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xbuild を使って AWS Elastic Beanstalk で任意のバージョンの Ruby を利用する方法

Last updated at Posted at 2014-03-06

カスタムAMIを使わずに .ruby-version を見て、バージョンを切り替える秘伝のタレ的な、.ebextensions を発明した。以下の様な設定ファイルを .ebextensions 配下に作って、デプロイするだけで良い。
とりあえず、2014/3/6 現在はこれで動く。ついでに、Rubyのビルドの高速化とgitからbundle installした場合にPassengerがgemを認識しない問題の修正も入っている。

xbuild を使っているので、perl、python, php, node, ruby の全てに応用できるはず。t1.micro インスタンスだと起動に30分くらいかかるけど、そこは初回だけなんで我慢しよう。

option_settings:
  - namespace: aws:elasticbeanstalk:application:environment
    option_name: NOKOGIRI_USE_SYSTEM_LIBRARIES
    value: yes
  - namespace: aws:elasticbeanstalk:application:environment
    option_name: DEFAULT_RUBY_VERSION
    value: 2.1.0

packages:
  yum:
    git: []

files:
  /opt/elasticbeanstalk/hooks/appdeploy/pre/05_install_ruby.sh:
    mode: "000755"
    user: root
    group: root
    encoding: plain
    content: |
      #!/usr/bin/env bash
      ORG_PATH=$PATH
      . /opt/elasticbeanstalk/support/envvars
      cd $EB_CONFIG_APP_ONDECK
      export RUBY_VERSION=$DEFAULT_RUBY_VERSION
      if [ -f .ruby-version ]; then
        export RUBY_VERSION=`cat .ruby-version`
      fi
      echo "use ruby ${RUBY_VERSION}"
      export RUBY_PATH=/usr/local/bin/ruby-${RUBY_VERSION}
      if [ ! -e $RUBY_PATH/bin/ruby ]; then
        echo "install ruby-${RUBY_VERSION} start"
        CONFIGURE_OPTS='--disable-install-rdoc' /usr/local/bin/xbuild/ruby-install ${RUBY_VERSION} ${RUBY_PATH}
        if [ $? != 0 ]; then
          echo "ERROR: install ruby ${RUBY_VERSION} failed!"
          exit 1
        else
          echo "install ruby ${RUBY_VERSION} succeeded"
        fi
      fi
      ${RUBY_PATH}/bin/gem install bundler --no-ri --no-rdoc
      ${RUBY_PATH}/bin/gem install passenger --no-ri --no-rdoc
      export PATH=${RUBY_PATH}/bin:$ORG_PATH
      echo "export PATH=${PATH}" > /opt/elasticbeanstalk/support/envvars.d/appenv
      true

  /opt/elasticbeanstalk/hooks/appdeploy/pre/10_bundle_install.sh:
    #!/usr/bin/env bash
    . /opt/elasticbeanstalk/support/envvars
    cd $EB_CONFIG_APP_ONDECK
    if [ -f Gemfile ]; then
      echo "running 'bundle install' with Gemfile:"
      cat Gemfile
      bundle install --deployment
      if [ $? != 0 ]; then
        echo "ERROR: bundle install failed!"
        exit 1
      else
        echo "bundle install succeeded"
      fi
    else
      echo "no Gemfile found! Skipping bundle install stage!"
    fi
    if [ -f Gemfile.lock ]; then
      echo "encountered a Gemfile.lock, setting proper permissions"
      chown $EB_CONFIG_APP_USER:$EB_CONFIG_APP_USER Gemfile.lock
    else
      echo "no Gemfile.lock file found, so no permissions to set on it"
    fi
    true

commands:
  01_clone_xbuild:
    command: git clone https://github.com/tagomoris/xbuild.git
    cwd: /usr/local/bin
    ignoreErrors: true

container_commands:
  01_force_restart_passenger:
    command: /etc/init.d/passenger restart
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