如何使用Dockerfile文件运行软件包安装
我想用docker来部署一个rails应用程序。 我跟着官方教程来做：
https://docs.docker.com/compose/rails/
但似乎我不幸运。
我的Dockerfile
FROM ruby:2.2.2 RUN apt-get update -qq && apt-get install -y build-essential # for mysql RUN apt-get install -y mysql-client libmysqlclient-dev # for a JS runtime RUN apt-get install -y nodejs ENV APP_HOME /myapp RUN mkdir $APP_HOME WORKDIR $APP_HOME ADD Gemfile $APP_HOME/Gemfile ADD Gemfile.lock $APP_HOME/Gemfile.lock RUN bundle install ADD . $APP_HOME 我的docker-compose.yml
db: image: mysql ports: - "3306:3306" web: build: . command: bundle exec rails s -p 3000 -b '0.0.0.0' volumes: - .:/myapp ports: - "3000:3000" links: - db
运行docker-compose build ，显示：
... Fetching git://github.com/guard/guard-test.git /usr/local/bundle/gems/bundler-1.10.6/lib/bundler/ui/shell.rb:94:in `[]': invalid byte sequence in US-ASCII (ArgumentError) from /usr/local/bundle/gems/bundler-1.10.6/lib/bundler/ui/shell.rb:94:in `strip_leading_spaces' from /usr/local/bundle/gems/bundler-1.10.6/lib/bundler/ui/shell.rb:99:in `word_wrap' from /usr/local/bundle/gems/bundler-1.10.6/lib/bundler/ui/shell.rb:85:in `tell_me' from /usr/local/bundle/gems/bundler-1.10.6/lib/bundler/ui/shell.rb:31:in `error' from /usr/local/bundle/gems/bundler-1.10.6/lib/bundler/friendly_errors.rb:12:in `rescue in with_friendly_errors' from /usr/local/bundle/gems/bundler-1.10.6/lib/bundler/friendly_errors.rb:7:in `with_friendly_errors' from /usr/local/bundle/gems/bundler-1.10.6/bin/bundle:18:in `<top (required)>' from /usr/local/bundle/bin/bundle:23:in `load' from /usr/local/bundle/bin/bundle:23:in `<main>' ERROR: Service 'web' failed to build: The command '/bin/sh -c bundle install' returned a non-zero code: 1
怎么了？
查看US-ASCII（ArgumentError）中的“ bundle install error”无效字节序列中的类似错误“ ”，一个选项是广告到Dockerfile：
export LANG=C.UTF-8
看到这个Dockerfile例如。
# Install required packages # LANG=C.UTF-8 line is needed for ondrej/php5 repository RUN \ export LANG=C.UTF-8 && \ ...