bitnami-containers/bitnami/mastodon

Bitnami Secure Image for Mastodon

Mastodon is self-hosted social network server based on ActivityPub. Written in Ruby, features real-time updates, multimedia attachments and no vendor lock-in.

Overview of Mastodon Trademarks: This software listing is packaged by Bitnami. The respective trademarks mentioned in the offering are owned by the respective companies, and use of them does not imply any affiliation or endorsement.

TL;DR

docker run -it --name mastodon bitnami/mastodon

Using docker-compose.yml

The docker-compose.yaml file of this container can be found in the Bitnami Containers repository.

https://github.com/bitnami/containers/tree/main/bitnami/mastodon/docker-compose.yml

Please be aware this file has not undergone internal testing. Consequently, we advise its use exclusively for development or testing purposes. For production-ready deployments, we highly recommend utilizing its associated Bitnami Helm chart.

Why use Bitnami Secure Images?

Those are hardened, minimal CVE images built and maintained by Bitnami. Bitnami Secure Images are based on the cloud-optimized, security-hardened enterprise OS Photon Linux. Why choose BSI images?

• Hardened secure images of popular open source software with Near-Zero Vulnerabilities
• Vulnerability Triage & Prioritization with VEX Statements, KEV and EPSS Scores
• Compliance focus with FIPS, STIG, and air-gap options, including secure bill of materials (SBOM)
• Software supply chain provenance attestation through in-toto
• First class support for the internet’s favorite Helm charts

Each image comes with valuable security metadata. You can view the metadata in our public catalog here. Note: Some data is only available with commercial subscriptions to BSI.

If you are looking for our previous generation of images based on Debian Linux, please see the Bitnami Legacy registry.

Supported tags and respective Dockerfile links

Learn more about the Bitnami tagging policy and the difference between rolling tags and immutable tags in our documentation page.

Get this image

The Bitnami Mastodon Docker image is only available to Bitnami Secure Images customers.

Configuration

The following section describes the supported environment variables

Environment variables

The following tables list the main variables you can set.

