Rails 图像未从 docker-compose.yml 运行

Question

I have a rails application that runs on Docker. My source code have the following files:

Dockerfile

FROM ruby:2.6.0
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
CMD bash -c "rm -f tmp/pids/server.pid && rails s -p 3000 -b '0.0.0.0'"

docker-compose.yml

version: '3'
services:
 db:
  image: postgres
  volumes:
   - ./tmp/db:/var/lib/postgresql/data
  ports:
    - "5432:5432"
 redis:
  image: redis
  command: redis-server
  ports: 
    - "6379:6379"
 sidekiq:
  build: .
  command: bundle exec sidekiq
  depends_on:
    - redis
  volumes: 
    - .:/myapp
 web:
  build: .
  command: bash -c "rm -f tmp/pids/server.pid && rails s -p 3000 -b '0.0.0.0'"
  volumes:
   - .:/myapp
  ports:
   - "3000:3000"
  depends_on:
   - db
   - redis
   - sidekiq

It runs normally using docker-compose up since I'm running this with the source code level.

Now when I build this app and push it to Dockerhub

docker build -t myusername/rails-app .
docker push myusername/rails-app

I'm expecting that I can run the rails app from an independent docker-compose.yml separately from the source code.

version: '3'
services:
 db:
  image: postgres
  volumes:
   - ./tmp/db:/var/lib/postgresql/data
  ports:
    - "5432:5432"
 redis:
  image: redis
  command: redis-server
  ports: 
    - "6379:6379"
 sidekiq:
  build: .
  command: bundle exec sidekiq
  depends_on:
    - redis
  volumes: 
    - .:/myapp
 web:
  image: myusername/rails-app:latest # <= Running the app now from the image
  command: bash -c "rm -f tmp/pids/server.pid && rails s -p 3000 -b '0.0.0.0'"
  volumes:
   - .:/myapp
  ports:
   - "3000:3000"
  depends_on:
   - db
   - redis
   - sidekiq

The only containers running are redis and db . The web is looking for this

Could not locate Gemfile or .bundle/ directory

Answer 1

In the second docker-compose.yml file, the one that should work somewhere else without the source code, you're still having the volume mounting the local folder in the container:

  volumes: 
    - .:/myapp

Remove that from the sidekiq and web containers and it should work.

You've also kept the build: . for the sidekiq container which is useful only for the development box. Replace it with the image attribute, pointing to your image.

To summarise your docker-comspose.yaml file:

version: '3'
services:
 db:
  image: postgres
  volumes:
   - ./tmp/db:/var/lib/postgresql/data
  ports:
    - "5432:5432"
 redis:
  image: redis
  command: redis-server
  ports: 
    - "6379:6379"
 sidekiq:
  image: myusername/rails-app:latest
  command: bundle exec sidekiq
  depends_on:
    - redis
 web:
  image: myusername/rails-app:latest # <= Running the app now from the image
  command: bash -c "rm -f tmp/pids/server.pid && rails s -p 3000 -b '0.0.0.0'"
  ports:
   - "3000:3000"
  depends_on:
   - db
   - redis
   - sidekiq