On Thu, Jul 15, 2004 at 07:19:09PM +0200, Andries Brouwer wrote:
> On Thu, Jul 15, 2004 at 01:31:08PM +0100, Paul Jakma wrote:
> 
> > speaking of which, how does one use namespaces exactly? The kernel 
> > appears to maintain mount information per process, but how do you set 
> > this up?
> > 
> > neither 'man mount/namespace' nor 'appropos namespace' show up 
> > anything.
> 
> Try "man 2 clone" and look for CLONE_NEWNS.
> 
> Somewhere else I wrote
> 
>   Since 2.4.19/2.5.2, the clone() system call, a generalization of
>   Unix fork() and BSD vfork(), may have the CLONE_NEWNS flag, that
>   says that all mount information must be copied. Afterwards, mount,
>   chroot, pivotroot and similar namespace changing calls done by this
>   new process do influence this process and its children, but not other
>   processes. In particular, the virtual file /proc/mounts that lists the
>   mounted filesystems, is now a symlink to /proc/self/mounts - different
>   processes may live in entirely different file hierarchies.
> 
> Andries

Or your page at

  http://www.win.tue.nl/~aeb/linux/lk/lk-6.html

...which contains a working utility (section 6.3.3).

Attached an adopted version. Call like 'newnamespace /bin/bash' to
start bash in a new namespace.

-- 
Rutger Nijlunsing ---------------------------- rutger ed tux tmfweb nl
never attribute to a conspiracy which can be explained by incompetence
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