linux-kernel - Re: [RFC PATCH 02/27] containers: Implement containers as kernel objects

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Message-ID: <1550634367.11684.6.camel@HansenPartnership.com>
Date:   Tue, 19 Feb 2019 19:46:07 -0800
From:   James Bottomley <James.Bottomley@...senPartnership.com>
To:     Ian Kent <raven@...maw.net>, David Howells <dhowells@...hat.com>
Cc:     keyrings@...r.kernel.org, trond.myklebust@...merspace.com,
        sfrench@...ba.org, linux-security-module@...r.kernel.org,
        linux-nfs@...r.kernel.org, linux-cifs@...r.kernel.org,
        linux-fsdevel@...r.kernel.org, rgb@...hat.com,
        linux-kernel@...r.kernel.org,
        containers@...ts.linux-foundation.org, cgroups@...r.kernel.org
Subject: Re: [RFC PATCH 02/27] containers: Implement containers as kernel
 objects

On Wed, 2019-02-20 at 11:04 +0800, Ian Kent wrote:
> On Tue, 2019-02-19 at 18:20 -0800, James Bottomley wrote:
> > On Tue, 2019-02-19 at 23:06 +0000, David Howells wrote:
> > > James Bottomley <James.Bottomley@...senPartnership.com> wrote:
> > > 
> > > > I thought we got agreement years ago that containers don't
> > > > exist in Linux as a single entity: they're currently a
> > > > collection of cgroups and namespaces some of which may and some
> > > > of which may not be local to the entity the orchestration
> > > > system thinks of as a "container".
> > > 
> > > I wasn't party to that agreement and don't feel particularly
> > > bound by it.
> > 
> > That's not at all relevant, is it?  The point is we have widespread
> > uses of namespaces and cgroups that span containers today meaning
> > that a "container id" becomes a problematic concept.  What we
> > finally got to with the audit people was an unmodifiable label
> > which the orchestration system can set ... can't you just use that?
> 
> Sorry James, I fail to see how assigning an id to a collection of
> objects constitutes a problem or how that could restrict the way a
> container is used.

Rather than rehash the whole argument again, what's the reason you
can't use the audit label?  It seems to do what you want in a way that
doesn't cause problems.  If you can just use it there's little point
arguing over what is effectively a moot issue.

James


> Isn't the only problem here the current restrictions on the way
> objects need to be combined as a set and the ability to be able add
> or subtract from that set.
> 
> Then again the notion of active vs. inactive might not be sufficient
> to allow for the needed flexibility ...
> 
> Ian
>