This repository contains Dockerfile of apache-airflow for Docker's automated build published to the public Docker Hub Registry.

• Based on Python (3.6-slim) official Image python:3.6-slim and uses the official Postgres as backend and Redis as queue
• Install Docker
• Install Docker Compose
• Following the Airflow release from Python Package Index

Pull the image from the Docker repository.

docker pull puckel/docker-airflow

For example, if you need to install Extra Packages, edit the Dockerfile and then build it.

docker build --rm -t puckel/docker-airflow .

Don't forget to update the airflow images in the docker-compose files to puckel/docker-airflow:latest.

By default, docker-airflow runs Airflow with SequentialExecutor :

docker run -d -p 8080:8080 puckel/docker-airflow webserver

If you want to run another executor, use the other docker-compose.yml files provided in this repository.

For LocalExecutor :

docker-compose -f docker-compose-LocalExecutor.yml up -d

For CeleryExecutor :

docker-compose -f docker-compose-CeleryExecutor.yml up -d

NB : If you want to have DAGs example loaded (default=False), you've to set the following environment variable :

LOAD_EX=n

docker run -d -p 8080:8080 -e LOAD_EX=y puckel/docker-airflow

If you want to use Ad hoc query, make sure you've configured connections: Go to Admin -> Connections and Edit "postgres_default" set this values (equivalent to values in airflow.cfg/docker-compose*.yml) :

• Host : postgres
• Schema : airflow
• Login : airflow
• Password : airflow

For encrypted connection passwords (in Local or Celery Executor), you must have the same fernet_key. By default docker-airflow generates the fernet_key at startup, you have to set an environment variable in the docker-compose (ie: docker-compose-LocalExecutor.yml) file to set the same key accross containers. To generate a fernet_key :

docker run puckel/docker-airflow python -c "from cryptography.fernet import Fernet; FERNET_KEY = Fernet.generate_key().decode(); print(FERNET_KEY)"

It's possible to set any configuration value for Airflow from environment variables, which are used over values from the airflow.cfg.

The general rule is the environment variable should be named AIRFLOW__<section>__<key>, for example AIRFLOW__CORE__SQL_ALCHEMY_CONN sets the sql_alchemy_conn config option in the [core] section.

Check out the Airflow documentation for more details

You can also define connections via environment variables by prefixing them with AIRFLOW_CONN_ - for example AIRFLOW_CONN_POSTGRES_MASTER=postgres://user:password@localhost:5432/master for a connection called "postgres_master". The value is parsed as a URI. This will work for hooks etc, but won't show up in the "Ad-hoc Query" section unless an (empty) connection is also created in the DB

Airflow allows for custom user-created plugins which are typically found in ${AIRFLOW_HOME}/plugins folder. Documentation on plugins can be found here

In order to incorporate plugins into your docker container

• Create the plugins folders plugins/ with your custom plugins.
• Mount the folder as a volume by doing either of the following:
  • Include the folder as a volume in command-line -v $(pwd)/plugins/:/usr/local/airflow/plugins
  • Use docker-compose-LocalExecutor.yml or docker-compose-CeleryExecutor.yml which contains support for adding the plugins folder as a volume

• Create a file "requirements.txt" with the desired python modules
• Mount this file as a volume -v $(pwd)/requirements.txt:/requirements.txt (or add it as a volume in docker-compose file)
• The entrypoint.sh script execute the pip install command (with --user option)

• Airflow: localhost:8080
• Flower: localhost:5555

Easy scaling using docker-compose:

docker-compose -f docker-compose-CeleryExecutor.yml scale worker=5

This can be used to scale to a multi node setup using docker swarm.

If you want to run other airflow sub-commands, such as list_dags or clear you can do so like this:

docker run --rm -ti puckel/docker-airflow airflow list_dags

or with your docker-compose set up like this:

docker-compose -f docker-compose-CeleryExecutor.yml run --rm webserver airflow list_dags

You can also use this to run a bash shell or any other command in the same environment that airflow would be run in:

docker run --rm -ti puckel/docker-airflow bash
docker run --rm -ti puckel/docker-airflow ipython

Fork, improve and PR. ;-)