Elastic Beanstalk容器命令：获取ruby依赖项错误

Question

我是aws的新手，正在学习如何编写容器命令。 我在这里找到了一个很好的链接：结合使用PHP和Private Composer存储库来使用AWS Elastic Beanstalk

一切从一开始就起作用。 但是后来，我的弹性束开始散发出这个错误

Command failed on instance. Return code: 1 Output: Error occurred during build: Defaults script for command 11-move-priv-key failed .

我正在检查我的cfn-init.log，并且显示

2014-04-24 17:16:33,577 [DEBUG] Running command 11-move-priv-key
2014-04-24 17:16:33,578 [DEBUG] Generating defaults for command 11-move-priv-key
2014-04-24 17:16:33,595 [DEBUG] Defaults script for 11-move-priv-key output: 
2014-04-24 17:16:33,596 [ERROR] Defaults script failed for 11-move-priv-key: /opt/elasticbeanstalk/support/cfncontext.rb:3:in `require': no such file to load -- rubygems (LoadError)
    from /opt/elasticbeanstalk/support/cfncontext.rb:3:in `require': no such file to load -- rubygems (LoadError)
    from /opt/elasticbeanstalk/support/cfncontext.rb:3

因此，没有安装rubygems，而是运行yum install ruby​​gems

然后，它说未安装用于ruby的json，我决定运行gem install json，然后我得到了

Building native extensions.  This could take a while...
ERROR:  Error installing json:
    ERROR: Failed to build gem native extension.

    /usr/bin/ruby1.8 extconf.rb
mkmf.rb can't find header files for ruby at /usr/lib/ruby/ruby.h

我是AWS的新手，以前从未使用过红宝石。 所以，我有点困惑。

首先，为什么它以前可以工作并且停止工作？ 是否有我不小心更改的设置？

其次，如何修复json安装...

提前致谢！

贾斯汀