Ruby 捆扎机锁定在docker+；can'；t安装gems（已解决-docker CMD vs ENTRYPOINT）

更新：我已将[或？]问题缩小到我的

服务：app:volumes

字典中的

-groupy-gemcache:/usr/local/bundle

行。如果我删除它，容器运行正常[我认为]，但我可能会丢失本地gem缓存

tldr：在运行docker compose build之后，事情似乎还可以，但是如果我向gemfile中添加了一些内容，我就不能在我正在运行的docker容器中运行任何

gem

或

bundle

。例如，在

docker compose构建和&docker compose运行应用程序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dockerfile，它可以构建、缓存gems和更新，同时仍然将Gemfile.lock提交给git[也许这并不完美，我愿意接受那里的建议]。在我的使用案例中，我使用了一个docker compose文件，其中包含rails应用程序和sidekiq worker的图像，以及postgres和redis图像——与所描述的设置和描述非常相似

我的Dockerfile[我从上面的教程中拼凑出一些东西：

    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

---

哇，我想出来了。问题来自于我的ENTRYPOINT dockerfile命令，如本章末尾所述

---

我相信

ENTRYPOINT[“bundle”，“exec”]

与

CMD[“/script/start.sh”]的结果

或

docker compose run应用程序bash

将运行类似于

bundle exec'bash'

的命令。我确认了这一点，从dockerfile中删除入口点，如上所述进入shell并手动运行

bundle exec'bash'

，果然我进入了一个无法运行任何bundle或gem命令的子shell退出两次，然后离开。

非常高兴您发布了此消息，我收到了相同的错误消息，并从ENTRYPOINT切换到CMD，使docker compose运行web bundle安装work