[Devel] Re: [PATCH 1/1] containers: implement nsproxy containers subsystem

[Serge E. Hallyn]

Quoting Pavel Emelianov (xemul at openvz.org):
> Serge E. Hallyn wrote:
> > Quoting Pavel Emelianov (xemul at openvz.org):
> >> Serge E. Hallyn wrote:
> >>> >From 190ea72d213393dd1440643b2b87b5b2128dff87 Mon Sep 17 00:00:00 2001
> >>> From: Serge E. Hallyn <serue at us.ibm.com>
> >>> Date: Mon, 4 Jun 2007 14:18:52 -0400
> >>> Subject: [PATCH 1/1] containers: implement nsproxy containers subsystem
> >>>
> >>> When a task enters a new namespace via a clone() or unshare(), a new
> >>> container is created and the task moves into it.  This enables
> >> I have a design question.
> >>
> >> How the child that has a new namespace guesses what id
> >> this namespace has in containers?
> > 
> > parse /proc/$$/container
> 
> Ok.
> 
> > So more likely the parent would have to grab the cloned pid of the
> > child, parse /proc/$$/container, then rename the container.
> 
> Child can happen to die before this and we'll have an orphaned
> container. I mean, it will be deletable, but its name will be unknown.

Can we address that with a release_agent?

Or, the program which did the unshare() (or the fn which was cloned())
can print out it's /proc/getpid()/container before it (optionally resets
stdout and) executes the actual program to be run in the container.

> Maybe its better to get the containers id from the pid of new task?

Hmm, that seems reasonable.  In fact I like it.

Good idea, thanks.  I think I'll go ahead and implement that.

-serge