如何将包添加到已存在的图像？ [英] How do I add a package to an already existing image?

问题描述

我有一个使用Gemfile中指定的imagemagick的RoR应用程序。我正在使用 Docker的官方栏目图片，使用以下Dockerfile构建我的图片：

  FROM rails：onbuild 
运行apt-get install imagemagick 
  

并收到以下错误：

 无法安装RMagick 2.13.2。不能在/ usr / local / bundle / bin中找到Magick-config：/ usr / local / sbin：/ usr / local / bin：/ usr / sbin：/ usr / bin：/ sbin：/ bin 
  

现在，这可能是因为在操作系统上缺少imagemagic软件包，即使我在Docker文件中指定了它。所以我想在运行apt-get 命令发出之前，我已经发出了 bundle install 命令。

我的问题 - 使用这个基本映像，是否有一种方法来确保在捆绑之前安装imagemagic？

我需要fork和更改基本的Dockerfile才能实现吗？

解决方案

你是对的， ONBUILD 来自 rails：onbuild 图像将在 FROM 您的Dockerfile指令。

我建议更改Dockerfile如下： p>

  FROM ruby​​：2.2.0 
运行apt-get install imagemagick 
 
＃throw errors if G emfile已经修改，因为Gemfile.lock 
 RUN bundle config --global frozen 1 
 
 RUN mkdir -p / usr / src / app 
 WORKDIR / usr / src / app 
 
运行apt-get update&& apt-get install -y nodejs --no-install-recommendations&& rm -rf / var / lib / apt / lists / * 
 RUN apt-get update&& apt-get install -y mysql-client postgresql-client sqlite3 --no-install-recommendations&& rm -rf / var / lib / apt / lists / * 
 
 
 COPY Gemfile / usr / src / app / 
 COPY Gemfile.lock / usr / src / app / 
运行捆绑安装
 
 COPY。 / usr / src / app 
 
 EXPOSE 3000 
 CMD [rails，server] 
  

我根据 rails： onbuild Dockerfile 向下移动 ONBUILD 说明，并删除 ONBUILD flavor。

I have a RoR app that uses imagemagick specified in the Gemfile. I am using Docker's official rails image to build my image with the following Dockerfile:

FROM rails:onbuild
RUN apt-get install imagemagick

and get the following error:

Cant install RMagick 2.13.2. Cant find Magick-config in /usr/local/bundle/bin:/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin

Now, that's probably because the imagemagic package is missing on the OS, even though I specified it in my Dockerfile. So I guess the bundle install command is issued before my RUN apt-get command is issued.
My question - using this base image, is there a way to ensure imagemagic is installed prior to bundling?
Do I need to fork and change the base image Dockerfile to achieve that?

解决方案

you are right, the ONBUILD instructions from the rails:onbuild image will be executed just after the FROM instruction of your Dockerfile.

What I suggest is to change your Dockerfile as follow:

FROM ruby:2.2.0
RUN apt-get install imagemagick

# throw errors if Gemfile has been modified since Gemfile.lock
RUN bundle config --global frozen 1

RUN mkdir -p /usr/src/app
WORKDIR /usr/src/app

RUN apt-get update && apt-get install -y nodejs --no-install-recommends && rm -rf /var/lib/apt/lists/*
RUN apt-get update && apt-get install -y mysql-client postgresql-client sqlite3 --no-install-recommends && rm -rf /var/lib/apt/lists/*


COPY Gemfile /usr/src/app/
COPY Gemfile.lock /usr/src/app/
RUN bundle install

COPY . /usr/src/app

EXPOSE 3000
CMD ["rails", "server"]

which I made based on the rails:onbuild Dockerfile moving down the ONBUILD instructions and removing the ONBUILD flavor.

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