Image building
==============

The ``tools/build.py`` script in this repository is
responsible for building docker images.

Guide
-----

In general, you will build images like this:

::

    $ tools/build.py

By default, the above command would build all images based on centos image.

If you want to change the base distro image, add ``-b``:

::

    $ tools/build.py -b ubuntu

There are following distros available for building images:

- fedora
- centos
- oraclelinux
- ubuntu

To push the image after building, add ``--push``:

::

    $ tools/build.py --push


If you want to build only keystone image, use the following command:

::

    $ tools/build.py keystone


If you want to build multiple images e.g. keystone and nova, use the following command:

::

    $ tools/build.py keystone nova


``tools/build.py`` use ``kollaglue`` as default namespace. If you
want to push images to your dockerhub, change the namespace like:

::

   $ tools/build.py -n yourusername --push

The build script reads its configuration from ``/etc/kolla/kolla-build.conf``
or ``etc/kolla/kolla-build.conf``. This is where to change the default
settings.


Build OpenStack from Source
---------------------------

When building images, there are two methods of the OpenStack install.
One is ``binary``. Another is ``source``.
The ``binary`` means that OpenStack will be installed from apt/yum.
And the ``source`` means that OpenStack will be installed from source code.
The default method of the OpenStack install is ``binary``.
You can change it to ``source`` using the following command:

::

    tools/build.py -t source

The locations of OpenStack source code are written in
``etc/kolla/kolla-build.conf``.
Now the source type support ``url`` and ``git``. The
``etc/kolla/kolla-build.conf`` looks like:

::

    [glance-base]
    type = url
    location = http://tarballs.openstack.org/glance/glance-master.tar.gz

    [keystone]
    type = git
    location = https://github.com/openstack/keystone
    reference = stable/kilo

To build RHEL containers, it is necessary to use the -i (include header)
feature to include registration with RHN of the container runtime operating
system.  To obtain a RHN username/password/pool id, contact Red Hat.

First create a file called rhel-include:

::

    RUN subscription-manager register --user=<user-name> --password=<password> \
    && subscription-manager attach --pool <pool-id>

Then build RHEL containers:

::

    build -b rhel -i ./rhel-include



Known issues
------------


1. Can't build base image because docker fails to install systemd.


   There are some issue between docker and AUFS. The simple workaround
   to avoid the issue is that add ``-s devicemapper`` to ``DOCKER_OPTS``.
   Get more information about the issue from DockerBug_.


.. _DockerBug: https://github.com/docker/docker/issues/6980