Customizable environment variables

Name	Description	Default Value
MASTODON_MODE	Mastodon service to run (can be web, streaming or sidekiq).	web
ALLOW_EMPTY_PASSWORD	Allow an empty password.	no
MASTODON_CREATE_ADMIN	Create admin for Mastodon.	true
MASTODON_ADMIN_USERNAME	Mastodon admin username.	user
MASTODON_ADMIN_PASSWORD	Mastodon admin password.	bitnami1
MASTODON_ADMIN_EMAIL	Mastodon admin email.	user@bitnami.org
MASTODON_ALLOW_ALL_DOMAINS	Allow accessing Mastodon with any domain.	true
MASTODON_SECRET_KEY_BASE	Mastodon secret key base.	bitnami123
MASTODON_OTP_SECRET	Mastodon OTP secret.	bitnami123
MASTODON_HTTPS_ENABLED	Enable HTTPS in Mastodon.	false
MASTODON_ASSETS_PRECOMPILE	Run rake assets:precompile on startup.	true
MASTODON_WEB_DOMAIN	Mastodon web domain (for generating links).	127.0.0.1
MASTODON_WEB_HOST	Mastodon web host (for the streaming and sidekiq services to access).	mastodon
MASTODON_WEB_PORT_NUMBER	Mastodon web port.	3000
MASTODON_STREAMING_PORT_NUMBER	Mastodon streaming port.	4000
MASTODON_AUTHORIZED_FETCH	Use secure mode.	false
MASTODON_LIMITED_FEDERATION_MODE	Use an allow-list for federating with other servers.	false
MASTODON_STREAMING_API_BASE_URL	Mastodon public api base url.	ws://localhost:${MASTODON_STREAMING_PORT_NUMBER}
MASTODON_SMTP_LOGIN	SMTP server authentication username.	5432
MASTODON_SMTP_PASSWORD	SMTP server authentication password.	bitnami_mastodon
RAILS_SERVE_STATIC_FILES	Have puma server the static files in the public/ folder	true
MASTODON_BIND_ADDRESS	Address to listen for interfaces	0.0.0.0
MASTODON_DATA_TO_PERSIST	Data to persist from installations.	$MASTODON_ASSETS_DIR $MASTODON_SYSTEM_DIR
MASTODON_USE_LIBVIPS	Use libvips for image processing instead of ImageMagick.	true
MASTODON_MIGRATE_DATABASE	Run rake db:migrate job.	true
MASTODON_DATABASE_HOST	Database server host.	postgresql
MASTODON_DATABASE_PORT_NUMBER	Database server port.	5432
MASTODON_DATABASE_NAME	Database name.	bitnami_mastodon
MASTODON_DATABASE_USERNAME	Database user name.	bn_mastodon
MASTODON_DATABASE_PASSWORD	Database user password.	nil
MASTODON_DATABASE_POOL	Number of DB pool processes.	5
MASTODON_REDIS_HOST	Redis server host.	redis
MASTODON_REDIS_PORT_NUMBER	Redis server port.	6379
MASTODON_REDIS_PASSWORD	Redis user password.	nil
MASTODON_ELASTICSEARCH_ENABLED	Enable Elasticsearch.	true
MASTODON_MIGRATE_ELASTICSEARCH	Run rake chewy:upgrade on startup.	true
MASTODON_ELASTICSEARCH_HOST	Elasticsearch server host.	elasticsearch
MASTODON_ELASTICSEARCH_PORT_NUMBER	Elasticsearch server port.	9200
MASTODON_ELASTICSEARCH_USER	Elasticsearch user.	elastic
MASTODON_ELASTICSEARCH_PASSWORD	Elasticsearch user password.	nil
MASTODON_S3_ENABLED	Enable S3	false
MASTODON_S3_BUCKET	S3 Bucket for storing data	bitnami_mastodon
MASTODON_S3_HOSTNAME	S3 endpoint	minio
MASTODON_S3_PROTOCOL	S3 protocol (can be https or http)	http
MASTODON_S3_PORT_NUMBER	S3 port	9000
MASTODON_S3_ALIAS_HOST	S3 route for uploaded files (for generating links in Mastodon)	localhost:${MASTODON_S3_PORT_NUMBER}
MASTODON_AWS_SECRET_ACCESS_KEY	AWS secret access key	nil
MASTODON_AWS_ACCESS_KEY_ID	AWS access key id	nil
MASTODON_S3_REGION	S3 region	us-east-1
MASTODON_S3_ENDPOINT	S3 endpoint	${MASTODON_S3_PROTOCOL}://${MASTODON_S3_HOSTNAME}:${MASTODON_S3_PORT_NUMBER}
MASTODON_STARTUP_ATTEMPTS	Startup check attempts.	40

Read-only environment variables

Name	Description	Value
MASTODON_BASE_DIR	Mastodon installation directory.	${BITNAMI_ROOT_DIR}/mastodon
MASTODON_VOLUME_DIR	Mastodon volume directory.	/bitnami/mastodon
MASTODON_ASSETS_DIR	Mastodon public assets directory.	${MASTODON_BASE_DIR}/public/assets
MASTODON_SYSTEM_DIR	Mastodon public system directory.	${MASTODON_BASE_DIR}/public/system
MASTODON_TMP_DIR	Mastodon tmp directory.	${MASTODON_BASE_DIR}/tmp
MASTODON_LOGS_DIR	Mastodon logs directory.	${MASTODON_BASE_DIR}/log
NODE_ENV	Node.js environment mode	production
RAILS_ENV	Rails environment mode	production
MASTODON_DAEMON_USER	Mastodon daemon system user.	mastodon
MASTODON_DAEMON_GROUP	Mastodon daemon system group.	mastodon

Run mode

Mastodon supports three running modes:

• Web: The Mastodon web frontend. It is the essential functional element of Mastodon.
• Streaming: Necessary for performing real-time interactions inside Mastodon.
• Sidekiq: Performs background operations like sending emails.

The running mode is defined via the MASTODON_MODE environment variable. The possible values are web, streaming and sidekiq.

FIPS configuration in Bitnami Secure Images

The Bitnami Mastodon Docker image from the Bitnami Secure Images catalog includes extra features and settings to configure the container with FIPS capabilities. You can configure the next environment variables:

• OPENSSL_FIPS: whether OpenSSL runs in FIPS mode or not. yes (default), no.

Logging

The Bitnami Mastodon Docker image sends the container logs to the stdout. You can configure the containers logging driver using the --log-driver option if you wish to consume the container logs differently. In the default configuration docker uses the json-file driver.

License

Copyright © 2026 Broadcom. The term "Broadcom" refers to Broadcom Inc. and/or its subsidiaries.

Licensed 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.