docker +中的Bundler鎖定無法安裝寶石（Solved-docker CMD vs ENTRYPOINT）

Question

更新：我已將[或a？]問題縮小到我的services: app: volumes字典中的- groupy-gemcache:/usr/local/bundle行。如果我刪除它，容器運行正常[我認爲]，但大概我失去了我當地的寶石緩存。

tldr：運行搬運工，撰寫構建之後，事情似乎好，但我不能運行任何gem或bundle在我的運行搬運工容器，如果我補充一下我的Gemfile。例如，後docker-compose build && docker-compose run app bash：

root@2ea58aff612e:/src# bundle check 
The Gemfile's dependencies are satisfied 
root@2ea58aff612e:/src# echo 'gem "hello-world"' >> Gemfile 
root@2ea58aff612e:/src# bundle 
Could not find gem 'hello-world' in any of the gem sources listed in your Gemfile. 
Run `bundle install` to install missing gems. 
root@2ea58aff612e:/src# bundle install 
Could not find gem 'hello-world' in any of the gem sources listed in your Gemfile. 
Run `bundle install` to install missing gems. 
root@2ea58aff612e:/src# gem 
Could not find gem 'hello-world' in any of the gem sources listed in your Gemfile. 
Run `bundle install` to install missing gems. 
root@2ea58aff612e:/src# gem env 
Could not find gem 'hello-world' in any of the gem sources listed in your Gemfile. 
Run `bundle install` to install missing gems. 

我還是蠻新手與碼頭工人，但我一直在嘗試配置，可以構建一個完美的dockerfile，緩存寶石和更新，同時還承諾其Gemfile.lock的與git [也許這實際上並不完美，我願意接受建議]。在我的使用案例中，我使用了一個docker撰寫文件，其中包含rails應用程序和sidekiq工作人員的圖像以及postgres和redis圖像 - 非常類似於描述here和here的設置。

我Dockerfile [有些事情註釋掉了，我從上面的教程鵝卵石：

FROM ruby:2.3 
    ENTRYPOINT ["bundle", "exec"] 
    ARG bundle_path 
    # throw errors if Gemfile has been modified since Gemfile.lock 
    # RUN bundle config --global frozen 1 
    ENV INSTALL_PATH /src 
    RUN mkdir -p $INSTALL_PATH 
    WORKDIR $INSTALL_PATH 



    # Install dependencies: 
    # - build-essential: To ensure certain gems can be compiled 
    # - nodejs: Compile assets 
    # - npm: Install node modules 
    # - libpq-dev: Communicate with postgres through the postgres gem 
    # - postgresql-client-9.4: In case you want to talk directly to postgres 
    RUN apt-get update && apt-get install -qq -y build-essential nodejs npm libpq-dev postgresql-client-9.4 --fix-missing --no-install-recommends && \ 
    rm -rf /var/lib/apt/lists/* 

    COPY app/Gemfile app/Gemfile.lock ./ 

    # Bundle and then save the updated Gemfile.lock in our volume since it will be clobbered in the next step 
    RUN echo $bundle_path && bundle install --path=$bundle_path && \ 
    cp Gemfile.lock $bundle_path 

    # ./app contains the rails app on host 
    COPY app . 

    # Unclobber the updated gemfile.lock 
    RUN mv $bundle_path/Gemfile.lock ./ 

    CMD ["./script/start.sh"] 

泊塢窗，compose.yml：

version: '2' 
volumes: 
    groupy-redis: 
    groupy-postgres: 
    groupy-gemcache: 

services: 
    app: 
    build: 
     args: 
     bundle_path: /usr/local/bundle 
     context: . 
     dockerfile: Dockerfile 
    command: "./script/start.sh" 
    links: 
     - postgres 
     - redis 
    volumes: 
     - ./app:/src 
     - groupy-gemcache:/usr/local/bundle 
    ports: 
     - '3000:3000' 
    env_file: 
     - .docker.env 
    stdin_open: true 
    tty: true 

Answer 1

哇，我想通了。問題來自我的ENTRYPOINT dockerfile命令，如this article on CMD vs ENTRYPOINT末尾解釋的那樣。

我相信ENTRYPOINT ["bundle", "exec"]與CMD ["./script/start.sh"]或docker-compose run app bash的結果是運行一個命令，如bundle exec 'bash'。我通過從dockerfile中刪除入口點來確認這一點，如上所述輸入shell並手動運行bundle exec 'bash'，果然我登錄了一個子shell，在那裏我無法運行任何bundle或gem命令 - 必須兩次離開exit。