Configuration Reference

This page contains the list of all the available Airflow configurations that you can set in airflow.cfg file or using environment variables.

Note

For more information on setting the configuration, see Setting Configuration Options

[core]

dags_folder

The folder where your airflow pipelines live, most likely a subfolder in a code repository. This path must be absolute.

Type

string

Default

{AIRFLOW_HOME}/dags

Environment Variable

AIRFLOW__CORE__DAGS_FOLDER

hostname_callable

Hostname by providing a path to a callable, which will resolve the hostname. The format is “package.function”.

For example, default value “socket.getfqdn” means that result from getfqdn() of “socket” package will be used as hostname.

No argument should be required in the function specified. If using IP address as hostname is preferred, use value airflow.utils.net.get_host_ip_address

Type

string

Default

socket.getfqdn

Environment Variable

AIRFLOW__CORE__HOSTNAME_CALLABLE

default_timezone

Default timezone in case supplied date times are naive can be utc (default), system, or any IANA timezone string (e.g. Europe/Amsterdam)

Type

string

Default

utc

Environment Variable

AIRFLOW__CORE__DEFAULT_TIMEZONE

executor

The executor class that airflow should use. Choices include SequentialExecutor, LocalExecutor, CeleryExecutor, DaskExecutor, KubernetesExecutor, CeleryKubernetesExecutor or the full import path to the class when using a custom executor.

Type

string

Default

SequentialExecutor

Environment Variable

AIRFLOW__CORE__EXECUTOR

sql_alchemy_conn

The SqlAlchemy connection string to the metadata database. SqlAlchemy supports many different database engines. More information here: http://airflow.apache.org/docs/apache-airflow/stable/howto/set-up-database.html#database-uri

Type

string

Default

sqlite:///{AIRFLOW_HOME}/airflow.db

Environment Variables

AIRFLOW__CORE__SQL_ALCHEMY_CONN

AIRFLOW__CORE__SQL_ALCHEMY_CONN_CMD

AIRFLOW__CORE__SQL_ALCHEMY_CONN_SECRET

sql_engine_encoding

New in version 1.10.1.

The encoding for the databases

Type

string

Default

utf-8

Environment Variable

AIRFLOW__CORE__SQL_ENGINE_ENCODING

sql_engine_collation_for_ids

New in version 2.0.0.

Collation for dag_id, task_id, key columns in case they have different encoding. This is particularly useful in case of mysql with utf8mb4 encoding because primary keys for XCom table has too big size and sql_engine_collation_for_ids should be set to utf8mb3_general_ci.

Type

string

Default

None

Environment Variable

AIRFLOW__CORE__SQL_ENGINE_COLLATION_FOR_IDS

sql_alchemy_pool_enabled

If SqlAlchemy should pool database connections.

Type

string

Default

True

Environment Variable

AIRFLOW__CORE__SQL_ALCHEMY_POOL_ENABLED

sql_alchemy_pool_size

The SqlAlchemy pool size is the maximum number of database connections in the pool. 0 indicates no limit.

Type

string

Default

5

Environment Variable

AIRFLOW__CORE__SQL_ALCHEMY_POOL_SIZE

sql_alchemy_max_overflow

New in version 1.10.4.

The maximum overflow size of the pool. When the number of checked-out connections reaches the size set in pool_size, additional connections will be returned up to this limit. When those additional connections are returned to the pool, they are disconnected and discarded. It follows then that the total number of simultaneous connections the pool will allow is pool_size + max_overflow, and the total number of “sleeping” connections the pool will allow is pool_size. max_overflow can be set to -1 to indicate no overflow limit; no limit will be placed on the total number of concurrent connections. Defaults to 10.

Type

string

Default

10

Environment Variable

AIRFLOW__CORE__SQL_ALCHEMY_MAX_OVERFLOW

sql_alchemy_pool_recycle

The SqlAlchemy pool recycle is the number of seconds a connection can be idle in the pool before it is invalidated. This config does not apply to sqlite. If the number of DB connections is ever exceeded, a lower config value will allow the system to recover faster.

Type

string

Default

1800

Environment Variable

AIRFLOW__CORE__SQL_ALCHEMY_POOL_RECYCLE

sql_alchemy_pool_pre_ping

New in version 1.10.6.

Check connection at the start of each connection pool checkout. Typically, this is a simple statement like “SELECT 1”. More information here: https://docs.sqlalchemy.org/en/13/core/pooling.html#disconnect-handling-pessimistic

Type

string

Default

True

Environment Variable

AIRFLOW__CORE__SQL_ALCHEMY_POOL_PRE_PING

sql_alchemy_schema

New in version 1.10.3.

The schema to use for the metadata database. SqlAlchemy supports databases with the concept of multiple schemas.

Type

string

Default

''

Environment Variable

AIRFLOW__CORE__SQL_ALCHEMY_SCHEMA

sql_alchemy_connect_args

New in version 1.10.11.

Import path for connect args in SqlAlchemy. Defaults to an empty dict. This is useful when you want to configure db engine args that SqlAlchemy won’t parse in connection string. See https://docs.sqlalchemy.org/en/13/core/engines.html#sqlalchemy.create_engine.params.connect_args

Type

string

Default

None

Environment Variable

AIRFLOW__CORE__SQL_ALCHEMY_CONNECT_ARGS

parallelism

This defines the maximum number of task instances that can run concurrently in Airflow regardless of scheduler count and worker count. Generally, this value is reflective of the number of task instances with the running state in the metadata database.

Type

string

Default

32

Environment Variable

AIRFLOW__CORE__PARALLELISM

dag_concurrency

The maximum number of task instances allowed to run concurrently in each DAG. To calculate the number of tasks that is running concurrently for a DAG, add up the number of running tasks for all DAG runs of the DAG. This is configurable at the DAG level with concurrency, which is defaulted as dag_concurrency.

Type

string

Default

16

Environment Variable

AIRFLOW__CORE__DAG_CONCURRENCY

dags_are_paused_at_creation

Are DAGs paused by default at creation

Type

string

Default

True

Environment Variable

AIRFLOW__CORE__DAGS_ARE_PAUSED_AT_CREATION

max_active_runs_per_dag

The maximum number of active DAG runs per DAG. The scheduler will not create more DAG runs if it reaches the limit. This is configurable at the DAG level with max_active_runs, which is defaulted as max_active_runs_per_dag.

Type

string

Default

16

Environment Variable

AIRFLOW__CORE__MAX_ACTIVE_RUNS_PER_DAG

load_examples

Whether to load the DAG examples that ship with Airflow. It’s good to get started, but you probably want to set this to False in a production environment

Type

string

Default

True

Environment Variable

AIRFLOW__CORE__LOAD_EXAMPLES

load_default_connections

New in version 1.10.10.

Whether to load the default connections that ship with Airflow. It’s good to get started, but you probably want to set this to False in a production environment

Type

string

Default

True

Environment Variable

AIRFLOW__CORE__LOAD_DEFAULT_CONNECTIONS

plugins_folder

Path to the folder containing Airflow plugins

Type

string

Default

{AIRFLOW_HOME}/plugins

Environment Variable

AIRFLOW__CORE__PLUGINS_FOLDER

execute_tasks_new_python_interpreter

New in version 2.0.0.

Should tasks be executed via forking of the parent process (“False”, the speedier option) or by spawning a new python process (“True” slow, but means plugin changes picked up by tasks straight away)

See also

When are plugins (re)loaded?

Type

boolean

Default

False

Environment Variable

AIRFLOW__CORE__EXECUTE_TASKS_NEW_PYTHON_INTERPRETER

fernet_key

Secret key to save connection passwords in the db

Type

string

Default

{FERNET_KEY}

Environment Variables

AIRFLOW__CORE__FERNET_KEY

AIRFLOW__CORE__FERNET_KEY_CMD

AIRFLOW__CORE__FERNET_KEY_SECRET

donot_pickle

Whether to disable pickling dags

Type

string

Default

True

Environment Variable

AIRFLOW__CORE__DONOT_PICKLE

dagbag_import_timeout

How long before timing out a python file import

Type

float

Default

30.0

Environment Variable

AIRFLOW__CORE__DAGBAG_IMPORT_TIMEOUT

dagbag_import_error_tracebacks

New in version 2.0.0.

Should a traceback be shown in the UI for dagbag import errors, instead of just the exception message

Type

boolean

Default

True

Environment Variable

AIRFLOW__CORE__DAGBAG_IMPORT_ERROR_TRACEBACKS

dagbag_import_error_traceback_depth

New in version 2.0.0.

If tracebacks are shown, how many entries from the traceback should be shown

Type

integer

Default

2

Environment Variable

AIRFLOW__CORE__DAGBAG_IMPORT_ERROR_TRACEBACK_DEPTH

dag_file_processor_timeout

New in version 1.10.6.

How long before timing out a DagFileProcessor, which processes a dag file

Type

string

Default

50

Environment Variable

AIRFLOW__CORE__DAG_FILE_PROCESSOR_TIMEOUT

task_runner

The class to use for running task instances in a subprocess. Choices include StandardTaskRunner, CgroupTaskRunner or the full import path to the class when using a custom task runner.

