Dockerfile

# syntax=docker/dockerfile:1.4

# Please see https://docs.docker.com/engine/reference/builder for information about
# the extended buildx capabilities used in this file.
# Make sure multiarch TARGETPLATFORM is available for interpolation
# See: https://docs.docker.com/build/building/multi-platform/
ARG TARGETPLATFORM=${TARGETPLATFORM}
ARG BUILDPLATFORM=${BUILDPLATFORM}

# Ruby image to use for base image, change with [--build-arg RUBY_VERSION="3.2.2"]
ARG RUBY_VERSION="3.2.2"
# # Node version to use in base image, change with [--build-arg NODE_MAJOR_VERSION="20"]
ARG NODE_MAJOR_VERSION="20"
# Debian image to use for base image, change with [--build-arg DEBIAN_VERSION="bookworm"]
ARG DEBIAN_VERSION="bookworm"
# Node image to use for base image based on combined variables (ex: 20-bookworm-slim)
FROM docker.io/node:${NODE_MAJOR_VERSION}-${DEBIAN_VERSION}-slim as node
# Ruby image to use for base image based on combined variables (ex: 3.2.2-slim-bookworm)
FROM docker.io/ruby:${RUBY_VERSION}-slim-${DEBIAN_VERSION} as ruby

# Resulting version string is vX.X.X-MASTODON_VERSION_PRERELEASE+MASTODON_VERSION_METADATA
# Example: v4.2.0-nightly.2023.11.09+something
# Overwrite existance of 'alpha.0' in version.rb [--build-arg MASTODON_VERSION_PRERELEASE="nightly.2023.11.09"]
ARG MASTODON_VERSION_PRERELEASE=""
# Append build metadata or fork information to version.rb [--build-arg MASTODON_VERSION_METADATA="something"]
ARG MASTODON_VERSION_METADATA=""

# Allow Ruby on Rails to serve static files
# See: https://docs.joinmastodon.org/admin/config/#rails_serve_static_files
ARG RAILS_SERVE_STATIC_FILES="true"
# Allow to use YJIT compiler
# See: https://github.com/ruby/ruby/blob/master/doc/yjit/yjit.md
ARG RUBY_YJIT_ENABLE="1"
# Timezone used by the Docker container and runtime, change with [--build-arg TZ=Europe/Berlin]
ARG TZ="Etc/UTC"
# Linux UID (user id) for the mastodon user, change with [--build-arg UID=1234]
ARG UID="991"
# Linux GID (group id) for the mastodon user, change with [--build-arg GID=1234]
ARG GID="991"

# Apply Mastodon build options based on options above
ENV \
# Apply Mastodon version information
  MASTODON_VERSION_PRERELEASE="${MASTODON_VERSION_PRERELEASE}" \
  MASTODON_VERSION_METADATA="${MASTODON_VERSION_METADATA}" \
# Apply Mastodon static files and YJIT options
  RAILS_SERVE_STATIC_FILES=${RAILS_SERVE_STATIC_FILES} \
  RUBY_YJIT_ENABLE=${RUBY_YJIT_ENABLE} \
# Apply timezone
  TZ=${TZ}

ENV \
# Configure the IP to bind Mastodon to when serving traffic
  BIND="0.0.0.0" \
# Use production settings for Yarn, Node and related nodejs based tools
  NODE_ENV="production" \
# Use production settings for Ruby on Rails
  RAILS_ENV="production" \
# Add Ruby and Mastodon installation to the PATH
  DEBIAN_FRONTEND="noninteractive" \
  PATH="${PATH}:/opt/ruby/bin:/opt/mastodon/bin" \
# Optimize jemalloc 5.x performance
  MALLOC_CONF="narenas:2,background_thread:true,thp:never,dirty_decay_ms:1000,muzzy_decay_ms:0"

# Set default shell used for running commands
SHELL ["/bin/bash", "-o", "pipefail", "-o", "errexit", "-c"]

ARG TARGETPLATFORM

RUN echo "Target platform is $TARGETPLATFORM"

RUN \
# Remove automatic apt cache Docker cleanup scripts
  rm -f /etc/apt/apt.conf.d/docker-clean; \
# Sets timezone
  echo "${TZ}" > /etc/localtime; \
# Creates mastodon user/group and sets home directory
  groupadd -g "${GID}" mastodon; \
  useradd -l -u "${UID}" -g "${GID}" -m -d /opt/mastodon mastodon; \
# Creates /mastodon symlink to /opt/mastodon
  ln -s /opt/mastodon /mastodon;

# Set /opt/mastodon as working directory
WORKDIR /opt/mastodon

# hadolint ignore=DL3008,DL3005
RUN \
# Mount Apt cache and lib directories from Docker buildx caches
--mount=type=cache,id=apt-cache-${TARGETPLATFORM},target=/var/cache/apt,sharing=locked \
--mount=type=cache,id=apt-lib-${TARGETPLATFORM},target=/var/lib/apt,sharing=locked \
# Apt update & upgrade to check for security updates to Debian image
  apt-get update; \
  apt-get dist-upgrade -yq; \
# Install jemalloc, curl and other necessary components
  apt-get install -y --no-install-recommends \
    ca-certificates \
    curl \
    ffmpeg \
    file \
    imagemagick \
    libjemalloc2 \
    patchelf \
    procps \
    tini \
    tzdata \
  ; \
# Patch Ruby to use jemalloc
  patchelf --add-needed libjemalloc.so.2 /usr/local/bin/ruby; \
# Discard patchelf after use
  apt-get purge -y \
    patchelf \
  ;

