Lennart Poettering <mzxreary@...inter.de>,
	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>,
	"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

"H. Peter Anvin" <hpa@...or.com> writes:

> On 10/14/2011 11:04 AM, Eric W. Biederman wrote:
>> 
>> I have found and merged a solution that allows us to name namespaces
>> without needing a namespaces for namespaces.
>> 
>
> Something based on UUIDs, perhaps?
>
> UUIDs are kind of exactly this, after all... a single namespace designed
> to be large and random enough to be globally unique without a central
> registration authority.

mount --bind /proc/self/ns/net /var/run/netns/<name>

When we want to refer to the namespace in syscalls we pass a file
descriptor we received from opening the namespace reference object.

That moves the entire naming problem into the file namespace.

Eric
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