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Docker image builder for Openstack python clients

Project description

Docker image builder for Openstack clients (aka OSCs docker builder)

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A lot of people need install/update/upgrade/downgrade any Openstack python client in any time. Thanks to Docker containers it is easy to get an isolated environment with all Openstack clients of specific upstream versions that you wish.

Pre-requisites

List of prerequisites :

  • docker image: Ensure that there is an official python docker image for the provided python version parameter.
  • tox : All clients are using tox, and python version parameter will be matched in env list.
  • common release: All clients have to have the same release, in other cases you must specify a different release (by property ‘release’ in the osc.yml file) to override global release parameter. For example, in the osc.yml you may see that gnocchi client has ‘master’ release instead of ‘stable/newton’.

Build a docker image with OSCs

This module can be installed by pip:

$ pip install osc-docker-builder

Best way to get help about the command is :

osc-builder --help
usage: ocs [-h] [-bp BUILD_PATH] [-f CONFIG_FILE] [-pv PYTHON_VERSION]
           [-r RELEASE] [-c CLIENTS] [-sf] [-v]

Build a docker image with all Openstack clients that you want for a specific
upstream branch and python version

optional arguments:
  -h, --help            show this help message and exit
  -bp BUILD_PATH, --build-path BUILD_PATH
                        The build path where files are written.
  -f CONFIG_FILE, --config-file CONFIG_FILE
                        A YAML config file.
  -pv PYTHON_VERSION, --python-version PYTHON_VERSION
                        Python version for docker image
                        base(https://hub.docker.com/_/python/).For example :
                        2.7, 3.5.2
  -r RELEASE, --release RELEASE
                        Upstream release.
  -c CLIENTS, --clients CLIENTS
                        Provide all openstack python clients that you want.By
                        defaults only python-openstackclient will be
                        installed.
  -sf, --skip-fails     Skip failures and create the image.
  -v, --verbose         Show details.

Ready for action ?, suppose that you want to create a docker image for these python version and Openstack clients:

osc-builder --python-version 3.4 --clients openstack --clients heat --release stable/newton --build-path /tmp/osc-docker-builder

I recommend using a config file (which could be controlled by a version control system):

osc-builder -f osc.yml

This command can be launched form the source code. The main function will be found in osc_docker_builder package :

$ osc.py -f osc.yml -bp /tmp/osc-builder

As command execution output we have a docker image ready to be used. Push your images to your private registry or use my images at “engapa” account in dockerhub.com

Running and using docker container

For example, run a container based on latest image for python client 2.7 and release stable/newton :

$ docker run -it -d --name osc engapa/osc:2.7-stable_newton-latest
1f395d7273b99b734725fcbab4ebd05082f21978e0c4e3104cc8332c7430920d
$ docker ps
CONTAINER ID   IMAGE                               COMMAND     CREATED        STATUS       PORTS  NAMES
1f395d7273b9   engapa/osc:2.7-stable_newton-latest "/bin/bash" 2 seconds ago  Up 3 seconds        osc

For example let’s view the version of the Heat client installed in this container:

$ docker exec -it 1f395d7273b9 /bin/bash -c "heat --version"
1.5.0

If you prefer operate within the container :

$ docker attach 1f395d7273b9
root@1f395d7273b9:# pip list --format columns | grep -i "^python-.*client"
python-openstackclient         3.2.1.dev10 /src/python-openstackclient
python-saharaclient            0.18.1.dev1 /src/python-saharaclient
python-searchlightclient       1.0.1.dev1  /src/python-searchlightclient
python-senlinclient            1.0.1.dev14 /src/python-senlinclient
python-solumclient             2.1.2.dev2  /src/python-solumclient
python-swiftclient             3.1.1.dev1  /src/python-swiftclient
...
root@1f395d7273b9:/#

If you want to update all python client versions (if provided release was a branch , e.g. : master) just execute this command within the container:

$ docker attach 1f395d7273b9
root@1f395d7273b9:/root# pip install -U -r requirements.txt

An interesting module of openstack is ‘os-client-config’, it aims you to use a cloud configuration file shared by volume mount point (at “/root”, “/root/.config/openstack” or “/etc/openstack” directory):

$ cat << EOF > cloud.yml
> clouds:
>   spaincloud:
>     auth:
>       username: engapa
>       password: XXXXXXXXX
>       project_name: OSOOS
>       auth_url: 'https://spaincloud.com:5001/v2.0'
>     region_name: SpainSalamanca
>     dns_api_version: 1
> EOF
$ docker run -it --name osc -v $(pwd)/clouds.yml:/root/.config/openstack/clouds.yml engapa/osc:2.7-stable_newton-latest
root@1536ac361c6c:~# openstack --os-cloud spaincloud server list
...

Developer mode

Main tasks with code are managed by tox

To launch tests just type:

$ tox -r
...

Name                        Stmts   Miss  Cover
-----------------------------------------------
osc_docker_builder.py           0      0   100%
osc_docker_builder/osc.py     129    102    70%
-----------------------------------------------
TOTAL                         129    102    70%
----------------------------------------------------------------------
Ran 5 tests in 0.097s

OK
___________________________________________________________________________ summary ____________________________________________________________________________
  pep8: commands succeeded
  py27: commands succeeded
  py35: commands succeeded
  congratulations :)

Load the virtualenv and build a docker image :

$ source .tox/py27/bin/activate
$(py27) osc-builder -f osc.yml

Author

Enrique Garcia Pablos engapa@gmail.com

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