Dokcerによる Rails:6.0, MySQL:8.0の環境構築

docker-compose.yml

version: "3"

# .envファイルに環境変数は指定
services:
  db:
    image: mysql:8.0
    environment:
      - MYSQL_ROOT_PASSWORD=$DB_PASSWORD
      - MYSQL_USER=$DB_USER
      - MYSQL_PASSWORD=$DB_PASSWORD
      - TZ=Asia/Tokyo
    command: mysqld --character-set-server=utf8mb4 --collation-server=utf8mb4_unicode_ci
    volumes:
    - mysql-data:/var/lib/mysql
    ports:
    - 3306:3306
  app:
    build: .
    command: /bin/bash -c "rm -f /$WORKDIR/tmp/pids/server.pid && bundle exec rails s -p 3000 -b '0.0.0.0'"
    volumes:
      - .:/$WORKDIR
      - ./vendor/bundle:/$WORKDIR/vendor/bundle
    environment:
      - TZ=Asia/Tokyo
      - DB_HOST=$DB_HOST
      - DB_USER=$DB_USER
      - DB_PASSWORD=$DB_PASSWORD
    ports:
      - $API_PORT:$CONTAINER_PORT
    depends_on:
      - db
    tty: true
    stdin_open: true
volumes:
  mysql-data:
    driver: local

Dokcerfile

Dokcerfile

FROM ruby:3.0

# yarnのインストール
RUN apt-get update && apt-get install -y curl apt-transport-https wget && \
    curl -sS https://dl.yarnpkg.com/debian/pubkey.gpg | apt-key add - && \
    echo "deb https://dl.yarnpkg.com/debian/ stable main" | tee /etc/apt/sources.list.d/yarn.list && \
    apt-get update && apt-get install -y yarn

RUN apt-get update && apt-get install -y nodejs 

WORKDIR /usr/src/app
COPY Gemfile Gemfile.lock ./

RUN bundle install

COPY . ./

COPY entrypoint.sh /usr/bin/
RUN chmod +x /usr/bin/entrypoint.sh
ENTRYPOINT ["entrypoint.sh"]
EXPOSE 3000

CMD ["rails", "server", "-b", "0.0.0.0"]

Gemfile

Gemfile

source 'https://rubygems.org'
gem 'rails', '~> 6.1'

Gemfile.lock

# empty

entrypoint.sh

entrypoint.sh

#!/bin/bash
set -e

# remove a potentially pre-existing server.pid for rails.
rm -f /myapp/tmp/pids/server.pid

# then exec the container's main process (what's set as cmd in the dockerfile).
exec "$@"