Readme.md

Create an empty lock file

touch Gemfile.lock

Create the rails app

docker-compose run web rails new . --webpack --skip-turbolinks --skip-spring --skip-test --force --database=postgresql

Shell into a container to start coding

docker-compose run --rm shell

References: https://docs.docker.com/compose/rails/#connect-the-database

Docker Compose v3 documentation

https://docs.docker.com/compose/compose-file/

Postgres 9.5 documentation

https://www.postgresql.org/docs/9.5/static/index.html

babelrc

{
  "presets": [
    ["env", {
      "modules": false,
      "targets": {
        "browsers": "> 1%",
        "uglify": true
      },
      "useBuiltIns": true
    }]
  ],
  "env": {
    "test": {
      "presets": ["es2015",
        ["env", {
          "modules": false,
          "targets": {
            "browsers": "> 1%",
            "uglify": true
          },
          "useBuiltIns": true
        }]
      ]
    }
  },
  "plugins": [
    "syntax-dynamic-import",
    "transform-object-rest-spread",
    ["transform-class-properties", { "spec": true }],
    ["transform-runtime", { "polyfill": false, "regenerator": true }]
  ]
}

bashrc

export SHELL='/bin/bash'
export LS_OPTIONS='--color=auto'
eval "`dircolors`"
alias ls='ls $LS_OPTIONS'
alias ll='ls $LS_OPTIONS -l'
alias l='ls $LS_OPTIONS -lA'
alias be='bundle exec'

database.yml

default: &default
  adapter: postgresql
  encoding: unicode
  host: db
  username: admin
  password: admin_password
  pool: <%= ENV.fetch("RAILS_MAX_THREADS") { 5 } %>

development:
  <<: *default
  database: myapp_development


test:
  <<: *default
  database: myapp_test

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

docker-compose.yml

version: '3'
services:
  db:
    image: postgres:9.5.3
    ports:
      - "5432:5432"
    environment:
      - TERM=xterm
      - POSTGRES_PASSWORD=admin_password
      - POSTGRES_USER=admin
      - POSTGRES_DB=mycrm_development
  web:
    build: .
    volumes:
      - .:/usr/src/app:delegated
    working_dir: /usr/src/app
    environment:
      RAILS_ENV: development
      NODE_ENV: development
    ports:
      - "3000:3000"
    depends_on:
      - db
  shell:
    build: .
    command: /bin/bash
    volumes:
      - .:/usr/src/app:delegated
    working_dir: /usr/src/app
    environment:
      RAILS_ENV: development
      NODE_ENV: development
    stdin_open: true
    tty: true
    ports:
      - "3000:3000"
    depends_on:
      - db

docker-entrypoint.sh

#!/usr/bin/env bash

log() {
  echo -e "## $(date +%FT%H:%M:%S%z) ${0} ${@}"
}

log "Initializing container..."

log "Running bundle install ..."
bundle install --jobs 4 && log "Finished installing new gems."


log "Environment:" && env | sort

log "RAILS_ENV=${RAILS_ENV}"

cd /usr/src/app

log "Clearing tmp ..."
bundle exec rails tmp:clear
rm /usr/src/app/tmp/pids/server.pid

log "Starting foreman ..."
bundle exec foreman start

Dockerfile

FROM ruby:2.4.2

ENV DEBIAN_FRONTEND noninteractive
ENV TERM xterm

ADD bashrc /root/.bashrc

RUN echo "deb http://apt.postgresql.org/pub/repos/apt/ jessie-pgdg main" >> /etc/apt/sources.list.d/pgdg.list && \
    wget --quiet -O - https://www.postgresql.org/media/keys/ACCC4CF8.asc | apt-key add -
RUN apt-get -qqy update && \
    apt-get install -qqy --no-install-recommends \
      ca-certificates                            \
      curl                                       \
      dnsutils                                   \
      git                                        \
      jq                                         \
      libgsf-1-dev                               \
      lsb-release                                \
      lsof                                       \
      net-tools                                  \
      netcat                                     \
      procps                                     \
      traceroute                                 \
      unzip                                      \
      vim                                        \
      wget                                       \
      postgresql-client-9.6                      \
    && curl -s https://raw.githubusercontent.com/h2non/bimg/master/preinstall.sh | bash - \
    && rm -rf /var/lib/apt/lists/* /tmp/* /var/tmp/*

RUN apt-get update -qq && apt-get install -y build-essential libpq-dev

RUN curl -sL https://deb.nodesource.com/setup_8.x | bash -
RUN apt-get install -y nodejs

RUN npm i -g yarn

RUN mkdir -p /usr/src/app
WORKDIR /usr/src/app

RUN bundle config --global frozen 0

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

RUN bundle install

COPY . /usr/src/app
ADD docker-entrypoint.sh /usr/src/app/docker-entrypoint.sh
RUN chmod +x /usr/src/app/docker-entrypoint.sh

CMD ["/usr/src/app/docker-entrypoint.sh"]

Gemfile

source 'https://rubygems.org'
gem 'rails', '5.1.4'

package.json

{
  "name": "myapp",
  "private": true,
  "dependencies": {
    "@rails/webpacker": "^3.0.2",
    "bootstrap": "^3.3.7",
    "vue": "^2.5.3",
    "vue-loader": "^13.5.0",
    "vue-template-compiler": "^2.5.3"
  },
  "devDependencies": {
    "webpack-dev-server": "^2.9.4"
  },
  "scripts": {
    "start:dev": "webpack-dev-server --config config/webpack/development.js"
  }
}

Procfile

rails: bundle exec rails s -p 3000 -b '0.0.0.0'
webpack: yarn run start:dev