Two newbie questions on containers

Daniel Lezcano daniel.lezcano at
Wed Jan 12 06:17:51 PST 2011

On 01/12/2011 01:02 AM, Nathan Lynch wrote:
> Hi Timur,
> On Tue, 2011-01-11 at 16:08 -0600, Timur Tabi wrote:
>> I'm in the process of learning about Linux containers, including cgroups, and
>> the learning curve seems pretty steep to me.  So I have a couple newbie
>> questions for all of you.  Any detailed answered are greatly appreciated.
>> 1) For the PowerPC architecture, is there anything that is "missing"?  I can't
>> really tell how much of cgroups and lxc is architecture-specific, and there
>> appears to be PowerPC support for both already.  I'd like to know if this
>> another one of those areas, like KVM, where x86 is fully implemented and PowerPC
>> support is lagging.
> cgroups and the lxc utilities work just as well on powerpc as they do on
> x86; there's nothing arch-specific about them.

On PowerPC, the network physical driver (at the hypervisor level) will 
prevent different LPAR to communicate on the same blade if the network 
is virtualized.

>> 2) Given a random device driver, like a driver for a serial port, is there an
>> opportunity for the driver to be enhanced to support cgroups or lxc?  Doing a
>> simple search of the kernel source code, I don't really see any drivers making
>> calls into any cgroup code, so I don't understand how to restrict device access
>> to a specific container or cgroup.
> Not totally sure about this myself, but have you read
> Documentation/cgroups/devices.txt in the kernel source yet?
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