gem

#查看gem源

gem sources

# 删除默认的gem源

gem sources --remove http://rubygems.org/

# 增加taobao作为gem源

gem sources -a http://ruby.taobao.org/

# 查看当前的gem源

gem sources

*** CURRENT SOURCES ***

http://ruby.taobao.org

# 请确保只有 ruby.taobao.org

# 清空源缓存

gem sources -c

# 更新源缓存

gem sources -u