linux-kernel - Re: [ckrm-tech] [PATCH 7/7] containers (V7): Container interface to nsproxy subsystem

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Message-ID: <20070403154113.GA1069@sergelap.austin.ibm.com>
Date:	Tue, 3 Apr 2007 10:41:13 -0500
From:	"Serge E. Hallyn" <serue@...ibm.com>
To:	"Eric W. Biederman" <ebiederm@...ssion.com>
Cc:	vatsa@...ibm.com, "Serge E. Hallyn" <serue@...ibm.com>,
	menage@...gle.com, akpm@...l.org, pj@....com, sekharan@...ibm.com,
	dev@...ru, xemul@...ru, ckrm-tech@...ts.sourceforge.net,
	linux-kernel@...r.kernel.org, containers@...ts.osdl.org,
	mbligh@...gle.com, winget@...gle.com, rohitseth@...gle.com,
	devel@...nvz.org
Subject: Re: [ckrm-tech] [PATCH 7/7] containers (V7): Container interface to nsproxy subsystem

Quoting Eric W. Biederman (ebiederm@...ssion.com):
> Srivatsa Vaddagiri <vatsa@...ibm.com> writes:
> 
> > On Mon, Apr 02, 2007 at 09:09:39AM -0500, Serge E. Hallyn wrote:
> >> Losing the directory isn't a big deal though.  And both unsharing a
> >> namespace (which causes a ns_container_clone) and mounting the hierarchy
> >> are done by userspace, so if for some installation it is a big deal,
> >> the init scripts on initrd can mount the hierarchy before doing any
> >> unsharing.
> >
> > Yes I thought of that after posting this (that initrd can mount the
> > hierarchies), so this should not be an issue in practice ..
> >
> >> Can you think of a reason why losing a few directories matters?
> >
> > If we loose directories, then we don't have a way to manage the
> > task-group it represents thr' the filesystem interface, so I consider
> > that bad. As we agree, this will not be an issue if initrd
> > mounts the ns hierarchy atleast at bootup.
> 
> I suspect that could be a problem if we have recursive containers.
> Even by having a separate mount namespace for isolation you really
> don't want to share the mount.  If you can see all of the processes
> you do want to be able to see and control everything.

Are you asking about what happens if initrd in a vserver asks to
	mount -t container -o ns,cpusets /containers
?

I suppose in that case it would make sense to allow a separate mount
instance with it's own superblock, with s_root pointing to the dentry
for the container the vserver is in?

> I guess I want to ask before this gets to far.  Why are all of the
> namespaces lumped into one group?  I would think it would make much
> more sense to treat each namespace individually (at least for the
> user space interface).
> 
> Eric
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