我正在使用 docker 开发 Rails 应用程序。 docker 文件如下所示：
FROM ruby:1.9.3
RUN apt-get update -qq && apt-get install -y build-essential libpq-dev vim
ENV APP_HOME /next-reg
RUN mkdir $APP_HOME
WORKDIR $APP_HOME
ENV BUNDLE_PATH /box
ADD . $APP_HOME
RUN gem install gem1.gem gem2.gem
COPY Gemfile Gemfile
COPY Gemfile.lock Gemfile.lock
RUN bundle install
正如你所看到的，我改变了BUNDLE_PATH，这是因为一篇文章 https://medium.com/@fbzga/how-to-cache-bundle-install-with-docker-7bed453a5800#.5haparbbg展示我们如何保存 gem 下载。因此，当 docker 缓存变热时，它会重新捆绑并永远持续下去。
When I docker build它成功安装了 gem，但无法在捆绑包中找到它们。有人可以帮我持久化宝石，安装我自己的宝石，并让它工作吗？
在我改变之前BUNDLE_PATH构建工作正常，它只是经常重新捆绑，而无需更改 gem 文件（因为，我猜 docker 镜像缓存变热了）。
我的 docker-compose 是这样的：
db:
image: postgres
volumes:
- ~/.docker-voumes/postgres/data:/var/lib/postgresql/data
# This is to hold and persist ruby gems, referenced in web and in web's dockerfile.
gem_files:
image: busybox
volumes:
- /box
web:
build: .
command: bundle exec rails s -p 3000 -b '0.0.0.0'
volumes:
- .:/next-reg
volumes_from:
- gem_files
ports:
- "3000:3000"
- "8000:8000"
links:
- db
env_file:
- .myenv.env
我认为还缺乏GEM_HOME/GEM_PATH在你的代码中。
GEM_HOME/GEM_PATH将被 gem install xxx 用于在特定文件夹中安装 gem。BUNDLE_PATH将被bundle install用来在特定文件夹中安装gems，但不会被gem install xx使用
要拥有一个有效的系统，你应该这样做：
FROM ruby:1.9.3
RUN apt-get update -qq && apt-get install -y build-essential libpq-dev vim
ENV APP_HOME /next-reg
RUN mkdir $APP_HOME
WORKDIR $APP_HOME
ENV BUNDLE_PATH /box
ENV GEM_PATH /box
ENV GEM_HOME /box
ADD . $APP_HOME
RUN gem install bundler
RUN gem install tzinfo -v 1.2.2
COPY Gemfile Gemfile
RUN bundle install
有了这个 Gemfile ：
source 'https://rubygems.org'
gem 'tzinfo', '1.2.2'
这将产生：
Step 11/13 : RUN gem install tzinfo -v 1.2.2
---> Running in 8a87fa54fa19
Successfully installed thread_safe-0.3.6
Successfully installed tzinfo-1.2.2
2 gems installed
---> 3c91d59bde8a
Removing intermediate container 8a87fa54fa19
Step 13/13 : RUN bundle install
---> Running in 20f1e4ec93b1
Don't run Bundler as root. Bundler can ask for sudo if it is needed, and
installing your bundle as root will break this application for all non-root
users on this machine.
Fetching gem metadata from https://rubygems.org/...
Fetching version metadata from https://rubygems.org/.
Resolving dependencies...
Rubygems 1.8.23.2 is not threadsafe, so your gems will be installed one at a time. Upgrade to Rubygems 2.1.0 or higher to enable parallel gem installation.
Installing rake 12.0.0
Using thread_safe 0.3.6
Using bundler 1.14.6
Using tzinfo 1.2.2
Bundle complete! 2 Gemfile dependencies, 4 gems now installed.
Bundled gems are installed into /box.
正如您在结果输出中看到的，bundle install重新使用预加载的宝石gem install
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