Bundler 锁定在 docker + 无法安装 gems（已解决 - docker CMD vs ENTRYPOINT）

Question

更新：我已将 [or a?] 问题缩小到 services: app: volumes 词典中的 - groupy-gemcache:/usr/local/bundle 行。如果我删除它，容器运行没问题 [我认为] 但大概我丢失了我的本地 gem 缓存。

tldr：在运行ning docker-compose 构建之后，一切似乎都正常，但我不能运行 any gem 或 bundle 在我的运行ning docker 容器中，如果我向我的 gem 文件添加内容。例如，在 docker-compose build && docker-compose run app bash:

之后

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.

我仍然是 docker 的新手，但我一直在尝试配置一个完美的 docker 文件，它可以构建、缓存 gem 和更新，同时仍然提交它的 Gemfile.lock 到 git [也许这实际上并不完美，我愿意接受那里的建议]。在我的用例中，我使用 docker 包含图像的 rails 应用程序和 sidekiq worker 以及 postgres 和 redis 图像的组合文件 - 与 here and here 描述的设置非常相似。

我的 Dockerfile [注释掉了我从上面的教程中拼凑的一些东西：

    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"]

docker-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。问题来自我的 ENTRYPOINT dockerfile 命令，如 this article on CMD vs ENTRYPOINT.

末尾所述

我相信 ENTRYPOINT ["bundle", "exec"] 与 CMD ["./script/start.sh"] 或 docker-compose run app bash 的结果是运行像 bundle exec 'bash' 这样的命令。我通过从 dockerfile 中删除入口点，如上所述输入 shell 并手动运行ning bundle exec 'bash' 来确认这一点，果然我降落在我不能的 subshell t 运行任何捆绑包或 gem 命令 - 必须 exit 两次才能离开。

Bundler 锁定在 docker + 无法安装 gems（已解决 - docker CMD vs ENTRYPOINT）

Bundler locks in docker + can't install gems (Solved- docker CMD vs ENTRYPOINT)

ruby

rubygems

bundler

docker