linux-kernel - Re: How much of a mess does OpenVZ make? ;) Was: What can OpenVZ do?

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Date:	Fri, 27 Feb 2009 15:33:59 +0100
From:	Cedric Le Goater <legoater@...e.fr>
To:	Alexey Dobriyan <adobriyan@...il.com>
CC:	Greg Kurz <gkurz@...ibm.com>, linux-api@...r.kernel.org,
	containers@...ts.linux-foundation.org, mpm@...enic.com,
	linux-kernel@...r.kernel.org,
	Dave Hansen <dave@...ux.vnet.ibm.com>, linux-mm@...ck.org,
	tglx@...utronix.de, viro@...iv.linux.org.uk, hpa@...or.com,
	Ingo Molnar <mingo@...e.hu>, torvalds@...ux-foundation.org,
	Andrew Morton <akpm@...ux-foundation.org>, xemul@...nvz.org
Subject: Re: How much of a mess does OpenVZ make? ;) Was: What can OpenVZ
 do?

> How do you restore set of uts_namespace's?

	clone(CLONE_NEWUTS);
	sethostname(...)

> Kernel never exposes to userspace which are the same, which are independent.
 
I think you are addressing the problem from a kernel POV. If you see it
from the user POV, what he cares about is what the gethostname() returns 
and not 'struct uts_namespace'. 

that doesn't mean that C/R shouldn't be aware of the kernel implementation
but if you think in terms of user API, it makes life a easier.

Cheers,

C.
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