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当服务器带宽占用情况不明的时候，或者有卡顿找不到原因的时候，可以从网络带宽占满考虑问题。
操作环境 Centos7
使用命令： iftop 和 lsof
操作方法
这里使用iftop来查看各进程的网络速率情况
1.系统默认是没有安装iftop的，需要先安装iftop，在安装iftop之前最好更新下epel repo
yum -y install epel-release
yum makecache
yum -y install iftop
2.使用iftop -PB来监控各进程网络速率情况，可以查看各端口的网络速率情况，可以看见21931端口占用速率最大为598KB/s
iftop -PB
3.查看21931端口是哪个进程
通过lsof来查看网络端口的进程，可以查看到21931端口是java的进程。
lsof -i :21931
COMMAND PID USER FD TYPE DEVICE SIZE/OFF NODE NAME
java 25762 cloudera-scm 239u IPv4 224786 0t0 TCP centos7-mysql-196:48774->184.101.0.167:https (ESTABLISHED)4.这个时候，如果一些进程是非法进程，或者是无用的，那就可以将其kill掉。
kill -9 25762 版权属于: 三三世界-百宝箱
本文链接: http://www.33f.net/linux/centos_check_network_usage.html
本文最后更新于2022年05月14日 ，已超过735天没有更新，若内容或图片失效，请留言反馈。
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@ 权限问题，试试sudo 再加命令。
你好提示Permission denied 怎么办啊