Linux VPS 通过 CPULimit 来限制CPU使用率

#debian/ubuntu 系统
apt install -y cpulimit

#RHEL/Centos/Fedora 系统
yum install epel-release cpulimit

cpulimit -h
Usage: cpulimit [OPTIONS...] TARGET
OPTIONS
-l, --limit=N percentage of cpu allowed from 0 to 100 (required)//cpu 限制的百分比
-v, --verbose show control statistics//显示版本号
-z, --lazy exit if there is no target process, or if it dies//如果限制的进程不存在了，则退出。
-i, --include-children limit also the children processes//包括子进程。
-h, --help display this help and exit //帮助，显示参数
TARGET must be exactly one of these:
-p, --pid=N pid of the process (implies -z) //进程的 pid
-e, --exe=FILE name of the executable program file or path name //可执行程序
COMMAND [ARGS] run this command and limit it (implies -z)

#限制 firefox 使用 30% cpu 利用率
cpulimit -e firefox -l 30

#限制进程号 1313 的程序使用 30%cpu 利用率
cpulimit -p 1313 -l 30

#限制绝对路径下该软件的 cpu 利用率
cpulimit -e /usr/local/nginx/sbin/nginx -l 50

#!/bin/bash

while true ; do

id=`ps -ef | grep cpulimit | grep -v "grep" | awk '{print $10}' | tail -1`

nid=`ps aux | awk '{ if ( $3 > 75 ) print $2 }' | head -1`

if [ "${nid}" != "" ] && [ "${nid}" != "${id}" ] ; then

    cpulimit -p ${nid} -l 75 &

    echo "[`date`] CpuLimiter run for ${nid} `ps -ef | grep ${nid} | awk '{print $8}' | head -1`" >> /root/cpulimit-log.log

fi

sleep 3

done