linux-kernel - Re: [RFC][PATCH 0/9] Make containers kernel objects

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Date:   Tue, 23 May 2017 18:35:30 +0800
From:   Ian Kent <raven@...maw.net>
To:     James Bottomley <James.Bottomley@...senPartnership.com>,
        Jeff Layton <jlayton@...hat.com>,
        David Howells <dhowells@...hat.com>, trondmy@...marydata.com
Cc:     mszeredi@...hat.com, linux-nfs@...r.kernel.org,
        linux-kernel@...r.kernel.org, viro@...iv.linux.org.uk,
        linux-fsdevel@...r.kernel.org, cgroups@...r.kernel.org,
        ebiederm@...ssion.com,
        Linux Containers <containers@...ts.linux-foundation.org>
Subject: Re: [RFC][PATCH 0/9] Make containers kernel objects

On Mon, 2017-05-22 at 12:21 -0700, James Bottomley wrote:
> 
> > > >  (3) nfsdcltrack.  A way for NFSD to access stable storage for 
> > > > tracking of persistent state.  Again, network-namespace 
> > > > dependent, but also perhaps mount-namespace dependent.
> > 
> > Definitely mount-namespace dependent.
> > 
> > > 
> > > So again, given we can set this up to work today, this sounds like 
> > > more a restriction that will bite us than an enhancement that gives 
> > > us extra features.
> > > 
> > 
> > How do you set this up to work today?
> 
> Well, as above, it spawns into the root, you jump it to where it should
> be and re-execute or simply handle in the host. 
> 
> > AFAIK, if you want to run knfsd in a container today, you're out of 
> > luck for any non-trivial configuration.
> 
> Well "running knfsd in a container" is actually different from having a
> containerised nfs export.  My understanding was that thanks to the work
> of Stas Kinsbursky, the latter has mostly worked since the 3.9 kernel
> for v3 and below.  I assume the current issue is that there's a problem
> with v4?

Oh, ok, I thought that, say, a docker (NFS) volumes-from a container to another
container didn't work for any version of NFS.

Certainly didn't work last time I tried, it was a while ago though.

Ian