Type

string

Default

StandardTaskRunner

Environment Variable

AIRFLOW__CORE__TASK_RUNNER

default_impersonation

If set, tasks without a run_as_user argument will be run with this user Can be used to de-elevate a sudo user running Airflow when executing tasks

Type

string

Default

''

Environment Variable

AIRFLOW__CORE__DEFAULT_IMPERSONATION

security

What security module to use (for example kerberos)

Type

string

Default

''

Environment Variable

AIRFLOW__CORE__SECURITY

unit_test_mode

Turn unit test mode on (overwrites many configuration options with test values at runtime)

Type

string

Default

False

Environment Variable

AIRFLOW__CORE__UNIT_TEST_MODE

enable_xcom_pickling

Whether to enable pickling for xcom (note that this is insecure and allows for RCE exploits).

See also

https://docs.python.org/3/library/pickle.html#comparison-with-json

Type

string

Default

False

Environment Variable

AIRFLOW__CORE__ENABLE_XCOM_PICKLING

killed_task_cleanup_time

When a task is killed forcefully, this is the amount of time in seconds that it has to cleanup after it is sent a SIGTERM, before it is SIGKILLED

Type

string

Default

60

Environment Variable

AIRFLOW__CORE__KILLED_TASK_CLEANUP_TIME

dag_run_conf_overrides_params

Whether to override params with dag_run.conf. If you pass some key-value pairs through airflow dags backfill -c or airflow dags trigger -c, the key-value pairs will override the existing ones in params.

Type

string

Default

True

Environment Variable

AIRFLOW__CORE__DAG_RUN_CONF_OVERRIDES_PARAMS

dag_discovery_safe_mode

New in version 1.10.3.

When discovering DAGs, ignore any files that don’t contain the strings DAG and airflow.

Type

string

Default

True

Environment Variable

AIRFLOW__CORE__DAG_DISCOVERY_SAFE_MODE

default_task_retries

New in version 1.10.6.

The number of retries each task is going to have by default. Can be overridden at dag or task level.

Type

string

Default

0

Environment Variable

AIRFLOW__CORE__DEFAULT_TASK_RETRIES

min_serialized_dag_update_interval

New in version 1.10.7.

Updating serialized DAG can not be faster than a minimum interval to reduce database write rate.

Type

string

Default

30

Environment Variable

AIRFLOW__CORE__MIN_SERIALIZED_DAG_UPDATE_INTERVAL

min_serialized_dag_fetch_interval

New in version 1.10.12.

Fetching serialized DAG can not be faster than a minimum interval to reduce database read rate. This config controls when your DAGs are updated in the Webserver

Type

string

Default

10

Environment Variable

AIRFLOW__CORE__MIN_SERIALIZED_DAG_FETCH_INTERVAL

store_dag_code

New in version 1.10.10.

Whether to persist DAG files code in DB. If set to True, Webserver reads file contents from DB instead of trying to access files in a DAG folder. (Default is True)

Type

string

Default

None

Environment Variable

AIRFLOW__CORE__STORE_DAG_CODE

Example

True

max_num_rendered_ti_fields_per_task

New in version 2.0.0.

Maximum number of Rendered Task Instance Fields (Template Fields) per task to store in the Database. All the template_fields for each of Task Instance are stored in the Database. Keeping this number small may cause an error when you try to view Rendered tab in TaskInstance view for older tasks.

Type

integer

Default

30

Environment Variable

AIRFLOW__CORE__MAX_NUM_RENDERED_TI_FIELDS_PER_TASK

check_slas

New in version 1.10.8.

On each dagrun check against defined SLAs

Type

string

Default

True

Environment Variable

AIRFLOW__CORE__CHECK_SLAS

xcom_backend

New in version 1.10.12.

Path to custom XCom class that will be used to store and resolve operators results

Type

string

Default

airflow.models.xcom.BaseXCom

Environment Variable

AIRFLOW__CORE__XCOM_BACKEND

Example

path.to.CustomXCom

lazy_load_plugins

New in version 2.0.0.

By default Airflow plugins are lazily-loaded (only loaded when required). Set it to False, if you want to load plugins whenever ‘airflow’ is invoked via cli or loaded from module.

Type

boolean

Default

True

Environment Variable

AIRFLOW__CORE__LAZY_LOAD_PLUGINS

lazy_discover_providers

New in version 2.0.0.

By default Airflow providers are lazily-discovered (discovery and imports happen only when required). Set it to False, if you want to discover providers whenever ‘airflow’ is invoked via cli or loaded from module.

Type

boolean

Default

True

Environment Variable

AIRFLOW__CORE__LAZY_DISCOVER_PROVIDERS

max_db_retries

Number of times the code should be retried in case of DB Operational Errors. Not all transactions will be retried as it can cause undesired state. Currently it is only used in DagFileProcessor.process_file to retry dagbag.sync_to_db.

Type

integer

Default

3

Environment Variable

AIRFLOW__CORE__MAX_DB_RETRIES

hide_sensitive_var_conn_fields

Hide sensitive Variables or Connection extra json keys from UI and task logs when set to True

(Connection passwords are always hidden in logs)

Type

boolean

Default

True

Environment Variable

AIRFLOW__CORE__HIDE_SENSITIVE_VAR_CONN_FIELDS

sensitive_var_conn_names

A comma-separated list of extra sensitive keywords to look for in variables names or connection’s extra JSON.

Type

string

Default

''

Environment Variable

AIRFLOW__CORE__SENSITIVE_VAR_CONN_NAMES

worker_precheck (Deprecated)

Deprecated since version 2.0.0: The option has been moved to celery.worker_precheck

base_log_folder (Deprecated)

Deprecated since version 2.0.0: The option has been moved to logging.base_log_folder

remote_logging (Deprecated)

Deprecated since version 2.0.0: The option has been moved to logging.remote_logging

remote_log_conn_id (Deprecated)

Deprecated since version 2.0.0: The option has been moved to logging.remote_log_conn_id

remote_base_log_folder (Deprecated)

Deprecated since version 2.0.0: The option has been moved to logging.remote_base_log_folder

encrypt_s3_logs (Deprecated)

Deprecated since version 2.0.0: The option has been moved to logging.encrypt_s3_logs

logging_level (Deprecated)

Deprecated since version 2.0.0: The option has been moved to logging.logging_level

fab_logging_level (Deprecated)

Deprecated since version 2.0.0: The option has been moved to logging.fab_logging_level

logging_config_class (Deprecated)

Deprecated since version 2.0.0: The option has been moved to logging.logging_config_class

colored_console_log (Deprecated)

Deprecated since version 2.0.0: The option has been moved to logging.colored_console_log

colored_log_format (Deprecated)

Deprecated since version 2.0.0: The option has been moved to logging.colored_log_format

colored_formatter_class (Deprecated)

Deprecated since version 2.0.0: The option has been moved to logging.colored_formatter_class

log_format (Deprecated)

Deprecated since version 2.0.0: The option has been moved to logging.log_format

simple_log_format (Deprecated)

Deprecated since version 2.0.0: The option has been moved to logging.simple_log_format

task_log_prefix_template (Deprecated)

Deprecated since version 2.0.0: The option has been moved to logging.task_log_prefix_template

log_filename_template (Deprecated)

Deprecated since version 2.0.0: The option has been moved to logging.log_filename_template

log_processor_filename_template (Deprecated)

Deprecated since version 2.0.0: The option has been moved to logging.log_processor_filename_template

dag_processor_manager_log_location (Deprecated)

Deprecated since version 2.0.0: The option has been moved to logging.dag_processor_manager_log_location

task_log_reader (Deprecated)

Deprecated since version 2.0.0: The option has been moved to logging.task_log_reader

[logging]

base_log_folder

The folder where airflow should store its log files This path must be absolute

Type

string

Default

{AIRFLOW_HOME}/logs

Environment Variable

AIRFLOW__LOGGING__BASE_LOG_FOLDER

remote_logging

Airflow can store logs remotely in AWS S3, Google Cloud Storage or Elastic Search. Set this to True if you want to enable remote logging.

Type

string

Default

False

Environment Variable

AIRFLOW__LOGGING__REMOTE_LOGGING

remote_log_conn_id

Users must supply an Airflow connection id that provides access to the storage location.

Type

string

Default

''

Environment Variable

AIRFLOW__LOGGING__REMOTE_LOG_CONN_ID

google_key_path

Path to Google Credential JSON file. If omitted, authorization based on the Application Default Credentials will be used.

Type

string

Default

''

Environment Variable

AIRFLOW__LOGGING__GOOGLE_KEY_PATH

remote_base_log_folder

Storage bucket URL for remote logging S3 buckets should start with “s3://” Cloudwatch log groups should start with “cloudwatch://” GCS buckets should start with “gs://” WASB buckets should start with “wasb” just to help Airflow select correct handler Stackdriver logs should start with “stackdriver://”

Type

string

Default

''

Environment Variable

AIRFLOW__LOGGING__REMOTE_BASE_LOG_FOLDER

encrypt_s3_logs

Use server-side encryption for logs stored in S3

Type

string

Default

False

Environment Variable

AIRFLOW__LOGGING__ENCRYPT_S3_LOGS

logging_level

Logging level.

