gem install bundle 安裝失敗

1. 在進行安裝bundle時，會出現以下的錯誤。
   # gem install bundle
   ERROR: Could not find a valid gem ‘bundle’ (>= 0), here is why:
   Unable to download data from https://rubygems.org/ - Errno::ECONNRESET: Connection reset by peer - SSL_connect (https://rubygems.org/latest_specs.4.8.gz)

2. 這種狀況，是被牆了。

3. 須要替換了，以下：
   # gem sources --remove https://rubygems.org/
   https://rubygems.org/ removed from sources
   # gem sources -a http://ruby.taobao.org/
   Error fetching http://ruby.taobao.org/:
   bad response Not Found 404 (http://ruby.taobao.org/specs.4.8.gz)
   # gem sources -a https://ruby.taobao.org/
   source https://ruby.taobao.org/ already present in the cache
   # gem sources -l
   CURRENT SOURCES
   https://ruby.taobao.org/
   # gem install bundle Fetching: bundler-1.10.6.gem (100%) Successfully installed bundler-1.10.6