[RUBY] Procedure for introducing Docker into the development environment of existing Rails applications [Rails, MySQL, Docker]

Hello. This time, I summarized the procedure to introduce Docker to the development environment of the existing Rails application. I haven't studied enough yet, so I would appreciate it if you could point out any corrections or improvements.

Advance preparation

-Install Docker-for-mac --Existing Rails app (This time I will use the simple household account book app I created earlier.)


Ruby:2.5.3 Rails: MySQL:5.6 Docker:19.03.8 docker-compose:1.25.4


1. Add Dockerfile, docker-compose.yml to the root directory


Create Dockerfile and docker-compose.yml directly under the root directory of your existing Rails app. Below are the contents of each file.


FROM ruby:2.5.3
RUN apt-get update && apt-get install -y \
    build-essential \
WORKDIR /kakeibo
COPY Gemfile Gemfile.lock /kakeibo/
RUN bundle install

--For the FROM ruby: 2.5.3 part, match it with the Ruby version of the app. --RUN apt-get update && apt-get install -y ~ to install the required packages. --Create a folder in the container with WORKDIR / kakeibo. --Copy Gemfile and Gemfile.lock into the container with COPY Gemfile Gemfile.lock / kakeibo /, then run bundle install.


version: '3'


    build: .
    command: bundle exec rails s -p 3000 -b ''
      - '3000:3000'
      - '.:/kakeibo'
    tty: true
    stdin_open: true
      - db
      - db

    image: mysql:5.6
      - 'mysql-data:/var/lib/mysql'
      - 'MYSQL_ROOT_PASSWORD=password'

A detailed explanation of the contents of Dockerfile and docker-compose.yml is summarized in this article.

2. Edit config / database.yml

default: &default
  adapter: mysql2
  encoding: utf8
  pool: <%= ENV.fetch("RAILS_MAX_THREADS") { 5 } %>
  username: root
  password: password
  host: db

  <<: *default
  database: kakeibo_development

Match the password and host in config / database.yml to the values set in docker-compose.yml.

3. Start container

$ docker-compose build
$ docker-compose up -d
$ docker-compose exec web rails db:create
$ docker-compose exec web rails db:migrate

Now when you visit http: // localhost: 3000, you should be able to see the app successfully.


-Procedure for developing an existing rails project with Docker -Procedure to install Docker in existing Rails app -Create an existing application development environment with Docker [Ruby2.6 + Rails5.2 + Mysql5.7] -[Rails] Procedure for creating Rails + MySQL development environment with Docker -Docker beginners carefully summarize the procedure for building a virtual environment with Rails + PostgreSQL or MySQL -#Linux #Ubuntu #docker #Dockerfile What is this? apt-get install --no-install-recommends -"Dockerfile Best Practices"

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