Supported values: CRITICAL, ERROR, WARNING, INFO, DEBUG.

Type

string

Default

INFO

Environment Variable

AIRFLOW__LOGGING__LOGGING_LEVEL

fab_logging_level

Logging level for Flask-appbuilder UI.

Supported values: CRITICAL, ERROR, WARNING, INFO, DEBUG.

Type

string

Default

WARN

Environment Variable

AIRFLOW__LOGGING__FAB_LOGGING_LEVEL

logging_config_class

Logging class Specify the class that will specify the logging configuration This class has to be on the python classpath

Type

string

Default

''

Environment Variable

AIRFLOW__LOGGING__LOGGING_CONFIG_CLASS

Example

my.path.default_local_settings.LOGGING_CONFIG

colored_console_log

New in version 1.10.4.

Flag to enable/disable Colored logs in Console Colour the logs when the controlling terminal is a TTY.

Type

string

Default

True

Environment Variable

AIRFLOW__LOGGING__COLORED_CONSOLE_LOG

colored_log_format

New in version 1.10.4.

Log format for when Colored logs is enabled

Type

string

Default

[%%(blue)s%%(asctime)s%%(reset)s] {%%(blue)s%%(filename)s:%%(reset)s%%(lineno)d} %%(log_color)s%%(levelname)s%%(reset)s - %%(log_color)s%%(message)s%%(reset)s

Environment Variable

AIRFLOW__LOGGING__COLORED_LOG_FORMAT

colored_formatter_class

New in version 1.10.4.

Type

string

Default

airflow.utils.log.colored_log.CustomTTYColoredFormatter

Environment Variable

AIRFLOW__LOGGING__COLORED_FORMATTER_CLASS

log_format

Format of Log line

Type

string

Default

[%%(asctime)s] {%%(filename)s:%%(lineno)d} %%(levelname)s - %%(message)s

Environment Variable

AIRFLOW__LOGGING__LOG_FORMAT

simple_log_format

Type

string

Default

%%(asctime)s %%(levelname)s - %%(message)s

Environment Variable

AIRFLOW__LOGGING__SIMPLE_LOG_FORMAT

task_log_prefix_template

Specify prefix pattern like mentioned below with stream handler TaskHandlerWithCustomFormatter

Type

string

Default

''

Environment Variable

AIRFLOW__LOGGING__TASK_LOG_PREFIX_TEMPLATE

Example

{ti.dag_id}-{ti.task_id}-{execution_date}-{try_number}

log_filename_template

Formatting for how airflow generates file names/paths for each task run.

Type

string

Default

{{ ti.dag_id }}/{{ ti.task_id }}/{{ ts }}/{{ try_number }}.log

Environment Variable

AIRFLOW__LOGGING__LOG_FILENAME_TEMPLATE

log_processor_filename_template

Formatting for how airflow generates file names for log

Type

string

Default

{{ filename }}.log

Environment Variable

AIRFLOW__LOGGING__LOG_PROCESSOR_FILENAME_TEMPLATE

dag_processor_manager_log_location

New in version 1.10.2.

full path of dag_processor_manager logfile

Type

string

Default

{AIRFLOW_HOME}/logs/dag_processor_manager/dag_processor_manager.log

Environment Variable

AIRFLOW__LOGGING__DAG_PROCESSOR_MANAGER_LOG_LOCATION

task_log_reader

Name of handler to read task instance logs. Defaults to use task handler.

Type

string

Default

task

Environment Variable

AIRFLOW__LOGGING__TASK_LOG_READER

extra_loggers

A comma-separated list of third-party logger names that will be configured to print messages to consoles.

Type

string

Default

''

Environment Variable

AIRFLOW__LOGGING__EXTRA_LOGGERS

Example

connexion,sqlalchemy

[metrics]

StatsD (https://github.com/etsy/statsd) integration settings.

statsd_on

Enables sending metrics to StatsD.

Type

string

Default

False

Environment Variable

AIRFLOW__METRICS__STATSD_ON

statsd_host

Type

string

Default

localhost

Environment Variable

AIRFLOW__METRICS__STATSD_HOST

statsd_port

Type

string

Default

8125

Environment Variable

AIRFLOW__METRICS__STATSD_PORT

statsd_prefix

Type

string

Default

airflow

Environment Variable

AIRFLOW__METRICS__STATSD_PREFIX

statsd_allow_list

New in version 1.10.6.

If you want to avoid sending all the available metrics to StatsD, you can configure an allow list of prefixes (comma separated) to send only the metrics that start with the elements of the list (e.g: “scheduler,executor,dagrun”)

Type

string

Default

''

Environment Variable

AIRFLOW__METRICS__STATSD_ALLOW_LIST

stat_name_handler

A function that validate the statsd stat name, apply changes to the stat name if necessary and return the transformed stat name.

The function should have the following signature: def func_name(stat_name: str) -> str:

Type

string

Default

''

Environment Variable

AIRFLOW__METRICS__STAT_NAME_HANDLER

statsd_datadog_enabled

To enable datadog integration to send airflow metrics.

Type

string

Default

False

Environment Variable

AIRFLOW__METRICS__STATSD_DATADOG_ENABLED

statsd_datadog_tags

List of datadog tags attached to all metrics(e.g: key1:value1,key2:value2)

Type

string

Default

''

Environment Variable

AIRFLOW__METRICS__STATSD_DATADOG_TAGS

statsd_custom_client_path

If you want to utilise your own custom Statsd client set the relevant module path below. Note: The module path must exist on your PYTHONPATH for Airflow to pick it up

Type

string

Default

None

Environment Variable

AIRFLOW__METRICS__STATSD_CUSTOM_CLIENT_PATH

[secrets]

backend

New in version 1.10.10.

Full class name of secrets backend to enable (will precede env vars and metastore in search path)

Type

string

Default

''

Environment Variable

AIRFLOW__SECRETS__BACKEND

Example

airflow.providers.amazon.aws.secrets.systems_manager.SystemsManagerParameterStoreBackend

backend_kwargs

New in version 1.10.10.

The backend_kwargs param is loaded into a dictionary and passed to __init__ of secrets backend class. See documentation for the secrets backend you are using. JSON is expected. Example for AWS Systems Manager ParameterStore: {{"connections_prefix": "/airflow/connections", "profile_name": "default"}}

Type

string

Default

''

Environment Variable

AIRFLOW__SECRETS__BACKEND_KWARGS

[cli]

api_client

In what way should the cli access the API. The LocalClient will use the database directly, while the json_client will use the api running on the webserver

Type

string

Default

airflow.api.client.local_client

Environment Variable

AIRFLOW__CLI__API_CLIENT

endpoint_url

If you set web_server_url_prefix, do NOT forget to append it here, ex: endpoint_url = http://localhost:8080/myroot So api will look like: http://localhost:8080/myroot/api/experimental/...

Type

string

Default

http://localhost:8080

Environment Variable

AIRFLOW__CLI__ENDPOINT_URL

[debug]

fail_fast

New in version 1.10.8.

Used only with DebugExecutor. If set to True DAG will fail with first failed task. Helpful for debugging purposes.

Type

string

Default

False

Environment Variable

AIRFLOW__DEBUG__FAIL_FAST

[api]

enable_experimental_api

New in version 2.0.0.

Enables the deprecated experimental API. Please note that these APIs do not have access control. The authenticated user has full access.

Warning

This Experimental REST API is deprecated since version 2.0. Please consider using the Stable REST API. For more information on migration, see UPDATING.md

Type

boolean

Default

False

Environment Variable

AIRFLOW__API__ENABLE_EXPERIMENTAL_API

auth_backend

How to authenticate users of the API. See https://airflow.apache.org/docs/apache-airflow/stable/security.html for possible values. (“airflow.api.auth.backend.default” allows all requests for historic reasons)

Type

string

Default

airflow.api.auth.backend.deny_all

Environment Variable

AIRFLOW__API__AUTH_BACKEND

maximum_page_limit

Used to set the maximum page limit for API requests

Type

integer

Default

100

Environment Variable

AIRFLOW__API__MAXIMUM_PAGE_LIMIT

fallback_page_limit

Used to set the default page limit when limit is zero. A default limit of 100 is set on OpenApi spec. However, this particular default limit only work when limit is set equal to zero(0) from API requests. If no limit is supplied, the OpenApi spec default is used.

Type

integer

Default

100

Environment Variable

AIRFLOW__API__FALLBACK_PAGE_LIMIT

google_oauth2_audience

The intended audience for JWT token credentials used for authorization. This value must match on the client and server sides. If empty, audience will not be tested.

Type

string

Default

''

Environment Variable

AIRFLOW__API__GOOGLE_OAUTH2_AUDIENCE

Example

project-id-random-value.apps.googleusercontent.com

google_key_path

Path to Google Cloud Service Account key file (JSON). If omitted, authorization based on the Application Default Credentials will be used.

