1.ab运行需要依赖apr-util包

yum install apr-util

2.需要yumdownload命令下载

yum install yum-utils

3.新建一个目录，下载解压，复制到系统bin下

mkdir /data/ab
cd /data/ab
yum install yum-utils.noarch
yumdownloader httpd-tools*
cp /data/ab/usr/bin/ab /usr/bin

4.可以愉快玩耍了

ab -V
This is ApacheBench, Version 2.3 <$Revision: 1430300 $>
Copyright 1996 Adam Twiss, Zeus Technology Ltd, http://www.zeustech.net/
Licensed to The Apache Software Foundation, http://www.apache.org/

参考1
参考2