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需要安装dnsperf对dns进行压力测试，yum install dnsperf始终找不到dnsperf安装包，更新aliyun,163的镜像依然找不到，最后在epel里找到安装包。

epel(RHEL 7)
wget -O /etc/yum.repos.d/epel.repo http://mirrors.aliyun.com/repo/epel-7.repo 

epel(RHEL 6)
wget -O /etc/yum.repos.d/epel.repo http://mirrors.aliyun.com/repo/epel-6.repo 

epel(RHEL 5)
wget -O /etc/yum.repos.d/epel.repo http://mirrors.aliyun.com/repo/epel-5.repo