Type

string

Default

''

Environment Variable

AIRFLOW__API__GOOGLE_KEY_PATH

Example

/files/service-account-json

access_control_allow_headers

Used in response to a preflight request to indicate which HTTP headers can be used when making the actual request. This header is the server side response to the browser’s Access-Control-Request-Headers header.

Type

string

Default

''

Environment Variable

AIRFLOW__API__ACCESS_CONTROL_ALLOW_HEADERS

access_control_allow_methods

Specifies the method or methods allowed when accessing the resource.

Type

string

Default

''

Environment Variable

AIRFLOW__API__ACCESS_CONTROL_ALLOW_METHODS

access_control_allow_origin

Indicates whether the response can be shared with requesting code from the given origin.

Type

string

Default

''

Environment Variable

AIRFLOW__API__ACCESS_CONTROL_ALLOW_ORIGIN

[lineage]

backend

what lineage backend to use

Type

string

Default

''

Environment Variable

AIRFLOW__LINEAGE__BACKEND

[atlas]

sasl_enabled

Type

string

Default

False

Environment Variable

AIRFLOW__ATLAS__SASL_ENABLED

host

Type

string

Default

''

Environment Variable

AIRFLOW__ATLAS__HOST

port

Type

string

Default

21000

Environment Variable

AIRFLOW__ATLAS__PORT

username

Type

string

Default

''

Environment Variable

AIRFLOW__ATLAS__USERNAME

password

Type

string

Default

''

Environment Variables

AIRFLOW__ATLAS__PASSWORD

AIRFLOW__ATLAS__PASSWORD_CMD

AIRFLOW__ATLAS__PASSWORD_SECRET

[operators]

default_owner

The default owner assigned to each new operator, unless provided explicitly or passed via default_args

Type

string

Default

airflow

Environment Variable

AIRFLOW__OPERATORS__DEFAULT_OWNER

default_cpus

Type

string

Default

1

Environment Variable

AIRFLOW__OPERATORS__DEFAULT_CPUS

default_ram

Type

string

Default

512

Environment Variable

AIRFLOW__OPERATORS__DEFAULT_RAM

default_disk

Type

string

Default

512

Environment Variable

AIRFLOW__OPERATORS__DEFAULT_DISK

default_gpus

Type

string

Default

0

Environment Variable

AIRFLOW__OPERATORS__DEFAULT_GPUS

default_queue

Default queue that tasks get assigned to and that worker listen on.

Type

string

Default

default

Environment Variable

AIRFLOW__OPERATORS__DEFAULT_QUEUE

allow_illegal_arguments

Is allowed to pass additional/unused arguments (args, kwargs) to the BaseOperator operator. If set to False, an exception will be thrown, otherwise only the console message will be displayed.

Type

string

Default

False

Environment Variable

AIRFLOW__OPERATORS__ALLOW_ILLEGAL_ARGUMENTS

[hive]

default_hive_mapred_queue

Default mapreduce queue for HiveOperator tasks

Type

string

Default

''

Environment Variable

AIRFLOW__HIVE__DEFAULT_HIVE_MAPRED_QUEUE

mapred_job_name_template

Template for mapred_job_name in HiveOperator, supports the following named parameters hostname, dag_id, task_id, execution_date

Type

string

Default

None

Environment Variable

AIRFLOW__HIVE__MAPRED_JOB_NAME_TEMPLATE

[webserver]

base_url

The base url of your website as airflow cannot guess what domain or cname you are using. This is used in automated emails that airflow sends to point links to the right web server

Type

string

Default

http://localhost:8080

Environment Variable

AIRFLOW__WEBSERVER__BASE_URL

default_ui_timezone

New in version 1.10.10.

Default timezone to display all dates in the UI, can be UTC, system, or any IANA timezone string (e.g. Europe/Amsterdam). If left empty the default value of core/default_timezone will be used

Type

string

Default

UTC

Environment Variable

AIRFLOW__WEBSERVER__DEFAULT_UI_TIMEZONE

Example

America/New_York

web_server_host

The ip specified when starting the web server

Type

string

Default

0.0.0.0

Environment Variable

AIRFLOW__WEBSERVER__WEB_SERVER_HOST

web_server_port

The port on which to run the web server

Type

string

Default

8080

Environment Variable

AIRFLOW__WEBSERVER__WEB_SERVER_PORT

web_server_ssl_cert

Paths to the SSL certificate and key for the web server. When both are provided SSL will be enabled. This does not change the web server port.

Type

string

Default

''

Environment Variable

AIRFLOW__WEBSERVER__WEB_SERVER_SSL_CERT

web_server_ssl_key

Paths to the SSL certificate and key for the web server. When both are provided SSL will be enabled. This does not change the web server port.

Type

string

Default

''

Environment Variable

AIRFLOW__WEBSERVER__WEB_SERVER_SSL_KEY

web_server_master_timeout

Number of seconds the webserver waits before killing gunicorn master that doesn’t respond

Type

string

Default

120

Environment Variable

AIRFLOW__WEBSERVER__WEB_SERVER_MASTER_TIMEOUT

web_server_worker_timeout

Number of seconds the gunicorn webserver waits before timing out on a worker

Type

string

Default

120

Environment Variable

AIRFLOW__WEBSERVER__WEB_SERVER_WORKER_TIMEOUT

worker_refresh_batch_size

Number of workers to refresh at a time. When set to 0, worker refresh is disabled. When nonzero, airflow periodically refreshes webserver workers by bringing up new ones and killing old ones.

Type

string

Default

1

Environment Variable

AIRFLOW__WEBSERVER__WORKER_REFRESH_BATCH_SIZE

worker_refresh_interval

Number of seconds to wait before refreshing a batch of workers.

Type

string

Default

6000

Environment Variable

AIRFLOW__WEBSERVER__WORKER_REFRESH_INTERVAL

reload_on_plugin_change

New in version 1.10.11.

If set to True, Airflow will track files in plugins_folder directory. When it detects changes, then reload the gunicorn.

Type

boolean

Default

False

Environment Variable

AIRFLOW__WEBSERVER__RELOAD_ON_PLUGIN_CHANGE

secret_key

Secret key used to run your flask app. It should be as random as possible. However, when running more than 1 instances of webserver, make sure all of them use the same secret_key otherwise one of them will error with “CSRF session token is missing”.

Type

string

Default

{SECRET_KEY}

Environment Variables

AIRFLOW__WEBSERVER__SECRET_KEY

AIRFLOW__WEBSERVER__SECRET_KEY_CMD

AIRFLOW__WEBSERVER__SECRET_KEY_SECRET

workers

Number of workers to run the Gunicorn web server

Type

string

Default

4

Environment Variable

AIRFLOW__WEBSERVER__WORKERS

worker_class

The worker class gunicorn should use. Choices include sync (default), eventlet, gevent

Type

string

Default

sync

Environment Variable

AIRFLOW__WEBSERVER__WORKER_CLASS

access_logfile

Log files for the gunicorn webserver. ‘-‘ means log to stderr.

Type

string

Default

-

Environment Variable

AIRFLOW__WEBSERVER__ACCESS_LOGFILE

error_logfile

Log files for the gunicorn webserver. ‘-‘ means log to stderr.

Type

string

Default

-

Environment Variable

AIRFLOW__WEBSERVER__ERROR_LOGFILE

access_logformat

Access log format for gunicorn webserver. default format is %%(h)s %%(l)s %%(u)s %%(t)s “%%(r)s” %%(s)s %%(b)s “%%(f)s” “%%(a)s” documentation - https://docs.gunicorn.org/en/stable/settings.html#access-log-format

Type

string

Default

''

Environment Variable

AIRFLOW__WEBSERVER__ACCESS_LOGFORMAT

expose_config

Expose the configuration file in the web server

Type

string

Default

False

Environment Variable

AIRFLOW__WEBSERVER__EXPOSE_CONFIG

expose_hostname

New in version 1.10.8.

Expose hostname in the web server

Type

string

Default

True

Environment Variable

AIRFLOW__WEBSERVER__EXPOSE_HOSTNAME

expose_stacktrace

New in version 1.10.8.

Expose stacktrace in the web server

Type

string

Default

True

Environment Variable

AIRFLOW__WEBSERVER__EXPOSE_STACKTRACE

dag_default_view

Default DAG view. Valid values are: tree, graph, duration, gantt, landing_times

Type

string

Default

tree

Environment Variable

AIRFLOW__WEBSERVER__DAG_DEFAULT_VIEW

dag_orientation

Default DAG orientation. Valid values are: LR (Left->Right), TB (Top->Bottom), RL (Right->Left), BT (Bottom->Top)

Type

string

Default

LR

Environment Variable

AIRFLOW__WEBSERVER__DAG_ORIENTATION

log_fetch_timeout_sec

The amount of time (in secs) webserver will wait for initial handshake while fetching logs from other worker machine

Type

string

Default

5

Environment Variable

AIRFLOW__WEBSERVER__LOG_FETCH_TIMEOUT_SEC

log_fetch_delay_sec

New in version 1.10.8.

Time interval (in secs) to wait before next log fetching.

