martin-kokos commented on a change in pull request #7832: Add production image support URL: https://github.com/apache/airflow/pull/7832#discussion_r400914471
########## File path: IMAGES.rst ########## @@ -0,0 +1,304 @@ + + .. Licensed to the Apache Software Foundation (ASF) under one +or more contributor license agreements. See the NOTICE file +distributed with this work for additional information +regarding copyright ownership. The ASF licenses this file +to you under the Apache License, Version 2.0 (the +"License"); you may not use this file except in compliance +with the License. You may obtain a copy of the License at + + .. http://www.apache.org/licenses/LICENSE-2.0 + + .. Unless required by applicable law or agreed to in writing, +software distributed under the License is distributed on an +"AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY +KIND, either express or implied. See the License for the +specific language governing permissions and limitations +under the License. + +.. contents:: :local: + +Airflow docker images +===================== + +Airflow has two images (build from Dockerfiles): + +* CI image (Dockerfile.ci) - used for running tests and local development +* Production image (Dockerfile) - used to run production-ready Airlfow installations + +Image naming conventions +======================== + +The images are named as follows: + +``apache/airflow:<BRANCH_OR_TAG>-python<PYTHON_MAJOR_MINOR_VERSION>[-ci][-manifest]`` + +where: + +* BRANCH_OR_TAG - branch or tag used when creating the image. Examples: master, v1-10-test, 1.10.10 + The ``master`` and ``v1-10-test`` labels are built from branches so they change over time. the 1.10.* and in + the future ``2.*`` labels are build from git tags and they are "fixed" once built. +* PYTHON_MAJOR_MINOR_VERSION - version of python used to build the image. Examples: 3.5, 3.7 +* The ``-ci`` suffix is added for CI images +* The ``-manifest`` is added for manifest images (see below for explanation of manifest images) + +Building docker images +====================== + +The easiest way to build those images is to use `<BREEZE.rst>`_. + +You can build the CI image using this command: + +.. code-block:: + + ./breeze build-image + +You can build production image using this command: + +.. code-block:: + + ./breeze build-image --production-image + +By adding ``--python <PYTHON_MAJOR_MINOR_VERSION>`` parameter you can build the +image version for the chosen python version. + +The images are build with default extras - different extras for CI and production image and you +can change the extras via the ``--extras`` parameters. You can see default extras used via +``./breeze flags``. + +For example if you want to build python 3.7 version of production image with +"all" extras installed you should run this command: + +.. code-block:: + + ./breeze build-image --python 3.7 --extras "all" --production-image + +The command that builds the CI image are optimized to minimize the time needed to rebuild the image when +the source code of Airflow evolves. This means that if you already have the image locally downloaded and +built, the scripts will determine whether the rebuild is needed in the first place. Then the scripts will +make sure that minimal number of steps are executed to rebuild parts of the image (for example, +PIP dependencies) and will give you an image consistent with the one used during Continuous Integration. + +The command that build the production image are optimised for size of the image. + +In Breeze by default the images with are built using local sources of Apache Airflow. However +you can also build production images from github sources - providing ``--install-airflow-version`` +parameter to Breeze. This will install airflow inside the production image using sources downloaded from +specified tag or branch. Internally airflow will be installed using the command: + +.. code-block:: + + pip install https://github.com/apache/airflow/archive/<tag>>.tar.gz#egg=apache-airflow \ + --constraint https://raw.githubusercontent.com/apache/airflow/<tag>/requirements/requirements-python3.7.txt + + +Technical details of Airflow images +=================================== + +The CI image is used by Breeze as shell image but it is also used during CI builds on Travis. +The image is single segment image that contains Airflow installation with "all" dependencies installed. +It is optimised for rebuild speed (AIRFLOW_CONTAINER_CI_OPTIMISED_BUILD flag set to "true"). +It installs PIP dependencies from the current branch first - so that any changes in setup.py do not trigger +reinstalling of all dependencies. There is a second step of installation that re-installs the dependencies +from the latest sources so that we are sure that latest dependencies are installed. + +The production image is a multi-segment image. The first segment "airflow-build-image" contains all the +build essentials and related dependencies that allow to install airflow locally. By default the image is +build from a released version of Airflow from Github, but by providing some extra arguments you can also +build it from local sources. This is particularly useful in CI environment where we are using the image +to run Kubernetes tests. See below for the list of arguments that should be provided to build +production image from the local sources. + +Note! Breeze by default builds production image from local sources. You can change it's behaviour by +providing ``--install-airflow-version`` parameter, where you can specify the +tag/branch used to download Airflow package from in github repository. You can +also change the repository itself by adding --dockerhub-user and --dockerhub-repo flag values. + +Manually building the images +---------------------------- + +You can build the default production image with standard ``docker