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In order to kickstart the application we need to install the rails gem and run the
rails new <appname> command. We will do this inside the same Docker container
that will be used to run the application itself. To do so we need to create a
Dockerfile to create the Docker image with the necessary dependencies, a
docker-compose.yml file to provision the other services needed (a postgres
database and a volume store) and a Gemfile (with an empty Gemfile.lock) to
install the rails gem and bundle install its dependencies.
Create a new directory and some empty files:
$ mkdir rails-docker
$ cd rails-docker
$ touch Dockerfile docker-compose.yml Gemfile Gemfile.lock
Copy and paste the following content in the respective files:
File: Dockerfile
FROM ruby:2.3.1
ENV APP_ROOT /app
ENV BUNDLE_PATH /bundle
RUN apt-get update -qq && \
apt-get install -y build-essential libpq-dev nodejs
WORKDIR $APP_ROOT
ADD . $APP_ROOT
File: docker-compose.yml
version: '2'
services:
store:
# data-only container
image: postgres:latest # reuse postgres container
volumes:
- /var/lib/postgresql/data
command: "true"
db:
image: postgres
ports:
- 5432:5432
volumes_from:
- store # connect postgres and the data-only container
environment:
- POSTGRES_USER=postgres
- POSTGRES_PASSWORD=postgres
- POSTGRES_DB=rails_docker_database
web:
build: .
ports:
- 3000:3000
volumes:
- .:/app
# This tells the web container to mount the `bundle` images'
# /bundle volume to the `web` containers /bundle path.
volumes_from:
- bundle
links:
- db
command: ./bin/start.sh
environment:
- PORT=3000
- DB_HOST=db
- DB_PORT=5432
- DB_NAME=rails_docker_database
- DB_USER=postgres
- DB_PSWD=postgres
bundle:
image: busybox
volumes:
- /bundle
File: Gemfile
source 'https://rubygems.org'
gem 'rails', '~> 5'
First we need to bundle the rails 5 dependencies:
$ docker-compose run web bundle --jobs=10 --retry=5
And then use the rails new command to create the new application:
$ docker-compose run web bundle exec rails new . --force --database=postgresql --skip-bundle
We need to change slightly the database configuration to use the environment variables set in the docker-compose file:
File: config/database.yml
default: &default
adapter: postgresql
encoding: unicode
username: <%= ENV['DB_USER'] %>
password: <%= ENV['DB_PSWD'] %>
host: <%= ENV['DB_HOST'] %>
# For details on connection pooling, see rails configuration guide
# http://guides.rubyonrails.org/configuring.html#database-pooling
pool: <%= ENV.fetch("RAILS_MAX_THREADS") { 5 } %>
development:
<<: *default
database: <%= ENV['DB_NAME'] %>
test:
<<: *default
database: app_test
$ docker-compose run web bin/setup
Create a start.sh file in the bin dir:
File: bin/start.sh
#!/bin/bash
bundle check || bundle install
if [ -f tmp/pids/server.pid ]; then
rm -f tmp/pids/server.pid
fi
bundle exec rails s -p $PORT -b 0.0.0.0
It automatically removes the server.pid that will create problems when you stop
and restart the app.
Make the file executable with the chmod command:
$ chmod +x bin/start.sh
Finally start your newly created Rails application and visit localhost:3000:
$ docker-compose up
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