Type

integer

Default

2

Environment Variable

AIRFLOW__WEBSERVER__LOG_FETCH_DELAY_SEC

log_auto_tailing_offset

New in version 1.10.8.

Distance away from page bottom to enable auto tailing.

Type

integer

Default

30

Environment Variable

AIRFLOW__WEBSERVER__LOG_AUTO_TAILING_OFFSET

log_animation_speed

New in version 1.10.8.

Animation speed for auto tailing log display.

Type

integer

Default

1000

Environment Variable

AIRFLOW__WEBSERVER__LOG_ANIMATION_SPEED

hide_paused_dags_by_default

By default, the webserver shows paused DAGs. Flip this to hide paused DAGs by default

Type

string

Default

False

Environment Variable

AIRFLOW__WEBSERVER__HIDE_PAUSED_DAGS_BY_DEFAULT

page_size

Consistent page size across all listing views in the UI

Type

string

Default

100

Environment Variable

AIRFLOW__WEBSERVER__PAGE_SIZE

default_dag_run_display_number

Default dagrun to show in UI

Type

string

Default

25

Environment Variable

AIRFLOW__WEBSERVER__DEFAULT_DAG_RUN_DISPLAY_NUMBER

enable_proxy_fix

New in version 1.10.1.

Enable werkzeug ProxyFix middleware for reverse proxy

Type

boolean

Default

False

Environment Variable

AIRFLOW__WEBSERVER__ENABLE_PROXY_FIX

proxy_fix_x_for

New in version 1.10.7.

Number of values to trust for X-Forwarded-For. More info: https://werkzeug.palletsprojects.com/en/0.16.x/middleware/proxy_fix/

Type

integer

Default

1

Environment Variable

AIRFLOW__WEBSERVER__PROXY_FIX_X_FOR

proxy_fix_x_proto

New in version 1.10.7.

Number of values to trust for X-Forwarded-Proto

Type

integer

Default

1

Environment Variable

AIRFLOW__WEBSERVER__PROXY_FIX_X_PROTO

proxy_fix_x_host

New in version 1.10.7.

Number of values to trust for X-Forwarded-Host

Type

integer

Default

1

Environment Variable

AIRFLOW__WEBSERVER__PROXY_FIX_X_HOST

proxy_fix_x_port

New in version 1.10.7.

Number of values to trust for X-Forwarded-Port

Type

integer

Default

1

Environment Variable

AIRFLOW__WEBSERVER__PROXY_FIX_X_PORT

proxy_fix_x_prefix

New in version 1.10.7.

Number of values to trust for X-Forwarded-Prefix

Type

integer

Default

1

Environment Variable

AIRFLOW__WEBSERVER__PROXY_FIX_X_PREFIX

default_wrap

New in version 1.10.4.

Default setting for wrap toggle on DAG code and TI log views.

Type

boolean

Default

False

Environment Variable

AIRFLOW__WEBSERVER__DEFAULT_WRAP

x_frame_enabled

New in version 1.10.8.

Allow the UI to be rendered in a frame

Type

boolean

Default

True

Environment Variable

AIRFLOW__WEBSERVER__X_FRAME_ENABLED

analytics_tool

Send anonymous user activity to your analytics tool choose from google_analytics, segment, or metarouter

Type

string

Default

None

Environment Variable

AIRFLOW__WEBSERVER__ANALYTICS_TOOL

analytics_id

New in version 1.10.5.

Unique ID of your account in the analytics tool

Type

string

Default

None

Environment Variable

AIRFLOW__WEBSERVER__ANALYTICS_ID

show_recent_stats_for_completed_runs

‘Recent Tasks’ stats will show for old DagRuns if set

Type

boolean

Default

True

Environment Variable

AIRFLOW__WEBSERVER__SHOW_RECENT_STATS_FOR_COMPLETED_RUNS

update_fab_perms

New in version 1.10.7.

Update FAB permissions and sync security manager roles on webserver startup

Type

string

Default

True

Environment Variable

AIRFLOW__WEBSERVER__UPDATE_FAB_PERMS

session_lifetime_minutes

New in version 1.10.13.

The UI cookie lifetime in minutes. User will be logged out from UI after session_lifetime_minutes of non-activity

Type

integer

Default

43200

Environment Variable

AIRFLOW__WEBSERVER__SESSION_LIFETIME_MINUTES

instance_name

New in version 2.1.0.

Sets a custom page title for the DAGs overview page and site title for all pages

Type

string

Default

None

Environment Variable

AIRFLOW__WEBSERVER__INSTANCE_NAME

[email]

Configuration email backend and whether to send email alerts on retry or failure

email_backend

Email backend to use

Type

string

Default

airflow.utils.email.send_email_smtp

Environment Variable

AIRFLOW__EMAIL__EMAIL_BACKEND

email_conn_id

Email connection to use

Type

string

Default

smtp_default

Environment Variable

AIRFLOW__EMAIL__EMAIL_CONN_ID

default_email_on_retry

Whether email alerts should be sent when a task is retried

Type

boolean

Default

True

Environment Variable

AIRFLOW__EMAIL__DEFAULT_EMAIL_ON_RETRY

default_email_on_failure

Whether email alerts should be sent when a task failed

Type

boolean

Default

True

Environment Variable

AIRFLOW__EMAIL__DEFAULT_EMAIL_ON_FAILURE

subject_template

File that will be used as the template for Email subject (which will be rendered using Jinja2). If not set, Airflow uses a base template.

See also

Email Configuration

Type

string

Default

None

Environment Variable

AIRFLOW__EMAIL__SUBJECT_TEMPLATE

Example

/path/to/my_subject_template_file

html_content_template

File that will be used as the template for Email content (which will be rendered using Jinja2). If not set, Airflow uses a base template.

See also

Email Configuration

Type

string

Default

None

Environment Variable

AIRFLOW__EMAIL__HTML_CONTENT_TEMPLATE

Example

/path/to/my_html_content_template_file

[smtp]

If you want airflow to send emails on retries, failure, and you want to use the airflow.utils.email.send_email_smtp function, you have to configure an smtp server here

smtp_host

Type

string

Default

localhost

Environment Variable

AIRFLOW__SMTP__SMTP_HOST

smtp_starttls

Type

string

Default

True

Environment Variable

AIRFLOW__SMTP__SMTP_STARTTLS

smtp_ssl

Type

string

Default

False

Environment Variable

AIRFLOW__SMTP__SMTP_SSL

smtp_user

Type

string

Default

None

Environment Variable

AIRFLOW__SMTP__SMTP_USER

Example

airflow

smtp_password

Type

string

Default

None

Environment Variables

AIRFLOW__SMTP__SMTP_PASSWORD

AIRFLOW__SMTP__SMTP_PASSWORD_CMD

AIRFLOW__SMTP__SMTP_PASSWORD_SECRET

Example

airflow

smtp_port

Type

string

Default

25

Environment Variable

AIRFLOW__SMTP__SMTP_PORT

smtp_mail_from

Type

string

Default

airflow@example.com

Environment Variable

AIRFLOW__SMTP__SMTP_MAIL_FROM

smtp_timeout

Type

integer

Default

30

Environment Variable

AIRFLOW__SMTP__SMTP_TIMEOUT

smtp_retry_limit

Type

integer

Default

5

Environment Variable

AIRFLOW__SMTP__SMTP_RETRY_LIMIT

[sentry]

Sentry (https://docs.sentry.io) integration. Here you can supply additional configuration options based on the Python platform. See: https://docs.sentry.io/error-reporting/configuration/?platform=python. Unsupported options: integrations, in_app_include, in_app_exclude, ignore_errors, before_breadcrumb, before_send, transport.

sentry_on

Enable error reporting to Sentry

Type

string

Default

false

Environment Variable

AIRFLOW__SENTRY__SENTRY_ON

sentry_dsn

New in version 1.10.6.

Type

string

Default

''

Environment Variable

AIRFLOW__SENTRY__SENTRY_DSN

[celery_kubernetes_executor]

This section only applies if you are using the CeleryKubernetesExecutor in [core] section above

kubernetes_queue

New in version 2.0.0.

