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diff --git a/docs/com/pres/dockerslicing/dockerslicing.md b/docs/com/pres/dockerslicing/dockerslicing.md new file mode 100644 index 000000000..55fb2557a --- /dev/null +++ b/docs/com/pres/dockerslicing/dockerslicing.md @@ -0,0 +1,170 @@ +# Docker slicing + +[Cédric Ollivier](mailto:cedric.ollivier@orange.com) + +OPNVF Summit 2017 (Beijing) + + + +## Current issues + + +### Dockerfile + +- it copies all the files hosted by the third-party projects (eg docs, .git...) +- several requirements are downgraded/upgraded when building the container as they are managed one after the other +- it could download packages from [PyPI](https://pypi.python.org/pypi) (e.g. [rally](https://pypi.python.org/pypi/rally/)...) instead of cloning git repository +- build dependencies can't be removed to save space as it creates multiple layers (>70) + + +### setup.py + +- no requirement is installed when calling *python setup.py install* as none of the next keys are set: + - install_requires + - tests_require + - dependency_links +- shell scripts are not installed neither in $PATH nor in dist-packages + + +### setup.py + +- master is considered as an incorrect version +- empty package_data seems useless +- zip_safe flag could be set as False as \__file__ would prevent functest from working in a zipfile +- py_modules should not list cli_base as it was moved into functest package + + + +## Proposals + + +### why not relying on [pbr](https://docs.openstack.org/developer/pbr/)? + +- pbr injects requirements into the install_requires, tests_require and/or dependency_links arguments to setup +- it supports conditional dependencies which can be added to the requirements (e.g. subprocess32; python_version=='2.7') + + +### setup.py + +```python +#!/usr/bin/env python + +from setuptools import setup + +setup( + setup_requires=['pbr>=1.9', 'setuptools>=17.1'], + pbr=True, +) +``` + + +### setup.cfg + +```ini +[metadata] +name = functest +version = 5 +home-page = https://wiki.opnfv.org/display/functest + +[files] +packages = functest +scripts = + docker/docker_remote_api/enable_remote_api.sh + docker/add_images.sh + docker/config_install_env.sh + +[entry_points] +console_scripts = + functest = functest.cli.cli_base:cli +``` + + +### Split requirements into (at least) 3 files + +- **requirements.txt** which could list all abstract (i.e. [not associated with any particular index](https://packaging.python.org/requirements/)) dependencies of the functest package +- **test-requirements.txt** which could list all abstract dependencies required for testing the functest package +- **thirdparty-requirements.txt** which could list all abstract and concrete dependencies required by the full functest docker container + + +### tox.ini + +```ini +[testenv] +usedevelop = True +deps = + -r{toxinidir}/requirements.txt + -r{toxinidir}/test-requirements.txt + git+https://gerrit.opnfv.org/gerrit/releng#egg=opnfv&subdirectory=modules + git+https://gerrit.opnfv.org/gerrit/barometer#egg=baro_tests + git+https://gerrit.opnfv.org/gerrit/snaps#egg=snaps + +``` + + +### Dockerfile + +``` +RUN pip install \ + git+https://gerrit.opnfv.org/gerrit/functest@$BRANCH#egg=functest \ + git+https://gerrit.opnfv.org/gerrit/releng@$BRANCH#egg=opnfv\&subdirectory=modules \ + git+https://gerrit.opnfv.org/gerrit/barometer@$BRANCH#egg=baro_tests \ + git+https://gerrit.opnfv.org/gerrit/snaps@$BRANCH#egg=snaps +``` + + +### Switch to Alpine + +``` +FROM alpine:3.5 + +RUN apk --no-cache add --update \ + python libffi libssl1.0 libjpeg-turbo py-pip && \ + apk --no-cache add --virtual .build-deps --update \ + python-dev build-base linux-headers libffi-dev \ + openssl-dev libjpeg-turbo-dev git && \ + pip install git+https://gerrit.opnfv.org/gerrit/releng#egg=opnfv\&subdirectory=modules \ + git+https://gerrit.opnfv.org/gerrit/barometer#egg=baro_tests \ + git+https://gerrit.opnfv.org/gerrit/snaps#egg=snaps \ + git+https://gerrit.opnfv.org/gerrit/functest@$BRANCH#egg=functest && \ + apk del .build-deps +``` + + +### Status + + - the change [**"leveraging on pbr"**](https://gerrit.opnfv.org/gerrit/#/c/35813/) can be merged + - docker containers have been published (any test is welcome): + - [ollivier/functest-pbr](https://hub.docker.com/r/ollivier/functest-pbr/) + - [ollivier/functest-alpine](https://hub.docker.com/r/ollivier/functest-alpine/) + - the Dockerfile switching to Alpine can be published too + + + +## Next steps + + +### docker slicing + +the previous alpine example could be the base image and we could simply create other images from it (see [FROM](https://docs.docker.com/engine/reference/builder/#from)) by installing all third party python packages + + +### PyPI + +functest could be published to the [Python Package Index](https://pypi.python.org/pypi) and then we would stop listing urls + + + +## on the road + + +### We could be faced with issues + +- several test cases can fail if their requirements are incomplete in setup.py (we should help them to fix it) +- all conditions for requirements may not be compatible (OpenStack requirements as a guideline?) +- we should fix lots of hardcoded paths hidden by the previous design +- some files could be outside the python package (e.g. functest ci scripts) + + + +## Thank You! + |