1.epel安装

rpm -Uvh http://www.landui.com/fedora/epel/6/x86_64/epel-release-6-8.noarch.rpm

rpm -Uvh http://www.landui.com/enterprise/remi-release-6.rpm

2.查看是否安装成功

rpm -q epel-release

[root@node02 ~]# rpm -q epel-release

epel-release-6-8.noarch

3.导入key：

rpm --import /etc/pki/rpm-gpg/RPM-GPG-KEY-EPEL-6

4：重建缓存

yum makecache

5：验证安装是否成功（yum安装iftop工具）

yum install -y iftop