[RUBY] How to build Rails 6 environment with Docker


I will introduce how to build a Rail 6 environment with Docker. Webpack was introduced from Rails6, and the procedure is a little different from Rails5, so I also considered that.

Docker official page Quickstart: Compose and Rails


Docker3 Rails6.0.3 Ruby2.7.1 DB:PostgeSQL

1. Create the required files

This time, we will build the environment in a folder named "myapp". If you want to change the name, please change "myapp" accordingly.

The file structure to be created from now on is as follows.

file organization


First, create a folder.


$ mkdir myapp
$ cd myapp

1.1 Dockerfile


$ touch Dockerfile


FROM ruby:2.7.1
RUN apt-get update -qq && apt-get install -y nodejs postgresql-client

##nodejs and yarn are required when installing webpack
#Install yarn package management tool
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

# Node.install js
RUN curl -sL https://deb.nodesource.com/setup_7.x | bash - && \
apt-get install nodejs

RUN mkdir /myapp
WORKDIR /myapp
COPY Gemfile /myapp/Gemfile
COPY Gemfile.lock /myapp/Gemfile.lock
RUN bundle install
COPY . /myapp

# 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"]

# Start the main process.
CMD ["rails", "server", "-b", ""]

1.2 Gemfile


$ touch Gemfile


source 'https://rubygems.org'
gem 'rails', '~>6'

1.3 Gemfile.lock


$ touch Gemfile.lock

Nothing is listed here.

1.4 entrypoint.sh


$ touch entrypoint.sh


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 "[email protected]"

1.5 docker-compose.yml


$ touch docker-compose.yml


version: '3'
    image: postgres
      - ./tmp/db:/var/lib/postgresql/data
    #######add to#########################

    build: .
    command: bash -c "rm -f tmp/pids/server.pid && bundle exec rails s -p 3000 -b ''"
      - .:/myapp
      - "3000:3000"
      - db

2. Build the project

2.1 rails new


$ docker-compose run web rails new . --force --no-deps --database=postgresql --skip-bundle

About command options --force: Overwrite the file even if it exists --no-deps: Do not start the linked service --database = postgresql: DB specifies PostgreSQL --skip-bundle: skip the bundle install (after creating the app)

2.2 docker-compose build Now that a new Gemfile has been created, use the following command to bundle install.


$ docker-compose build

2.3 Change the connection settings to DB


default: &default
  adapter: postgresql
  encoding: unicode
  pool: <%= ENV.fetch("RAILS_MAX_THREADS") { 5 } %>
  #####add to#####
  host: db
  username: postgres

  <<: *default
  database: myapp_development

  <<: *default
  database: myapp_test

  <<: *default
  database: myapp_production
  username: myapp
  password: <%= ENV['MYAPP_DATABASE_PASSWORD'] %>

2.4 Confirmation of Docker container startup


$ docker-compose up

It is OK if the container starts and connects to the server. I haven't created the DB yet, so I get the following error. スクリーンショット 2020-06-09 10.33.12.png

2.5 DB creation

Since I was able to connect to the server, I created a DB. After disconnecting with Ctrl + C


  #Stop Docker once
$ docker-compose stop
$ docker-compose down
  #DB creation
$ docker-compose run web rake db:create

  #Launch Docker again
$ docker-compose up

3. Make sure the container & server is running

If you connect to [http: // localhost: 3000 /](http: // localhost: 3000 /), you can confirm that it has started successfully. The version is Rails6, Ruby2.7.1 as set. スクリーンショット 2020-06-09 10.36.35.png


You need to use Docker commands when developing within Docker.

$ docker-compose run web bundle exec rails command


$ docker-compose run web bundle exec rails g model User
$ docker-compose run web bundle exec rails g controller Homepages index
$ docker-compose run web bundle exec rails g rspec:install 


Docker official page Quickstart: Compose and Rails Steps for building a Ruby on Rails environment with Docker [Rails 6 compatible] I was addicted to building a Rails 6 development environment with Docker Postgres Docker Image has changed and can no longer be started [Rails] ActiveRecord::NoDatabaseError [Docker]

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