大神求助！！！redhat6.4使用centOS的yum源 安装出错

[qq_27623567]

[b][root@localhost 下载]# yum makecache
找不到配置文件 /etc/yum/pluginconf.d/product-id.conf
找不到插件 product-id 的配置文件
找不到配置文件 /etc/yum/pluginconf.d/subscription-manager.conf
找不到插件 subscription-manager 的配置文件
已加载插件：fastestmirror
Repository base is listed more than once in the configuration
Repository extras is listed more than once in the configuration
Loading mirror speeds from cached hostfile
错误：Cannot retrieve metalink for repository: epel. Please verify its path and try again