Define when to send a task to KubernetesExecutor when using CeleryKubernetesExecutor. When the queue of a task is the value of kubernetes_queue (default kubernetes), the task is executed via KubernetesExecutor, otherwise via CeleryExecutor

Type

string

Default

kubernetes

Environment Variable

AIRFLOW__CELERY_KUBERNETES_EXECUTOR__KUBERNETES_QUEUE

[celery]

This section only applies if you are using the CeleryExecutor in [core] section above

celery_app_name

The app name that will be used by celery

Type

string

Default

airflow.executors.celery_executor

Environment Variable

AIRFLOW__CELERY__CELERY_APP_NAME

worker_concurrency

The concurrency that will be used when starting workers with the airflow celery worker command. This defines the number of task instances that a worker will take, so size up your workers based on the resources on your worker box and the nature of your tasks

Type

string

Default

16

Environment Variable

AIRFLOW__CELERY__WORKER_CONCURRENCY

worker_autoscale

The maximum and minimum concurrency that will be used when starting workers with the airflow celery worker command (always keep minimum processes, but grow to maximum if necessary). Note the value should be max_concurrency,min_concurrency Pick these numbers based on resources on worker box and the nature of the task. If autoscale option is available, worker_concurrency will be ignored. http://docs.celeryproject.org/en/latest/reference/celery.bin.worker.html#cmdoption-celery-worker-autoscale

Type

string

Default

None

Environment Variable

AIRFLOW__CELERY__WORKER_AUTOSCALE

Example

16,12

worker_prefetch_multiplier

Used to increase the number of tasks that a worker prefetches which can improve performance. The number of processes multiplied by worker_prefetch_multiplier is the number of tasks that are prefetched by a worker. A value greater than 1 can result in tasks being unnecessarily blocked if there are multiple workers and one worker prefetches tasks that sit behind long running tasks while another worker has unutilized processes that are unable to process the already claimed blocked tasks. https://docs.celeryproject.org/en/stable/userguide/optimizing.html#prefetch-limits

Type

integer

Default

None

Environment Variable

AIRFLOW__CELERY__WORKER_PREFETCH_MULTIPLIER

Example

1

worker_log_server_port

When you start an airflow worker, airflow starts a tiny web server subprocess to serve the workers local log files to the airflow main web server, who then builds pages and sends them to users. This defines the port on which the logs are served. It needs to be unused, and open visible from the main web server to connect into the workers.

Type

string

Default

8793

Environment Variable

AIRFLOW__CELERY__WORKER_LOG_SERVER_PORT

worker_umask

Umask that will be used when starting workers with the airflow celery worker in daemon mode. This control the file-creation mode mask which determines the initial value of file permission bits for newly created files.

Type

string

Default

0o077

Environment Variable

AIRFLOW__CELERY__WORKER_UMASK

broker_url

The Celery broker URL. Celery supports RabbitMQ, Redis and experimentally a sqlalchemy database. Refer to the Celery documentation for more information.

Type

string

Default

redis://redis:6379/0

Environment Variables

AIRFLOW__CELERY__BROKER_URL

AIRFLOW__CELERY__BROKER_URL_CMD

AIRFLOW__CELERY__BROKER_URL_SECRET

result_backend

The Celery result_backend. When a job finishes, it needs to update the metadata of the job. Therefore it will post a message on a message bus, or insert it into a database (depending of the backend) This status is used by the scheduler to update the state of the task The use of a database is highly recommended http://docs.celeryproject.org/en/latest/userguide/configuration.html#task-result-backend-settings

Type

string

Default

db+postgresql://postgres:airflow@postgres/airflow

Environment Variables

AIRFLOW__CELERY__RESULT_BACKEND

AIRFLOW__CELERY__RESULT_BACKEND_CMD

AIRFLOW__CELERY__RESULT_BACKEND_SECRET

flower_host

Celery Flower is a sweet UI for Celery. Airflow has a shortcut to start it airflow celery flower. This defines the IP that Celery Flower runs on

Type

string

Default

0.0.0.0

Environment Variable

AIRFLOW__CELERY__FLOWER_HOST

flower_url_prefix

The root URL for Flower

Type

string

Default

''

Environment Variable

AIRFLOW__CELERY__FLOWER_URL_PREFIX

Example

/flower

flower_port

This defines the port that Celery Flower runs on

Type

string

Default

5555

Environment Variable

AIRFLOW__CELERY__FLOWER_PORT

flower_basic_auth

New in version 1.10.2.

Securing Flower with Basic Authentication Accepts user:password pairs separated by a comma

Type

string

Default

''

Environment Variables

AIRFLOW__CELERY__FLOWER_BASIC_AUTH

AIRFLOW__CELERY__FLOWER_BASIC_AUTH_CMD

AIRFLOW__CELERY__FLOWER_BASIC_AUTH_SECRET

Example

user1:password1,user2:password2

sync_parallelism

New in version 1.10.3.

How many processes CeleryExecutor uses to sync task state. 0 means to use max(1, number of cores - 1) processes.

Type

string

Default

0

Environment Variable

AIRFLOW__CELERY__SYNC_PARALLELISM

celery_config_options

Import path for celery configuration options

Type

string

Default

airflow.config_templates.default_celery.DEFAULT_CELERY_CONFIG

Environment Variable

AIRFLOW__CELERY__CELERY_CONFIG_OPTIONS

ssl_active

Type

string

Default

False

Environment Variable

AIRFLOW__CELERY__SSL_ACTIVE

ssl_key

Type

string

Default

''

Environment Variable

AIRFLOW__CELERY__SSL_KEY

ssl_cert

Type

string

Default

''

Environment Variable

AIRFLOW__CELERY__SSL_CERT

ssl_cacert

Type

string

Default

''

Environment Variable

AIRFLOW__CELERY__SSL_CACERT

pool

New in version 1.10.4.

Celery Pool implementation. Choices include: prefork (default), eventlet, gevent or solo. See: https://docs.celeryproject.org/en/latest/userguide/workers.html#concurrency https://docs.celeryproject.org/en/latest/userguide/concurrency/eventlet.html

Type

string

Default

prefork

Environment Variable

AIRFLOW__CELERY__POOL

operation_timeout

New in version 1.10.8.

The number of seconds to wait before timing out send_task_to_executor or fetch_celery_task_state operations.

Type

float

Default

1.0

Environment Variable

AIRFLOW__CELERY__OPERATION_TIMEOUT

task_track_started

New in version 2.0.0.

Celery task will report its status as ‘started’ when the task is executed by a worker. This is used in Airflow to keep track of the running tasks and if a Scheduler is restarted or run in HA mode, it can adopt the orphan tasks launched by previous SchedulerJob.

Type

boolean

Default

True

Environment Variable

AIRFLOW__CELERY__TASK_TRACK_STARTED

task_adoption_timeout

New in version 2.0.0.

Time in seconds after which Adopted tasks are cleared by CeleryExecutor. This is helpful to clear stalled tasks.

Type

integer

Default

600

Environment Variable

AIRFLOW__CELERY__TASK_ADOPTION_TIMEOUT

task_publish_max_retries

New in version 2.0.0.

The Maximum number of retries for publishing task messages to the broker when failing due to AirflowTaskTimeout error before giving up and marking Task as failed.

Type

integer

Default

3

Environment Variable

AIRFLOW__CELERY__TASK_PUBLISH_MAX_RETRIES

worker_precheck

New in version 1.10.1.

Worker initialisation check to validate Metadata Database connection

Type

string

Default

False

Environment Variable

AIRFLOW__CELERY__WORKER_PRECHECK

default_queue (Deprecated)

Deprecated since version 2.1.0: The option has been moved to operators.default_queue

[celery_broker_transport_options]

This section is for specifying options which can be passed to the underlying celery broker transport. See: http://docs.celeryproject.org/en/latest/userguide/configuration.html#std:setting-broker_transport_options

visibility_timeout

The visibility timeout defines the number of seconds to wait for the worker to acknowledge the task before the message is redelivered to another worker. Make sure to increase the visibility timeout to match the time of the longest ETA you’re planning to use. visibility_timeout is only supported for Redis and SQS celery brokers. See: http://docs.celeryproject.org/en/master/userguide/configuration.html#std:setting-broker_transport_options

Type

string

Default

None

Environment Variable

AIRFLOW__CELERY_BROKER_TRANSPORT_OPTIONS__VISIBILITY_TIMEOUT

Example

21600

[dask]

This section only applies if you are using the DaskExecutor in [core] section above

cluster_address

The IP address and port of the Dask cluster’s scheduler.

Type

string

Default

127.0.0.1:8786

Environment Variable

AIRFLOW__DASK__CLUSTER_ADDRESS

tls_ca

TLS/ SSL settings to access a secured Dask scheduler.

Type

string

Default

''

Environment Variable

AIRFLOW__DASK__TLS_CA

tls_cert

Type

string

Default

''

Environment Variable

AIRFLOW__DASK__TLS_CERT

tls_key

Type

string

Default

''

Environment Variable

AIRFLOW__DASK__TLS_KEY

[scheduler]

job_heartbeat_sec

Task instances listen for external kill signal (when you clear tasks from the CLI or the UI), this defines the frequency at which they should listen (in seconds).

Type

string

Default

5

Environment Variable

AIRFLOW__SCHEDULER__JOB_HEARTBEAT_SEC

clean_tis_without_dagrun_interval

New in version 2.0.0.

How often (in seconds) to check and tidy up ‘running’ TaskInstancess that no longer have a matching DagRun

Type

float

Default

15.0

Environment Variable

AIRFLOW__SCHEDULER__CLEAN_TIS_WITHOUT_DAGRUN_INTERVAL

scheduler_heartbeat_sec

The scheduler constantly tries to trigger new tasks (look at the scheduler section in the docs for more information). This defines how often the scheduler should run (in seconds).

Type

string

Default

5

Environment Variable

AIRFLOW__SCHEDULER__SCHEDULER_HEARTBEAT_SEC

num_runs

New in version 1.10.6.

