.. 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. Setting Configuration Options ============================= The first time you run Airflow, it will create a file called ``airflow.cfg`` in your ``$AIRFLOW_HOME`` directory (``~/airflow`` by default). This file contains Airflow's configuration and you can edit it to change any of the settings. You can also set options with environment variables by using this format: ``$AIRFLOW__{SECTION}__{KEY}`` (note the double underscores). For example, the metadata database connection string can either be set in ``airflow.cfg`` like this: .. code-block:: bash [core] sql_alchemy_conn = my_conn_string or by creating a corresponding environment variable: .. code-block:: bash AIRFLOW__CORE__SQL_ALCHEMY_CONN=my_conn_string You can also derive the connection string at run time by appending ``_cmd`` to the key like this: .. code-block:: bash [core] sql_alchemy_conn_cmd = bash_command_to_run The following config options support this ``_cmd`` version: * ``sql_alchemy_conn`` in ``[core]`` section * ``fernet_key`` in ``[core]`` section * ``broker_url`` in ``[celery]`` section * ``result_backend`` in ``[celery]`` section * ``password`` in ``[atlas]`` section * ``smtp_password`` in ``[smtp]`` section * ``bind_password`` in ``[ldap]`` section * ``git_password`` in ``[kubernetes]`` section The idea behind this is to not store passwords on boxes in plain text files. The universal order of precedence for all configuration options is as follows: #. set as an environment variable #. set in ``airflow.cfg`` #. command in ``airflow.cfg`` #. Airflow's built in defaults