build`` command but they will only build +default versions of the image and will not use the dockerhub versions of images as cache. + + +CI images +......... + +The following arguments can be used for CI images: + +* ARG PYTHON_BASE_IMAGE="python:3.6-slim-buster" - Base python image +* ARG AIRFLOW_VERSION="2.0.0.dev0" - version of Airflow +* ARG PYTHON_MAJOR_MINOR_VERSION="3.6" - major/minor version of Python (should match base image) +* ARG DEPENDENCIES_EPOCH_NUMBER="2" - increasing this number will reinstall all apt dependencies +* ARG KUBECTL_VERSION="v1.15.3" - version of kubectl installed +* ARG KIND_VERSION="v0.6.1" - version of kind installed +* ARG PIP_NO_CACHE_DIR="true" - if true, then no pip cache will be stored +* ARG PIP_VERSION="19.0.2" - version of PIP to use +* ARG HOME=/root - Home directory of the root user (CI image has root user as default) +* ARG AIRFLOW_HOME=/root/airflow - Airflow's HOME (that's where logs and sqlite databases are stored) +* ARG AIRFLOW_SOURCES=/opt/airflow - Mounted sources of Airflow +* ARG PIP_DEPENDENCIES_EPOCH_NUMBER="3" - increasing that number will reinstall all PIP dependencies +* ARG CASS_DRIVER_NO_CYTHON="1" - if set to 1 no CYTHON compilation is done for cassandra driver (much faster) +* ARG AIRFLOW_CONTAINER_CI_OPTIMISED_BUILD="true" if set then PIP dependencies are installed from repo first + before they are reinstalled from local sources. This allows for incremental faster builds when + requirements change +* ARG AIRFLOW_REPO=apache/airflow - the repository from which PIP dependencies are installed (CI optimised) +* ARG AIRFLOW_BRANCH=master - the branch from which PIP dependencies are installed (CI optimised) +* ARG AIRFLOW_CI_BUILD_EPOCH="1" - increasing this value will reinstall PIP dependencies from the repository + from scratch +* ARG AIRFLOW_EXTRAS="all" - extras to install +* ARG ADDITIONAL_PYTHON_DEPS="" - additional python dependencies to install + +Here are some examples of how CI images can built manually. CI is always built from local sources. + +This builds the CI image in version 3.7 with default extras ("all"). + +.. code-block:: + + docker build . -f Dockerfile.ci --build-arg PYTHON_BASE_IMAGE="python:3.7-slim-buster" \ + --build-arg PYTHON_MAJOR_MINOR_VERSION=3.7 + + +This builds the CI image in version 3.7 with default extras ("all"). + +.. code-block:: + + docker build . -f Dockerfile.ci --build-arg PYTHON_BASE_IMAGE="python:3.7-slim-buster" \ + --build-arg PYTHON_MAJOR_MINOR_VERSION=3.7 + +This builds the CI image in version 3.7 with just extras ("all"). + +.. code-block:: + + docker build . -f Dockerfile.ci --build-arg PYTHON_BASE_IMAGE="python:3.7-slim-buster" \ + --build-arg PYTHON_MAJOR_MINOR_VERSION=3.7 + + +Production images +................. + +The following arguments can be used for CI images: + +* ARG PYTHON_BASE_IMAGE="python:3.6-slim-buster" - Base python image +* ARG PYTHON_MAJOR_MINOR_VERSION="3.6" - major/minor version of Python (should match base image) +* ARG AIRFLOW_VERSION="2.0.0.dev0" - version of Airflow +* ARG AIRFLOW_ORG="apache" - Github organisation from which Airflow is installed (when installed from repo) +* ARG AIRFLOW_REPO="airflow" - Github repository from which Airflow is installed (when installed from repo) +* ARG AIRFLOW_GIT_REFERENCE="master" - reference (branch or tag) from Github repository from which + Airflow is installed (when installed from repo) +* ARG REQUIREMENTS_GIT_REFERENCE="master" - reference (branch or tag) from Github repository from which + requirements are downloaded for constraints (when installed from repo). +* ARG WWW_FOLDER="www" - folder where www pages are generated - it should be set to www_rbac in case + of 1.10 image builds. +* ARG AIRFLOW_EXTRAS=(see Dockerfile) Default extras with which airflow is installed +* ARG AIRFLOW_HOME=/opt/airflow - Airflow's HOME (that's where logs and sqlite databases are stored) +* ARG AIRFLOW_UID="50000" - Airflow user UID +* ARG AIRFLOW_GID="50000" - Airflow group GID +* ARG PIP_VERSION="19.0.2" - version of PIP to use +* ARG CASS_DRIVER_BUILD_CONCURRENCY="8" - Number of processors to use for cassandra PIP install (speeds up + installing in case cassandra extra is used). Review comment: ``` Argument | Example value | Description -- | -- | -- ``PYTHON_BASE_IMAGE`` | ``python:3.6-slim-buster`` | Base python image ``PYTHON_MAJOR_MINOR_VERSION`` | ``3.6`` | major/minor version of Python (should match base image) ``AIRFLOW_VERSION`` | ``2.0.0.dev0`` | version of Airflow ``AIRFLOW_ORG`` | ``apache`` | Github organisation from which Airflow is installed (when installed from repo) ``AIRFLOW_REPO`` | ``airflow`` | Github repository from which Airflow is installed (when installed from repo) ``AIRFLOW_GIT_REFERENCE`` | ``master`` | reference (branch or tag) from Github repository from which Airflow is installed (when installed from repo) ``REQUIREMENTS_GIT_REFERENCE`` | ``master`` | reference (branch or tag) from Github repository from which requirements are downloaded for constraints (when installed from repo). ``WWW_FOLDER`` | ``www`` - folder where www pages are generated | it should be set to www_rbac in case of 1.10 image builds. ``AIRFLOW_EXTRAS`` | (see Dockerfile) | Default extras with which airflow is installed ``AIRFLOW_HOME`` | ``/opt/airflow`` | Airflow's HOME (that's where logs and sqlite databases are stored) ``AIRFLOW_UID`` | ``50000`` | Airflow user UID ``AIRFLOW_GID`` | ``50000`` | Airflow group GID ``PIP_VERSION`` | ``19.0.2`` | version of PIP to use ``CASS_DRIVER_BUILD_CONCURRENCY`` | ``8`` | Number of processors to use for cassandra PIP install (speeds up installing in case cassandra extra is used). ``` ---------------------------------------------------------------- This is an automated message from the Apache Git Service. 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