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Re: [Libvir] A sample program to create a Linux Container



On Fri, Jan 25, 2008 at 11:30:35AM -0800, Dave Leskovec wrote:
> Daniel Hokka Zakrisson wrote:
> >Dave Leskovec wrote:
> >  
> >>Attached is a simple program that uses the clone() function to create a
> >>container.  This is not intended as a patch - just an example of what
> >>creating a Linux Container looks like.  Something along these lines will
> >>be used by the Linux Container driver to start the domain.  The code run
> >>within this container is really simple.  It just mounts the /proc file
> >>system and then dumps the ps output to a file showing that the container
> >>is in separate process space.
> >>
> >>To run this you will need to have PID namespaces support enabled.  Turn
> >>on CONFIG_PID_NS when compiling the kernel.  You must run the program as
> >>root or the clone() call will fail.
> >>
> >>Any questions or comments are welcome.  Thanks!
> >>    
> >
> >You want to use at least CLONE_NEWIPC and CLONE_NEWUSER too. CLONE_NEWUTS
> >is probably desired as well, so you can have different hostnames, and
> >CLONE_NEWNET for networking (though that's probably not going to be usable
> >until after 2.6.25, at least).
> >
> >  
> Thanks!  I added CLONE_NEWIPC and CLONE_NEWUTS.  Adding CLONE_NEWUSER 
> caused clone() to fail.  I'm looking into that.
> 
> I'll post in the near future regarding CLONE_NEWNET, network support for 
> containers, and the XML format.

BTW, I meant to say - don't let the XML format discussions delay writing
of the actual driver code. From previous postings we've clearly got a
good common understanding of the scope of the data needed in the XML, it
is just agreeing on fine details of element names & attribute names. THis
can easily be tweaked during course of development as things become 
clearer, since its only changing XPath expressions really.

Regards,
Dan.
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