无法安装与docker的gem“rmagick”
我有这个Dockerfile
FROM ruby:2.1.5 RUN apt-get update -qq && apt-get install -y build-essential # for postgres RUN apt-get install -y libpq-dev # for nokogiri RUN apt-get install -y libxml2-dev libxslt1-dev # for capybara-webkit RUN apt-get install -y libqt4-webkit libqt4-dev xvfb # for a JS runtime RUN apt-get install -y nodejs # for rmagick RUN apt-get install -y imagemagick libmagickwand-dev ENV APP_HOME /lescollectionneurs RUN mkdir $APP_HOME WORKDIR $APP_HOME ADD Gemfile* $APP_HOME/ RUN bundle install ADD . $APP_HOME 而这个Gemfile：
source 'https://rubygems.org' ruby "2.1.5" gem "rmagick", require: 'RMagick'
当我用户docker build . ：
sudo docker build . Sending build context to Docker daemon 567.6 MB Sending build context to Docker daemon Step 0 : FROM ruby:2.1.5 ---> afba1b22768e Step 1 : RUN apt-get update -qq && apt-get install -y build-essential ---> Using cache ---> 542ba2520fd7 Step 2 : RUN apt-get install -y libpq-dev ---> Using cache ---> 242d31de9101 Step 3 : RUN apt-get install -y libxml2-dev libxslt1-dev ---> Using cache ---> 81fdba39c703 Step 4 : RUN apt-get install -y libqt4-webkit libqt4-dev xvfb ---> Using cache ---> e16c728f5879 Step 5 : RUN apt-get install -y nodejs ---> Using cache ---> 08a676ea038c Step 6 : RUN apt-get install -y imagemagick libmagickwand-dev ---> Using cache ---> f6911106ff8d Step 7 : ENV APP_HOME /lescollectionneurs ---> Using cache ---> d4740491742f Step 8 : RUN mkdir $APP_HOME ---> Using cache ---> f439a8295600 Step 9 : WORKDIR $APP_HOME ---> Using cache ---> 0ffdb5e33df1 Step 10 : ADD Gemfile* $APP_HOME/ ---> Using cache ---> 8867a3e40baf Step 11 : RUN bundle install ---> Running in fd98e604631d Don't run Bundler as root. Bundler can ask for sudo if it is needed, and installing your bundle as root will break this application for all non-root users on this machine. Fetching gem metadata from https://rubygems.org/.. Fetching version metadata from https://rubygems.org/. Resolving dependencies... Gem::Ext::BuildError: ERROR: Failed to build gem native extension. /usr/local/bin/ruby extconf.rb checking for Ruby version >= 1.8.5... yes checking for gcc... yes checking for Magick-config... no Can't install RMagick 2.13.2. Can't find Magick-config in /usr/local/bundle/bin:/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin *** extconf.rb failed *** Could not create Makefile due to some reason, probably lack of necessary libraries and/or headers. Check the mkmf.log file for more details. You may need configuration options. Provided configuration options: --with-opt-dir --without-opt-dir --with-opt-include --without-opt-include=${opt-dir}/include --with-opt-lib --without-opt-lib=${opt-dir}/lib --with-make-prog --without-make-prog --srcdir=. --curdir --ruby=/usr/local/bin/ruby extconf failed, exit code 1 Gem files will remain installed in /usr/local/bundle/gems/rmagick-2.13.2 for inspection. Results logged to /usr/local/bundle/extensions/x86_64-linux/2.1.0-static/rmagick-2.13.2/gem_make.out An error occurred while installing rmagick (2.13.2), and Bundler cannot continue. Make sure that `gem install rmagick -v '2.13.2'` succeeds before bundling. INFO[0014] The command [/bin/sh -c bundle install] returned a non-zero code: 5
它不工作，因为它找不到/ usr / bin /
当我运行sudo docker run -t -i lescollectionneurs /bin/bash ，我可以这样做：
root@4b015bacf80d:/# apt-get install -y imagemagick libmagickwand-dev #..... Installing successfully root@4b015bacf80d:/# /usr/bin/Magick Magick-config MagickCore-config MagickWand-config root@4b015bacf80d:/# /usr/bin/Magick-config Usage: Magick-config [--cflags] [--cppflags] [--exec-prefix] [--ldflags] [--libs] [--prefix] [--version] Example: gcc `Magick-config --cflags --cppflags` -o core core.c `Magick-config --ldflags --libs` root@4b015bacf80d:/# gem install rmagick Fetching: rmagick-2.15.0.gem (100%) Building native extensions. This could take a while... Successfully installed rmagick-2.15.0 Parsing documentation for rmagick-2.15.0 Installing ri documentation for rmagick-2.15.0 Done installing documentation for rmagick after 7 seconds 1 gem installed
正如你所看到的，我可以通过打开bash来安装imagemagick。 安装后，二进制文件可用，我可以安装rmagick。
为什么docke文件中的结果不一样？ 我如何使用Dockerfile安装rmagick？
我想你是缺lesslibmagickcore-dev，这将允许您成功地编译rmagick。 尝试以下操作：
RUN apt-get install imagemagick libmagickcore-dev libmagickwand-dev
gem版本2.13.4为我解决了这个问题。 https://github.com/docker-library/rails/issues/16#issuecomment-64514330