# Create temporary build layer from base image
FROM ruby as build

# Copy Node package configuration files into working directory
COPY package.json yarn.lock .yarnrc.yml /opt/mastodon/
COPY .yarn /opt/mastodon/.yarn

COPY --from=node /usr/local/bin /usr/local/bin
COPY --from=node /usr/local/lib /usr/local/lib

ARG TARGETPLATFORM

# hadolint ignore=DL3008
RUN \
# Mount Apt cache and lib directories from Docker buildx caches
--mount=type=cache,id=apt-cache-${TARGETPLATFORM},target=/var/cache/apt,sharing=locked \
--mount=type=cache,id=apt-lib-${TARGETPLATFORM},target=/var/lib/apt,sharing=locked \
# Install build tools and bundler dependencies from APT
  apt-get install -y --no-install-recommends \
    g++ \
    gcc \
    git \
    libgdbm-dev \
    libgmp-dev \
    libicu-dev \
    libidn-dev \
    libpq-dev \
    libssl-dev \
    make \
    shared-mime-info \
    zlib1g-dev \
  ;

RUN \
# Configure Corepack
  rm /usr/local/bin/yarn*; \
  corepack enable; \
  corepack prepare --activate;

# Create temporary bundler specific build layer from build layer
FROM build as bundler

ARG TARGETPLATFORM

# Copy Gemfile config into working directory
COPY Gemfile* /opt/mastodon/

RUN \
# Mount Ruby Gem caches
--mount=type=cache,id=gem-cache-${TARGETPLATFORM},target=/usr/local/bundle/cache/,sharing=locked \
# Configure bundle to prevent changes to Gemfile and Gemfile.lock
  bundle config set --global frozen "true"; \
# Configure bundle to not cache downloaded Gems
  bundle config set --global cache_all "false"; \
# Configure bundle to only process production Gems
  bundle config set --local without "development test"; \
# Configure bundle to not warn about root user
  bundle config set silence_root_warning "true"; \
# Download and install required Gems
  bundle install -j"$(nproc)";

# Create temporary node specific build layer from build layer
FROM build as yarn

ARG TARGETPLATFORM

# Copy Node package configuration files into working directory
COPY package.json yarn.lock .yarnrc.yml /opt/mastodon/
COPY streaming/package.json /opt/mastodon/streaming/
COPY .yarn /opt/mastodon/.yarn

# hadolint ignore=DL3008
RUN \
--mount=type=cache,id=corepack-cache-${TARGETPLATFORM},target=/usr/local/share/.cache/corepack,sharing=locked \
--mount=type=cache,id=yarn-cache-${TARGETPLATFORM},target=/usr/local/share/.cache/yarn,sharing=locked \
# Install Node packages
  yarn workspaces focus --production @mastodon/mastodon;

# Create temporary assets build layer from build layer
FROM build as precompiler

# Copy Mastodon sources into precompiler layer
COPY . /opt/mastodon/

# Copy bundler and node packages from build layer to container
COPY --from=yarn /opt/mastodon /opt/mastodon/
COPY --from=bundler /opt/mastodon /opt/mastodon/
COPY --from=bundler /usr/local/bundle/ /usr/local/bundle/

ARG TARGETPLATFORM

RUN \
# Use Ruby on Rails to create Mastodon assets
  OTP_SECRET=precompile_placeholder SECRET_KEY_BASE=precompile_placeholder bundle exec rails assets:precompile; \
# Cleanup temporary files
  rm -fr /opt/mastodon/tmp;

# Prep final Mastodon Ruby layer
FROM ruby as mastodon

ARG TARGETPLATFORM

# hadolint ignore=DL3008
RUN \
# Mount Apt cache and lib directories from Docker buildx caches
--mount=type=cache,id=apt-cache-${TARGETPLATFORM},target=/var/cache/apt,sharing=locked \
--mount=type=cache,id=apt-lib-${TARGETPLATFORM},target=/var/lib/apt,sharing=locked \
# Mount Corepack and Yarn caches from Docker buildx caches
--mount=type=cache,id=corepack-cache-${TARGETPLATFORM},target=/usr/local/share/.cache/corepack,sharing=locked \
--mount=type=cache,id=yarn-cache-${TARGETPLATFORM},target=/usr/local/share/.cache/yarn,sharing=locked \
# Apt update install non-dev versions of necessary components
  apt-get install -y --no-install-recommends \
    libssl3 \
    libpq5 \
    libicu72 \
    libidn12 \
    libreadline8 \
    libyaml-0-2 \
  ;

# Copy Mastodon sources into final layer
COPY . /opt/mastodon/

# Copy compiled assets to layer
COPY --from=precompiler /opt/mastodon/public/packs /opt/mastodon/public/packs
COPY --from=precompiler /opt/mastodon/public/assets /opt/mastodon/public/assets
# Copy bundler components to layer
COPY --from=bundler /usr/local/bundle/ /usr/local/bundle/

RUN \
# Precompile bootsnap code for faster Rails startup
  bundle exec bootsnap precompile --gemfile app/ lib/;

RUN \
# Pre-create and chown system volume to Mastodon user
  mkdir -p /opt/mastodon/public/system; \
  chown mastodon:mastodon /opt/mastodon/public/system;

# Set the running user for resulting container
USER mastodon
# Expose default Puma ports
EXPOSE 3000
# Set container tini as default entry point
ENTRYPOINT ["/usr/bin/tini", "--"]