As a memorandum of my own, I will leave an article on how to build an environment with Rails 6 + PostgreSQL with Docker. This time, we will create the app name as shopping_app.
.
├── Dockerfile
├── docker-compose.yml
└── shopping_app
├── Gemfile
└── Gemfile.lock
First, create a Dockerfile.
FROM ruby:2.7.2
ENV LANG C.UTF-8
RUN 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
RUN apt-get update -qq && \
apt-get install -y build-essential \
libpq-dev \
nodejs \
postgresql-client yarn
RUN mkdir /app
RUN mkdir /app/shopping_app
ENV APP_ROOT /app/shopping_app
WORKDIR $APP_ROOT
ADD ./shopping_app/Gemfile $APP_ROOT/Gemfile
ADD ./shopping_app/Gemfile.lock $APP_ROOT/Gemfile.lock
RUN bundle install
ADD . $APP_ROOT
Create docker-compose.yml. This time the port is set to 1501.
version: '3'
services:
postgres:
image: postgres
ports:
- "3306:3306"
volumes:
- ./tmp/db:/var/lib/postgresql/data #For MacOS
environment:
POSTGRES_USER: 'admin'
POSTGRES_PASSWORD: 'admin-pass'
restart: always
app:
build: .
image: rails
container_name: 'app'
command: bundle exec rails s -p 1501 -b '0.0.0.0'
ports:
- "1501:1501"
environment:
VIRTUAL_PORT: 80
volumes:
- ./shopping_app:/app/shopping_app
depends_on:
- postgres
restart: always
volumes:
app_postgre:
external: true
source 'https://rubygems.org'
gem 'rails', '6.0.3'
You can leave Gemfile.lock empty.
$ docker-compose run app rails new . --force --database=postgresql --skip-bundle
docker-compose run app rails webpacker:install
Set the database.yml of the created app.
default: &default
adapter: postgresql
encoding: unicode
# For details on connection pooling, see Rails configuration guide
# https://guides.rubyonrails.org/configuring.html#database-pooling
pool: <%= ENV.fetch("RAILS_MAX_THREADS") { 5 } %>
#Describe the following
user: admin
password: admin-pass
host: postgres
docker-compose build
docker-compose run app rails db:create
This completes the construction. Launch the app with the following command
docker-compose up
http://localhost:1501/ If you access, it will be displayed on the following screen.
that's all.
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