[Libvir] A sample program to create a Linux Container

[Daniel Hokka Zakrisson]

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.

Make sure you have CONFIG_USER_NS=y

> I'll post in the near future regarding CLONE_NEWNET, network support for
> containers, and the XML format.

-- 
Daniel Hokka Zakrisson