Rails7.1 APIモード + PostgreSQL + Docker + Renderの環境構築からデプロイまで

# syntax=docker/dockerfile:1
FROM ruby:3.2.2
RUN apt-get update -qq && apt-get install -y nodejs postgresql-client
WORKDIR /sample-app
COPY Gemfile /sample-app/Gemfile
COPY Gemfile.lock /sample-app/Gemfile.lock
RUN bundle install

# Add a script to be executed every time the container starts.
COPY entrypoint.sh /usr/bin/
RUN chmod +x /usr/bin/entrypoint.sh
ENTRYPOINT ["entrypoint.sh"]
EXPOSE 3000

# Configure the main process to run when running the image
CMD ["rails", "server", "-b", "0.0.0.0"]

# syntax=docker/dockerfile:1
FROM ruby:3.2.2
RUN apt-get update -qq && apt-get install -y nodejs postgresql-client
WORKDIR /sample-app
COPY Gemfile /sample-app/Gemfile
COPY Gemfile.lock /sample-app/Gemfile.lock
RUN bundle install

# Add a script to be executed every time the container starts.
COPY entrypoint.sh /usr/bin/
RUN chmod +x /usr/bin/entrypoint.sh
ENTRYPOINT ["entrypoint.sh"]
EXPOSE 3000

# Configure the main process to run when running the image
CMD ["rails", "server", "-b", "0.0.0.0"]

services:
  db:
    image: postgres
    volumes:
      - db-data:/var/lib/postgresql/data
    environment:
      POSTGRES_PASSWORD: password
  web:
    build: .
    command: bash -c "rm -f tmp/pids/server.pid && bundle exec rails s -p 3000 -b '0.0.0.0'"
    volumes:
      - .:/sample-app
    ports:
      - "3000:3000"
    depends_on:
      - db
volumes:
  db-data:

source 'https://rubygems.org'
gem 'rails', '7.1.2'

# 空ファイルを用意

#!/bin/bash
set -e

# Remove a potentially pre-existing server.pid for Rails.
rm -f /sample-app/tmp/pids/server.pid

# Then exec the container's main process (what's set as CMD in the Dockerfile).
exec "$@"

$ docker compose run --rm --no-deps web rails new . --force --database=postgresql --api

# syntax = docker/dockerfile:1

# Make sure RUBY_VERSION matches the Ruby version in .ruby-version and Gemfile
ARG RUBY_VERSION=3.2.2
FROM registry.docker.com/library/ruby:$RUBY_VERSION-slim as base

# Rails app lives here
WORKDIR /rails

# Set production environment
ENV RAILS_ENV="production" \
    BUNDLE_DEPLOYMENT="1" \
    BUNDLE_PATH="/usr/local/bundle" \
    BUNDLE_WITHOUT="development"


# Throw-away build stage to reduce size of final image
FROM base as build

# Install packages needed to build gems
RUN apt-get update -qq && \
    apt-get install --no-install-recommends -y build-essential git libpq-dev libvips pkg-config

# Install application gems
COPY Gemfile Gemfile.lock ./
RUN bundle install && \
    rm -rf ~/.bundle/ "${BUNDLE_PATH}"/ruby/*/cache "${BUNDLE_PATH}"/ruby/*/bundler/gems/*/.git && \
    bundle exec bootsnap precompile --gemfile

# Copy application code
COPY . .

# Precompile bootsnap code for faster boot times
RUN bundle exec bootsnap precompile app/ lib/


# Final stage for app image
FROM base

# Install packages needed for deployment
RUN apt-get update -qq && \
    apt-get install --no-install-recommends -y curl libvips postgresql-client && \
    rm -rf /var/lib/apt/lists /var/cache/apt/archives

# Copy built artifacts: gems, application
COPY --from=build /usr/local/bundle /usr/local/bundle
COPY --from=build /rails /rails

# Run and own only the runtime files as a non-root user for security
RUN useradd rails --create-home --shell /bin/bash && \
    chown -R rails:rails db log storage tmp
USER rails:rails

# Entrypoint prepares the database.
ENTRYPOINT ["/rails/bin/docker-entrypoint"]

# Start the server by default, this can be overwritten at runtime
EXPOSE 3000
CMD ["./bin/rails", "server"]

services:
  db:
    image: postgres
    volumes:
      - db-data:/var/lib/postgresql/data
    environment:
      POSTGRES_PASSWORD: password
  web:
    build:
      # 開発環境用に追記
      context: .
      dockerfile: Dockerfile.dev
    command: bash -c "rm -f tmp/pids/server.pid && bundle exec rails s -p 3000 -b '0.0.0.0'"
    volumes:
      - .:/sample-app
    ports:
      - "3000:3000"
    depends_on:
      - db
volumes:
  db-data:

services:
  db:
    image: postgres
    volumes:
      - db-data:/var/lib/postgresql/data
    environment:
      POSTGRES_PASSWORD: password
  web:
    build:
      # production環境用に追記
      context: .
      dockerfile: Dockerfile.prod
    command: bash -c "rm -f tmp/pids/server.pid && bundle exec rails s -p 3000 -b '0.0.0.0'"
    volumes:
      - .:/sample-app
    ports:
      - "3000:3000"
    depends_on:
      - db
volumes:
  db-data:

$ docker compose -f compose-dev.yaml build

#0 0.288 Bundler 2.4.10 is running, but your lockfile was generated with 2.3.26. Installing Bundler 2.3.26 and restarting using that version.
#0 6.233 Fetching gem metadata from https://rubygems.org/.
#0 6.267 Fetching bundler 2.3.26
#0 6.463 Installing bundler 2.3.26
#0 6.677 Your Ruby version is 3.2.2, but your Gemfile specified 3.1.4

default: &default
  adapter: postgresql
  encoding: unicode
  # 以下の3行を追加
  host: db
  username: postgres
  password: password
  # For details on connection pooling, see Rails configuration guide
  # https://guides.rubyonrails.org/configuring.html#database-pooling
  pool: <%= ENV.fetch("RAILS_MAX_THREADS") { 5 } %>

$ docker compose -f compose-dev.yaml run --rm web rake db:create
[+] Running 1/1
 ✔ Container sample-app-db-1  Created                                                                                                                                       0.1s 
[+] Running 1/1
 ✔ Container sample-app-db-1  Started                                                                                                                                       0.4s 
Created database 'sample_app_development'
Created database 'sample_app_test'

$ docker compose -f compose-dev.yaml up
web-1  | => Booting Puma
web-1  | => Rails 7.1.2 application starting in development 
web-1  | => Run `bin/rails server --help` for more startup options
web-1  | Puma starting in single mode...
web-1  | * Puma version: 6.4.0 (ruby 3.2.2-p53) ("The Eagle of Durango")
web-1  | *  Min threads: 5
web-1  | *  Max threads: 5
web-1  | *  Environment: development
web-1  | *          PID: 1
web-1  | * Listening on http://0.0.0.0:3000
web-1  | Use Ctrl-C to stop