documentation/content/en/admin/config.md

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---
title: Configuring variables
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docs:
weight: 30
parent: admin
---
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This page is under construction.
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Mastodon uses environment variables as its configuration.
For convenience, it can read them from a flat file called `.env.production` in the Mastodon directory, but they can always be overridden by a specific process. For example, systemd service files can read environment variables from an `EnvironmentFile` or from inline definitions with `Environment`, so you can have different configuration parameters for specific services. They can also be specified when calling Mastodon from the command line.
### Basic <a id="basic"></a>
#### Federation <a id="federation"></a>
* `LOCAL_DOMAIN`
* `WEB_DOMAIN`
* `ALTERNATE_DOMAINS`
#### Secrets <a id="secrets"></a>
* `SECRET_KEY_BASE`
* `OTP_SECRET`
* `VAPID_PRIVATE_KEY`
* `VAPID_PUBLIC_KEY`
#### Deployment <a id="deployment"></a>
* `RAILS_ENV`
* `RAILS_SERVE_STATIC_FILES`
* `RAILS_LOG_LEVEL`
* `TRUSTED_PROXY_IP`
* `SOCKET`
* `PORT`
* `NODE_ENV`
* `BIND`
#### Scaling options <a id="scaling-options"></a>
* `WEB_CONCURRENCY`
* `MAX_THREADS`
* `PREPARED_STATEMENTS`
* `STREAMING_API_BASE_URL`
* `STREAMING_CLUSTER_NUM`
### Database connections <a id="database-connections"></a>
#### PostgreSQL <a id="postgresql"></a>
* `DB_HOST`
* `DB_USER`
* `DB_NAME`
* `DB_PASS`
* `DB_PORT`
* `DATABASE_URL`
#### Redis <a id="redis"></a>
* `REDIS_HOST`
* `REDIS_PORT`
* `REDIS_URL`
* `REDIS_NAMESPACE`
* `CACHE_REDIS_HOST`
* `CACHE_REDIS_PORT`
* `CACHE_REDIS_URL`
* `CACHE_REDIS_NAMESPACE`
#### ElasticSearch <a id="elasticsearch"></a>
* `ES_ENABLED`
* `ES_HOST`
* `ES_PORT`
* `ES_PREFIX`
#### StatsD <a id="statsd"></a>
* `STATSD_ADDR`
* `STATSD_NAMESPACE`
### Limits <a id="limits"></a>
* `SINGLE_USER_MODE`
* `EMAIL_DOMAIN_WHITELIST`
* `DEFAULT_LOCALE`
* `MAX_SESSION_ACTIVATIONS`
* `USER_ACTIVE_DAYS`
### E-mail <a id="e-mail"></a>
* `SMTP_SERVER`
* `SMTP_PORT`
* `SMTP_LOGIN`
* `SMTP_PASSWORD`
* `SMTP_FROM_ADDRESS`
* `SMTP_DOMAIN`
* `SMTP_DELIVERY_METHOD`
* `SMTP_AUTH_METHOD`
* `SMTP_CA_FILE`
* `SMTP_OPENSSL_VERIFY_MODE`
* `SMTP_ENABLE_STARTTLS_AUTO`
* `SMTP_TLS`
### File storage <a id="file-storage"></a>
* `CDN_HOST`
* `S3_ALIAS_HOST`
#### Local file storage <a id="local-file-storage"></a>
* `PAPERCLIP_ROOT_PATH`
* `PAPERCLIP_ROOT_URL`
#### Amazon S3 and compatible <a id="amazon-s3-and-compatible"></a>
* `S3_ENABLED`
* `S3_BUCKET`
* `AWS_ACCESS_KEY_ID`
* `AWS_SECRET_ACCESS_KEY`
* `S3_REGION`
* `S3_PROTOCOL`
* `S3_HOSTNAME`
* `S3_ENDPOINT`
* `S3_SIGNATURE_VERSION`
#### Swift <a id="swift"></a>
* `SWIFT_ENABLED`
* `SWIFT_USERNAME`
* `SWIFT_TENANT`
* `SWIFT_PASSWORD`
* `SWIFT_PROJECT_ID`
* `SWIFT_AUTH_URL`
* `SWIFT_CONTAINER`
* `SWIFT_OBJECT_URL`
* `SWIFT_REGION`
* `SWIFT_DOMAIN_NAME`
* `SWIFT_CACHE_TTL`
### External authentication <a id="external-authentication"></a>
* `OAUTH_REDIRECT_AT_SIGN_IN`
#### LDAP <a id="ldap"></a>
* `LDAP_ENABLED`
* `LDAP_HOST`
* `LDAP_PORT`
* `LDAP_METHOD`
* `LDAP_BASE`
* `LDAP_BIND_DN`
* `LDAP_PASSWORD`
* `LDAP_UID`
* `LDAP_SEARCH_FILTER`
#### PAM <a id="pam"></a>
* `PAM_ENABLED`
* `PAM_EMAIL_DOMAIN`
* `PAM_DEFAULT_SERVICE`
* `PAM_CONTROLLED_SERVICE`
#### CAS <a id="cas"></a>
* `CAS_ENABLED`
* `CAS_URL`
* `CAS_HOST`
* `CAS_PORT`
* `CAS_SSL`
* `CAS_VALIDATE_URL`
* `CAS_CALLBACK_URL`
* `CAS_LOGOUT_URL`
* `CAS_LOGIN_URL`
* `CAS_UID_FIELD`
* `CAS_CA_PATH`
* `CAS_DISABLE_SSL_VERIFICATION`
* `CAS_UID_KEY`
* `CAS_NAME_KEY`
* `CAS_EMAIL_KEY`
* `CAS_NICKNAME_KEY`
* `CAS_FIRST_NAME_KEY`
* `CAS_LAST_NAME_KEY`
* `CAS_LOCATION_KEY`
* `CAS_IMAGE_KEY`
* `CAS_PHONE_KEY`
#### SAML <a id="saml"></a>
* `SAML_ENABLED`
* `SAML_ACS_URL`
* `SAML_ISSUER`
* `SAML_IDP_SSO_TARGET_URL`
* `SAML_IDP_CERT`
* `SAML_IDP_CERT_FINGERPRINT`
* `SAML_NAME_IDENTIFIER_FORMAT`
* `SAML_CERT`
* `SAML_PRIVATE_KEY`
* `SAML_SECURITY_WANT_ASSERTION_SIGNED`
* `SAML_SECURITY_WANT_ASSERTION_ENCRYPTED`
* `SAML_SECURITY_ASSUME_EMAIL_IS_VERIFIED`
* `SAML_ATTRIBUTES_STATEMENTS_UID`
* `SAML_ATTRIBUTES_STATEMENTS_EMAIL`
* `SAML_ATTRIBUTES_STATEMENTS_FULL_NAME`
* `SAML_ATTRIBUTES_STATEMENTS_FIRST_NAME`
* `SAML_ATTRIBUTES_STATEMENTS_LAST_NAME`
* `SAML_UID_ATTRIBUTE`
* `SAML_ATTRIBUTES_STATEMENTS_VERIFIED`
* `SAML_ATTRIBUTES_STATEMENTS_VERIFIED_EMAIL`
### Hidden services <a id="hidden-services"></a>
* `http_proxy`
* `ALLOW_ACCESS_TO_HIDDEN_SERVICE`
### Other <a id="other"></a>
* `SKIP_POST_DEPLOYMENT_MIGRATIONS`