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wonderfall/mastodon

Your self-hosted, globally interconnected microblogging community.

Mastodon official website and source code.

Why this image?

This non-official image is intended as an all-in-one (as in monolithic) Mastodon production image. You should use the official image for development purpose or if you want scalability.

Security

Don't run random images from random dudes on the Internet. Ideally, you want to maintain and build it yourself.

Images are scanned every day by Trivy for OS vulnerabilities. They are rebuilt once a week, so you should often update your images regardless of your Mastodon version.

Features

Rootless image
Based on Alpine Linux
Includes hardened_malloc
Precompiled assets for Mastodon

Build-time variables

Variable	Description	Default
MASTODON_VERSION	version/commit of Mastodon	N/A
REPOSITORY	source of Mastodon	tootsuite/mastodon

Environment variables you should change

Variable	Description	Default
UID	user id (rebuild to change)	991
GID	group id (rebuild to change)	991
RUN_DB_MIGRATIONS	run migrations at startup	true
SIDEKIQ_WORKERS	number of Sidekiq workers	5

Don't forget to provide an environment file for Mastodon itself.

Volumes

Variable	Description
/mastodon/public/system	data files
/mastodon/log	logs

Ports

Port	Use
3000	Mastodon web
4000	Mastodon streaming

docker-compose example

Please use your own settings and adjust this example to your needs. Here I use Traefik v2 (already configured to redirect 80 to 443 globally).

version: '2.4'

networks:
  http_network:
    external: true

  mastodon_network:
    external: false
    internal: true

services:
  mastodon:
    image: ghcr.io/wonderfall/mastodon
    container_name: mastodon
    restart: unless-stopped
    security_opt:
      - no-new-privileges:true
    env_file: /wherever/docker/mastodon/.env.production
    depends_on:
      - mastodon-db
      - mastodon-redis
    volumes:
      - /wherever/docker/mastodon/data:/mastodon/public/system
      - /wherever/docker/mastodon/logs:/mastodon/log
    labels:
      - traefik.enable=true
      - traefik.http.routers.mastodon-web-secure.entrypoints=https
      - traefik.http.routers.mastodon-web-secure.rule=Host(`domain.tld`)
      - traefik.http.routers.mastodon-web-secure.tls=true
      - traefik.http.routers.mastodon-web-secure.middlewares=hsts-headers@file
      - traefik.http.routers.mastodon-web-secure.tls.certresolver=http
      - traefik.http.routers.mastodon-web-secure.service=mastodon-web
      - traefik.http.services.mastodon-web.loadbalancer.server.port=3000
      - traefik.http.routers.mastodon-streaming-secure.entrypoints=https
      - traefik.http.routers.mastodon-streaming-secure.rule=Host(`domain.tld`) && PathPrefix(`/api/v1/streaming`)
      - traefik.http.routers.mastodon-streaming-secure.tls=true
      - traefik.http.routers.mastodon-streaming-secure.middlewares=hsts-headers@file
      - traefik.http.routers.mastodon-streaming-secure.tls.certresolver=http
      - traefik.http.routers.mastodon-streaming-secure.service=mastodon-streaming
      - traefik.http.services.mastodon-streaming.loadbalancer.server.port=4000
      - traefik.docker.network=http_network
    networks:
      - mastodon_network
      - http_network
 
   mastodon-redis:
    image: redis:alpine
    container_name: mastodon-redis
    restart: unless-stopped
    security_opt:
      - no-new-privileges:true
    volumes:
      - /wherever/docker/mastodon/redis:/data
    networks:
      - mastodon_network

  mastodon-db:
    image: postgres:9.6-alpine
    container_name: mastodon-db
    restart: unless-stopped
    security_opt:
      - no-new-privileges:true
    volumes:
      - /wherever/docker/mastodon/db:/var/lib/postgresql/data
    environment:
      - POSTGRES_USER=mastodon
      - POSTGRES_DB=mastodon
      - POSTGRES_PASSWORD=supersecretpassword
    networks:
      - mastodon_network

This image has been tested and works great with the gVisor runtime.

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