安装keystone组件出错

yum install gcc gcc-c++ make libtool patch automake libxslt-devel kernel-devel libudev-devel git wget
Loaded plugins: fastestmirror, refresh-packagekit, security
Loading mirror speeds from cached hostfile
Error: Cannot retrieve metalink for repository: epel. Please verify its path and try again
这个缺少库吗?怎么解决?

找不到对应的安装包,服务器上没有,或者你不能访问。