[ckrm-tech] containers development plans

Paul Menage menage at google.com
Tue Jul 10 00:53:20 PDT 2007


On 7/10/07, Paul Jackson <pj at sgi.com> wrote:
> Kirill, Serge, et al,
>
> Is it fair to say then that Paul Menage's containers are primarily
> for the purposes of managing resources, while namespaces are for the
> purposes of managing identifiers?

Sort of - but one thing that we're trying to figure out how to do
nicely is integrate namespaces into the container filesystem (this was
the purpose of the post_clone() container API callback) so that we can
both get a filesystem view of task namespaces, and combine namespaces
with other process container subsystems.

>
> We've got some resources, like cpu cycles, memory bytes, network
> bandwidth, that we want to allocate and account for differentially
> by groups of tasks -- that's Menage's containers.

Plus things that aren't necessarily resource controllers, such as the
container freezer, or permissions on network ports, or userspace OOM
handlers. I don't think that lumping all of these in together as
"resource containers" is the right thing to do.

> virtualization efforts, of which my cpusets is the granddaddy example,
> being generalized by Paul Menage with his container patches.  The other
> work is, as Serge actually termed it in the body of his post, better
> called 'namespaces'.

Purely within the kernel, yes. The more general encompassing effort to
have a combined kernel/userspace solution for virtual servers is also
referred to as "containers". (And to be fair that term was already in
use when I started using the term "process containers" to refer to the
specific framework in the kernel that handles process tracking).

Paul


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