docker-compose运行Rails

1.新建空目录，名字可以叫Rails

2.新建Dockerfile并添加如下内容

FROM ruby:2.5
RUN apt-get update -qq && apt-get install -y build-essential libpq-dev nodejs
RUN mkdir /myapp
WORKDIR /myapp
COPY Gemfile /myapp/Gemfile
COPY Gemfile.lock /myapp/Gemfile.lock
RUN bundle install
COPY . /myapp

3.新建Gemfile并添加如下内容

source 'https://rubygems.org'
gem 'rails', '5.2.0'

4.创建一个空Gemfile.lock来构建我们的Dockerfile

 touch Gemfile.lock

5.编写docker-compose.yml

version: '3'
services:
  db:
    image: postgres
    volumes:
      - ./tmp/db:/var/lib/postgresql/data
  web:
    build: .
    command: bundle exec rails s -p 3000 -b '0.0.0.0'
    volumes:
      - .:/myapp
    ports:
      - "3000:3000"
    depends_on:
      - db

6.有了上面这四个文件，现在可以使用docker-compose run生成Rails骨架应用程序

docker-compose run web rails new . --fordatabase=postgresql

7.授权

sudo chown -R $USER:$USER .

8.构建

docker-compose build

9.用以下内容替换内容config/database.yml

default: &default
  adapter: postgresql
  encoding: unicode
  host: db
  username: postgres
  password:
  pool: 5

development:
  <<: *default
  database: myapp_development


test:
  <<: *default
  database: myapp_test

10.启动应用程序