# INSTALL / BUILD instructions for Apache Airflow

This ia a generic installation method that requires a number of dependencies to be installed.

Depending on your system you might need different prerequisites, but the following
systems/prerequisites are known to work:

Linux (Debian Buster and Linux Mint Tricia):

sudo apt install build-essentials python3.6-dev python3.7-dev python-dev openssl \
                 sqlite sqlite-dev default-libmysqlclient-dev libmysqld-dev postgresq

MacOS (Mojave/Catalina):

brew install sqlite mysql postgresql

# [required] fetch the tarball and untar the source move into the directory that was untarred.

# [optional] run Apache RAT (release audit tool) to validate license headers
# RAT docs here: https://creadur.apache.org/rat/. Requires Java and Apache Rat
java -jar apache-rat.jar -E ./.rat-excludes -d .

# [optional] Airflow pulls in quite a lot of dependencies in order
# to connect to other services. You might want to test or run Airflow
# from a virtual env to make sure those dependencies are separated
# from your system wide versions

python3 -m venv PATH_TO_YOUR_VENV
source PATH_TO_YOUR_VENV/bin/activate

NOTE!!

On November 2020, new version of PIP (20.3) has been released with a new, 2020 resolver. This resolver
does not yet work with Apache Airflow and might leads to errors in installation - depends on your choice
of extras. In order to install Airflow you need to either downgrade pip to version 20.2.4
``pip upgrade --pip==20.2.4`` or, in case you use Pip 20.3, you need to add option
``--use-deprecated legacy-resolver`` to your pip install command.

# [required] building and installing by pip (preferred)
pip install .

# or directly
python setup.py install

# You can also install recommended version of the dependencies by using
# constraint-python<PYTHON_MAJOR_MINOR_VERSION>.txt files as constraint file. This is needed in case
# you have problems with installing the current requirements from PyPI.
# There are different constraint files for different python versions. For example"

pip install . \
  --constraint "https://raw.githubusercontent.com/apache/airflow/constraints-master/constraints-3.6.txt"


By default `pip install` in Airflow 2.0 installs only the provider packages that are needed by the extras,
however if you want to install all providers (which was default behaviour in 1.10.*)
you can do it by setting environment variable INSTALL_PROVIDERS_FROM_SOURCES to `true`.


INSTALL_PROVIDERS_FROM_SOURCES="true" pip install . \
  --constraint "https://raw.githubusercontent.com/apache/airflow/constraints-master/constraints-3.6.txt"


You can also install airflow in "editable mode" (with -e) flag and then provider packages will be
available, because they are used directly from the airflow sources:


pip install -e . \
  --constraint "https://raw.githubusercontent.com/apache/airflow/constraints-master/constraints-3.6.txt"


# You can also install Airflow with extras specified. The list of available extras:
# START EXTRAS HERE

all_dbs, amazon, apache.atlas, apache.beam, apache.cassandra, apache.druid, apache.hdfs,
apache.hive, apache.kylin, apache.livy, apache.pig, apache.pinot, apache.spark, apache.sqoop,
apache.webhdfs, async, atlas, aws, azure, cassandra, celery, cgroups, cloudant, cncf.kubernetes,
crypto, dask, databricks, datadog, dingding, discord, docker, druid, elasticsearch, exasol,
facebook, ftp, gcp, gcp_api, github_enterprise, google, google_auth, grpc, hashicorp, hdfs, hive,
http, imap, jdbc, jenkins, jira, kerberos, kubernetes, ldap, microsoft.azure, microsoft.mssql,
microsoft.winrm, mongo, mssql, mysql, odbc, openfaas, opsgenie, oracle, pagerduty, papermill,
password, pinot, plexus, postgres, presto, qds, qubole, rabbitmq, redis, s3, salesforce, samba,
segment, sendgrid, sentry, sftp, singularity, slack, snowflake, spark, sqlite, ssh, statsd, tableau,
telegram, vertica, virtualenv, webhdfs, winrm, yandex, zendesk, all, devel, devel_hadoop, doc,
devel_all, devel_ci

# END EXTRAS HERE

# For installing Airflow in development environments - see CONTRIBUTING.rst