安装zabbix的时候报如下的错误,安装附件的包，可以解决以下报错问题。
Error Downloading Packages:
libevent-devel-1.4.13-4.el6.x86_64: failure: Packages/libevent-devel-1.4.13-4.el6.x86_64.rpm from c6-media: [Errno 256] No more mirrors to try.
libevent-headers-1.4.13-4.el6.noarch: failure: Packages/libevent-headers-1.4.13-4.el6.noarch.rpm from c6-media: [Errno 256] No more mirrors to try.
libevent-doc-1.4.13-4.el6.noarch: failure: Packages/libevent-doc-1.4.13-4.el6.noarch.rpm from c6-media: [Errno 256] No more mirrors to try.
