[Docker] Driver doesn't respect CPU limit

[Daniel Kuffner]

The Nova Docker driver doesn't seem to respect the CPU limit defined by nova.
Please note I just reviewed the latest source code, haven't tested the behavior.
My assumption is that a docker container has access to all CPU resources by default.

On the docker command line this can be handled:

    docker run -c=<relative-weight> centos

[Daniel Kuffner (daniel-kuffner)]

Implementation proposal: https://review.openstack.org/#/c/59824/

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/59824
Committed: https://git.openstack.org/cgit/openstack/nova/commit/?id=751b1a04c9b14bdaf20d555e0aaa41bc276955c4
Submitter: Jenkins
Branch: master

commit 751b1a04c9b14bdaf20d555e0aaa41bc276955c4
Author: Daniel Kuffner <email address hidden>
Date: Thu Dec 5 10:34:53 2013 +0100

    Docker Driver doesn't respect CPU limit

    The docker driver doesn't respect the CPU settings of the configured
    flavor.

    Docker/LXC supports only relative cpu allocation. The relative
    cpu allocation doesn't prevent that a container can use all CPUs but it
    can at least ensure that a container with more CPUs gets more CPU
    cycles.

    DocImpact - Docker containers are now given CPU shares according to
    the vcpu setting of the flavor used when creating the container.
    Previously, the vcpu field was ignored and all containers got equal
    CPU shares, regardless of the vcpu setting.

    Change-Id: I7184eddfd8bbd2cbaa07a48ebb40bc9aa3fbd4a9
    Closes-Bug: #1256264