常用的源
gem sources -a
http://rubygems.org/
gem sources -a http://gems.github.com
gem sources -a http://gems.rubyforge.org
gem sources -a http://ruby.taobao.org
// 国内应该找个比较靠谱了,适合安装大多数常见的gem
pod
repo remove master
pod
repo add master http://git.oschina.net/akuandev/Specs.git
pod
repo update
pod
install --no-repo-update
pod
update --no-repo-update