The number of times to try to schedule each DAG file -1 indicates unlimited number

Type

string

Default

-1

Environment Variable

AIRFLOW__SCHEDULER__NUM_RUNS

processor_poll_interval

New in version 1.10.6.

The number of seconds to wait between consecutive DAG file processing

Type

string

Default

1

Environment Variable

AIRFLOW__SCHEDULER__PROCESSOR_POLL_INTERVAL

min_file_process_interval

Number of seconds after which a DAG file is parsed. The DAG file is parsed every min_file_process_interval number of seconds. Updates to DAGs are reflected after this interval. Keeping this number low will increase CPU usage.

Type

string

Default

30

Environment Variable

AIRFLOW__SCHEDULER__MIN_FILE_PROCESS_INTERVAL

dag_dir_list_interval

How often (in seconds) to scan the DAGs directory for new files. Default to 5 minutes.

Type

string

Default

300

Environment Variable

AIRFLOW__SCHEDULER__DAG_DIR_LIST_INTERVAL

pool_metrics_interval

New in version 2.0.0.

How often (in seconds) should pool usage stats be sent to statsd (if statsd_on is enabled)

Type

float

Default

5.0

Environment Variable

AIRFLOW__SCHEDULER__POOL_METRICS_INTERVAL

scheduler_health_check_threshold

New in version 1.10.2.

If the last scheduler heartbeat happened more than scheduler_health_check_threshold ago (in seconds), scheduler is considered unhealthy. This is used by the health check in the “/health” endpoint

Type

string

Default

30

Environment Variable

AIRFLOW__SCHEDULER__SCHEDULER_HEALTH_CHECK_THRESHOLD

orphaned_tasks_check_interval

New in version 2.0.0.

How often (in seconds) should the scheduler check for orphaned tasks and SchedulerJobs

Type

float

Default

300.0

Environment Variable

AIRFLOW__SCHEDULER__ORPHANED_TASKS_CHECK_INTERVAL

child_process_log_directory

Type

string

Default

{AIRFLOW_HOME}/logs/scheduler

Environment Variable

AIRFLOW__SCHEDULER__CHILD_PROCESS_LOG_DIRECTORY

scheduler_zombie_task_threshold

Local task jobs periodically heartbeat to the DB. If the job has not heartbeat in this many seconds, the scheduler will mark the associated task instance as failed and will re-schedule the task.

Type

string

Default

300

Environment Variable

AIRFLOW__SCHEDULER__SCHEDULER_ZOMBIE_TASK_THRESHOLD

catchup_by_default

Turn off scheduler catchup by setting this to False. Default behavior is unchanged and Command Line Backfills still work, but the scheduler will not do scheduler catchup if this is False, however it can be set on a per DAG basis in the DAG definition (catchup)

Type

string

Default

True

Environment Variable

AIRFLOW__SCHEDULER__CATCHUP_BY_DEFAULT

max_tis_per_query

This changes the batch size of queries in the scheduling main loop. If this is too high, SQL query performance may be impacted by one or more of the following: - reversion to full table scan - complexity of query predicate - excessive locking Additionally, you may hit the maximum allowable query length for your db. Set this to 0 for no limit (not advised)

Type

string

Default

512

Environment Variable

AIRFLOW__SCHEDULER__MAX_TIS_PER_QUERY

use_row_level_locking

New in version 2.0.0.

Should the scheduler issue SELECT ... FOR UPDATE in relevant queries. If this is set to False then you should not run more than a single scheduler at once

Type

boolean

Default

True

Environment Variable

AIRFLOW__SCHEDULER__USE_ROW_LEVEL_LOCKING

max_dagruns_to_create_per_loop

New in version 2.0.0.

Max number of DAGs to create DagRuns for per scheduler loop

Default: 10

See also

Scheduler Tuneables

Type

string

Default

None

Environment Variable

AIRFLOW__SCHEDULER__MAX_DAGRUNS_TO_CREATE_PER_LOOP

max_dagruns_per_loop_to_schedule

New in version 2.0.0.

How many DagRuns should a scheduler examine (and lock) when scheduling and queuing tasks.

Default: 20

See also

Scheduler Tuneables

Type

string

Default

None

Environment Variable

AIRFLOW__SCHEDULER__MAX_DAGRUNS_PER_LOOP_TO_SCHEDULE

schedule_after_task_execution

New in version 2.0.0.

Should the Task supervisor process perform a “mini scheduler” to attempt to schedule more tasks of the same DAG. Leaving this on will mean tasks in the same DAG execute quicker, but might starve out other dags in some circumstances

Default: True

Type

boolean

Default

None

Environment Variable

AIRFLOW__SCHEDULER__SCHEDULE_AFTER_TASK_EXECUTION

parsing_processes

New in version 1.10.14.

The scheduler can run multiple processes in parallel to parse dags. This defines how many processes will run.

Type

string

Default

2

Environment Variable

AIRFLOW__SCHEDULER__PARSING_PROCESSES

file_parsing_sort_mode

New in version 2.1.0.

One of modified_time, random_seeded_by_host and alphabetical. The scheduler will list and sort the dag files to decide the parsing order.

  • modified_time: Sort by modified time of the files. This is useful on large scale to parse the recently modified DAGs first.

  • random_seeded_by_host: Sort randomly across multiple Schedulers but with same order on the same host. This is useful when running with Scheduler in HA mode where each scheduler can parse different DAG files.

  • alphabetical: Sort by filename

Type

string

Default

modified_time

Environment Variable

AIRFLOW__SCHEDULER__FILE_PARSING_SORT_MODE

use_job_schedule

New in version 1.10.2.

Turn off scheduler use of cron intervals by setting this to False. DAGs submitted manually in the web UI or with trigger_dag will still run.

Type

string

Default

True

Environment Variable

AIRFLOW__SCHEDULER__USE_JOB_SCHEDULE

allow_trigger_in_future

New in version 1.10.8.

Allow externally triggered DagRuns for Execution Dates in the future Only has effect if schedule_interval is set to None in DAG

Type

string

Default

False

Environment Variable

AIRFLOW__SCHEDULER__ALLOW_TRIGGER_IN_FUTURE

dependency_detector

DAG dependency detector class to use

Type

string

Default

airflow.serialization.serialized_objects.DependencyDetector

Environment Variable

AIRFLOW__SCHEDULER__DEPENDENCY_DETECTOR

statsd_on (Deprecated)

Deprecated since version 2.0.0: The option has been moved to metrics.statsd_on

statsd_host (Deprecated)

Deprecated since version 2.0.0: The option has been moved to metrics.statsd_host

statsd_port (Deprecated)

Deprecated since version 2.0.0: The option has been moved to metrics.statsd_port

statsd_prefix (Deprecated)

Deprecated since version 2.0.0: The option has been moved to metrics.statsd_prefix

statsd_allow_list (Deprecated)

Deprecated since version 2.0.0: The option has been moved to metrics.statsd_allow_list

stat_name_handler (Deprecated)

Deprecated since version 2.0.0: The option has been moved to metrics.stat_name_handler

statsd_datadog_enabled (Deprecated)

Deprecated since version 2.0.0: The option has been moved to metrics.statsd_datadog_enabled

statsd_datadog_tags (Deprecated)

Deprecated since version 2.0.0: The option has been moved to metrics.statsd_datadog_tags

statsd_custom_client_path (Deprecated)

Deprecated since version 2.0.0: The option has been moved to metrics.statsd_custom_client_path

max_threads (Deprecated)

Deprecated since version 1.10.14: The option has been moved to scheduler.parsing_processes

[kerberos]

ccache

Type

string

Default

/tmp/airflow_krb5_ccache

Environment Variable

AIRFLOW__KERBEROS__CCACHE

principal

gets augmented with fqdn

Type

string

Default

airflow

Environment Variable

AIRFLOW__KERBEROS__PRINCIPAL

reinit_frequency

Type

string

Default

3600

Environment Variable

AIRFLOW__KERBEROS__REINIT_FREQUENCY

kinit_path

Type

string

Default

kinit

Environment Variable

AIRFLOW__KERBEROS__KINIT_PATH

keytab

Type

string

Default

airflow.keytab

Environment Variable

AIRFLOW__KERBEROS__KEYTAB

[github_enterprise]

api_rev

Type

string

Default

v3

Environment Variable

AIRFLOW__GITHUB_ENTERPRISE__API_REV

[elasticsearch]

host

New in version 1.10.4.

Elasticsearch host

Type

string

Default

''

Environment Variable

AIRFLOW__ELASTICSEARCH__HOST

log_id_template

New in version 1.10.4.

Format of the log_id, which is used to query for a given tasks logs

Type

string

Default

{dag_id}-{task_id}-{execution_date}-{try_number}

Environment Variable

AIRFLOW__ELASTICSEARCH__LOG_ID_TEMPLATE

end_of_log_mark

New in version 1.10.4.

Used to mark the end of a log stream for a task

Type

string

Default

end_of_log

Environment Variable

AIRFLOW__ELASTICSEARCH__END_OF_LOG_MARK

frontend

New in version 1.10.4.

