1. 获取ip、cpu、内存信息

ip使用ifconfig获得

localip=$(ifconfig eth0 | grep 'inet addr' | awk '{print $2}' | cut -f2 -d:)

空闲cpu由mpstat获得

cpuidle=$(mpstat | grep all | awk '{print $11}')

内存使用情况由free获得

freemem=$(free | grep Mem | awk '{print $4}')

totalmem=$(free | grep Mem | awk '{print $2}')

pcent=$(free | grep Mem | awk '{print $4/$2}')

. /etc/profile
AlertPcent=0.1
AlertCpu=10
msg=
Subject='服务器超载警报'

mailto(){
    /application/search/sendmail.py ''$Subject'' ''$msg''
}

localip=$(/sbin/ifconfig eth0 | grep 'inet addr' | awk '{print $2}' | cut -f2 -d:)
cpuidle=$(mpstat | grep all | awk '{print $11}')
freemem=$(free | grep Mem | awk '{print $4}')
totalmem=$(free | grep Mem | awk '{print $2}')
pcent=$(free | grep Mem | awk '{print $4/$2}')
#echo $localip
#echo '空闲cpu:'$cpuidle
#echo '空闲内存:'$freemem
#echo '总内存:'$totalmem
#echo '空闲内存比:'$pcent

if [ $(echo "$pcent <= $AlertPcent"|bc) = 1 -o $(echo "$cpuidle <= $AlertCpu"|bc) = 1 ]; then
    msg=''$localip':cpu空闲时间为'$cpuidle'%,可用内存剩余'$freemem',总内存为'$totalmem',剩余内存占比'$pcent'，低于10%'
    date
    echo $msg
    mailto
else
    echo '系统运行正常'
fi

2. 空闲cpu小于cpu报警阈值或空闲内存比例低于内存报警阈值时发送邮件报警

#! /usr/bin/env python
import smtplib 
import sys
from email.mime.text import MIMEText 
 
mailto_list=[""] 
 
mail_host = "smtp.126.com" 
mail_user = "monitor_algo" 
mail_pass = "" 
mail_postfix="126.com" 
 
def send_mail(to_list, sub, context): 
    me = mail_user + "<"+mail_user+"@"+mail_postfix+">" 
    msg = MIMEText(context) 
    msg['Subject'] = sub 
    msg['From'] = me 
    msg['To'] = ";".join(to_list) 
    try: 
        send_smtp = smtplib.SMTP() 
        send_smtp.connect(mail_host) 
        send_smtp.login(mail_user, mail_pass) 
        send_smtp.sendmail(me, to_list, msg.as_string()) 
        send_smtp.close() 
        return True 
    except (Exception, e): 
        print(str(e)) 
        return False 

if __name__=="__main__":
#    print ("start") 
#    for a in range(1, len(sys.argv)):
#        print sys.argv[a]
    if (True == send_mail(mailto_list,sys.argv[1],sys.argv[2])): 
	pass
#        print ("sucess")
    else: 
	pass
#        print ("failed") 

注意一点，crontan中的环境变量与用户环境的环境变量不一样，因其不会从缺省的用户profile文件中读入环境变量参数，最简单的方法是用source命令（.）

*/1 * * * * . /etc/profile; sh /application/search/monitor.sh >> /application/search/monitor.log