Publish Docker Slicing Presentation

It published the presentation done in the Functest Breakout during
last OPNFV Summit (2017 in Beijing) [1].

Minor changes are planned to update it in a second change.

Git now ignores pdf which may be generated via reveal.js.

[1] http://testresults.opnfv.org/functest/dockerslicing/

Change-Id: I2b6cf113c672320bf1bc34442bb267fd99012546
Signed-off-by: Cédric Ollivier <cedric.ollivier@orange.com>

1 files changed, 170 insertions, 0 deletions

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+# 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!
+