Qualified URL for an elasticsearch frontend (like Kibana) with a template argument for log_id Code will construct log_id using the log_id template from the argument above. NOTE: The code will prefix the https:// automatically, don’t include that here.

Type

string

Default

''

Environment Variable

AIRFLOW__ELASTICSEARCH__FRONTEND

write_stdout

New in version 1.10.4.

Write the task logs to the stdout of the worker, rather than the default files

Type

string

Default

False

Environment Variable

AIRFLOW__ELASTICSEARCH__WRITE_STDOUT

json_format

New in version 1.10.4.

Instead of the default log formatter, write the log lines as JSON

Type

string

Default

False

Environment Variable

AIRFLOW__ELASTICSEARCH__JSON_FORMAT

json_fields

New in version 1.10.4.

Log fields to also attach to the json output, if enabled

Type

string

Default

asctime, filename, lineno, levelname, message

Environment Variable

AIRFLOW__ELASTICSEARCH__JSON_FIELDS

host_field

New in version 2.1.1.

The field where host name is stored (normally either host or host.name)

Type

string

Default

host

Environment Variable

AIRFLOW__ELASTICSEARCH__HOST_FIELD

offset_field

New in version 2.1.1.

The field where offset is stored (normally either offset or log.offset)

Type

string

Default

offset

Environment Variable

AIRFLOW__ELASTICSEARCH__OFFSET_FIELD

[elasticsearch_configs]

use_ssl

New in version 1.10.5.

Type

string

Default

False

Environment Variable

AIRFLOW__ELASTICSEARCH_CONFIGS__USE_SSL

verify_certs

New in version 1.10.5.

Type

string

Default

True

Environment Variable

AIRFLOW__ELASTICSEARCH_CONFIGS__VERIFY_CERTS

[kubernetes]

pod_template_file

New in version 1.10.11.

Path to the YAML pod file. If set, all other kubernetes-related fields are ignored.

Type

string

Default

''

Environment Variable

AIRFLOW__KUBERNETES__POD_TEMPLATE_FILE

worker_container_repository

The repository of the Kubernetes Image for the Worker to Run

Type

string

Default

''

Environment Variable

AIRFLOW__KUBERNETES__WORKER_CONTAINER_REPOSITORY

worker_container_tag

The tag of the Kubernetes Image for the Worker to Run

Type

string

Default

''

Environment Variable

AIRFLOW__KUBERNETES__WORKER_CONTAINER_TAG

namespace

The Kubernetes namespace where airflow workers should be created. Defaults to default

Type

string

Default

default

Environment Variable

AIRFLOW__KUBERNETES__NAMESPACE

delete_worker_pods

If True, all worker pods will be deleted upon termination

Type

string

Default

True

Environment Variable

AIRFLOW__KUBERNETES__DELETE_WORKER_PODS

delete_worker_pods_on_failure

New in version 1.10.11.

If False (and delete_worker_pods is True), failed worker pods will not be deleted so users can investigate them. This only prevents removal of worker pods where the worker itself failed, not when the task it ran failed.

Type

string

Default

False

Environment Variable

AIRFLOW__KUBERNETES__DELETE_WORKER_PODS_ON_FAILURE

worker_pods_creation_batch_size

New in version 1.10.3.

Number of Kubernetes Worker Pod creation calls per scheduler loop. Note that the current default of “1” will only launch a single pod per-heartbeat. It is HIGHLY recommended that users increase this number to match the tolerance of their kubernetes cluster for better performance.

Type

string

Default

1

Environment Variable

AIRFLOW__KUBERNETES__WORKER_PODS_CREATION_BATCH_SIZE

multi_namespace_mode

New in version 1.10.12.

Allows users to launch pods in multiple namespaces. Will require creating a cluster-role for the scheduler

Type

boolean

Default

False

Environment Variable

AIRFLOW__KUBERNETES__MULTI_NAMESPACE_MODE

in_cluster

Use the service account kubernetes gives to pods to connect to kubernetes cluster. It’s intended for clients that expect to be running inside a pod running on kubernetes. It will raise an exception if called from a process not running in a kubernetes environment.

Type

string

Default

True

Environment Variable

AIRFLOW__KUBERNETES__IN_CLUSTER

cluster_context

New in version 1.10.3.

When running with in_cluster=False change the default cluster_context or config_file options to Kubernetes client. Leave blank these to use default behaviour like kubectl has.

Type

string

Default

None

Environment Variable

AIRFLOW__KUBERNETES__CLUSTER_CONTEXT

config_file

New in version 1.10.3.

Path to the kubernetes configfile to be used when in_cluster is set to False

Type

string

Default

None

Environment Variable

AIRFLOW__KUBERNETES__CONFIG_FILE

kube_client_request_args

New in version 1.10.4.

Keyword parameters to pass while calling a kubernetes client core_v1_api methods from Kubernetes Executor provided as a single line formatted JSON dictionary string. List of supported params are similar for all core_v1_apis, hence a single config variable for all apis. See: https://raw.githubusercontent.com/kubernetes-client/python/41f11a09995efcd0142e25946adc7591431bfb2f/kubernetes/client/api/core_v1_api.py

Type

string

Default

''

Environment Variable

AIRFLOW__KUBERNETES__KUBE_CLIENT_REQUEST_ARGS

delete_option_kwargs

New in version 1.10.12.

Optional keyword arguments to pass to the delete_namespaced_pod kubernetes client core_v1_api method when using the Kubernetes Executor. This should be an object and can contain any of the options listed in the v1DeleteOptions class defined here: https://github.com/kubernetes-client/python/blob/41f11a09995efcd0142e25946adc7591431bfb2f/kubernetes/client/models/v1_delete_options.py#L19

Type

string

Default

''

Environment Variable

AIRFLOW__KUBERNETES__DELETE_OPTION_KWARGS

Example

{"grace_period_seconds": 10}

enable_tcp_keepalive

Enables TCP keepalive mechanism. This prevents Kubernetes API requests to hang indefinitely when idle connection is time-outed on services like cloud load balancers or firewalls.

Type

boolean

Default

True

Environment Variable

AIRFLOW__KUBERNETES__ENABLE_TCP_KEEPALIVE

tcp_keep_idle

When the enable_tcp_keepalive option is enabled, TCP probes a connection that has been idle for tcp_keep_idle seconds.

Type

integer

Default

120

Environment Variable

AIRFLOW__KUBERNETES__TCP_KEEP_IDLE

tcp_keep_intvl

When the enable_tcp_keepalive option is enabled, if Kubernetes API does not respond to a keepalive probe, TCP retransmits the probe after tcp_keep_intvl seconds.

Type

integer

Default

30

Environment Variable

AIRFLOW__KUBERNETES__TCP_KEEP_INTVL

tcp_keep_cnt

When the enable_tcp_keepalive option is enabled, if Kubernetes API does not respond to a keepalive probe, TCP retransmits the probe tcp_keep_cnt number of times before a connection is considered to be broken.

Type

integer

Default

6

Environment Variable

AIRFLOW__KUBERNETES__TCP_KEEP_CNT

verify_ssl

Set this to false to skip verifying SSL certificate of Kubernetes python client.

Type

boolean

Default

True

Environment Variable

AIRFLOW__KUBERNETES__VERIFY_SSL

worker_pods_pending_timeout

New in version 2.1.0.

How long in seconds a worker can be in Pending before it is considered a failure

Type

integer

Default

300

Environment Variable

AIRFLOW__KUBERNETES__WORKER_PODS_PENDING_TIMEOUT

worker_pods_pending_timeout_check_interval

New in version 2.1.0.

How often in seconds to check if Pending workers have exceeded their timeouts

Type

integer

Default

120

Environment Variable

AIRFLOW__KUBERNETES__WORKER_PODS_PENDING_TIMEOUT_CHECK_INTERVAL

worker_pods_pending_timeout_batch_size

New in version 2.1.0.

How many pending pods to check for timeout violations in each check interval. You may want this higher if you have a very large cluster and/or use multi_namespace_mode.

Type

integer

Default

100

Environment Variable

AIRFLOW__KUBERNETES__WORKER_PODS_PENDING_TIMEOUT_BATCH_SIZE

[smart_sensor]

use_smart_sensor

New in version 2.0.0.

When use_smart_sensor is True, Airflow redirects multiple qualified sensor tasks to smart sensor task.

Type

boolean

Default

False

Environment Variable

AIRFLOW__SMART_SENSOR__USE_SMART_SENSOR

shard_code_upper_limit

New in version 2.0.0.

shard_code_upper_limit is the upper limit of shard_code value. The shard_code is generated by hashcode % shard_code_upper_limit.

Type

integer

Default

10000

Environment Variable

AIRFLOW__SMART_SENSOR__SHARD_CODE_UPPER_LIMIT

shards

The number of running smart sensor processes for each service.

Type

integer

Default

5

Environment Variable

AIRFLOW__SMART_SENSOR__SHARDS

sensors_enabled

New in version 2.0.0.

comma separated sensor classes support in smart_sensor.

Type

string

Default

NamedHivePartitionSensor

Environment Variable

AIRFLOW__SMART_SENSOR__SENSORS_ENABLED

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