gem install bundle 安装失败

在进行安装bundle时，会出现如下的错误。

# 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)

这种情况，是被墙了。
需要替换了，如下：

# 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