How the shell monitors cpu,memory,load average

Shell monitor Cpu,memory,load average, log to log, when load pressure, email notify admin.

Principle:

1. Get the value of the Cpu,memory,load average

2. Determine whether the value exceeds the scope of the customization, for example (Cpu>90%,memory<10%,load average>2)

3. The value exceeds the range, send email to notify the administrator. There is a time interval for sending, which is sent only once per hour.

4. Writes a value to log.

5. Set Crontab to run every 30 seconds.

Back to the column page: http://www.bianceng.cnhttp://www.bianceng.cn/Programming/extra/

servermonitor.sh

#!/bin/bash # System monitoring, recording CPU, memory, load average, when more than the specified value email notification Administrator # * * * Config start * * Current directory path root=$ (CD "$ (dirname" $) "; pwd) # Current server name host=$ (hostname) # log file path cpu_log= ' ${ROOT}/LOGS/CPU.L   
      
OG "mem_log=" ${root}/logs/mem.log "load_log=" ${root}/logs/load.log "# notify Email list notice_email= ' admin@admin.com ' # Cpu,memory,load average record last send notification email time cpu_remark= '/tmp/servermonitor_cpu.remark ' mem_remark= '/tmp/servermo Nitor_mem.remark ' load_remark= '/tmp/servermonitor_loadaverage.remark ' # notification email interval time remark_expire=3600 NOW=$ (  
    Date +%s) # * * * * * * * * * * * * * * * * * * * * * * * * Function start # Get CPU usage function getcpu  cpufree=$ (vmstat 1 5 |sed-n ' 3, $p ' |awk ' {x = x + $} end {print X/5} ' |awk-f. ' {print} ') cpuused=$ (100 -$cpufree)) Echo $cpuused Local remark remark=$ (Getremark ${cpu_remark}) # Check CPU usage is more than 90% if ["$remArk "=" "] && [" $cpuused "-GT 90]; Then echo "Subject: ${host} CPU uses more than 90% $ (date +%y-%m-%d ' '%h:%m:%s ')" | SendMail ${notice_email} echo "$ (date +%s)" > "$CPU _remark" fi} # Get memory usage function getme M () {mem=$ (free-m | sed-n ' 3,3p ') used=$ (echo $mem | awk-f ' ' {print $} ') free=$ (echo $mem | awk  
      
    -F ' ' {print $} ') total=$ (($used + $free)) limit=$ (($total/10)) echo "${total} ${used} ${free}" Local remark remark=$ (Getremark ${mem_remark}) # Check that the memory footprint exceeds the 90% if [' $remark ' = '] ;& ["$limit"-GT "$free"]; Then echo "Subject: ${host} Memory uses than more 90% $ (date +%y-%m-%d ' '%h:%m:%s ')" |  SendMail ${notice_email} Echo ' $ (date +%s) ' > ' $MEM _remark ' fi} # Get load Average function Getload () {load=$ (uptime | awk-f ' Load average: ' {print $} ') m1=$ (echo $load | awk-f ', ' {print $} ')  
    m5=$ (echo $load | awk-f ', ' {print $} ') m15=$ (echo $load | awk-f ', ' {print $} ') echo "${m1} ${ M5} ${m15} "m1u=$ (echo $m 1 | awk-f '. ') ' {print '} ') local remark remark=$ (Getremark ${load_remark}) # Check to see if the load has pressure if [$r Emark "=" "] && [" $m 1u "-GT" 2 "]; Then echo "Subject: ${host} Load Average more than 2 $ (date +%y-%m-%d ' '%h:%m:%s ')" | SendMail ${notice_email} echo "$ (date +%s)" > "$LOAD _remark ' fi} # get last email time function G  
      
        Etremark () {Local remark if [-f ' $] && [-S ' $]; then remark=$ (cat $) If [$ ($NOW-$remark))-gt "$REMARK _expire"];  Then rm-f $ remark= "" fi Else Remark= "" Fi Echo  
      
$remark} # * * * Function End * * * * cpuinfo=$ (GETCPU) meminfo=$ (GETMEM) loadinfo=$ (getload) Echo"CPU: ${cpuinfo}" >> "${cpu_log}" echo "Mem: ${meminfo}" >> "${mem_log}" echo "Load: ${loadinfo}" >> "${load_log}" Exit 0

Crontab

* * * * * * * * */home/xxxx/servermonitor.sh * * * * * * * * * * * *  
/home/xxxx/servermonitor.sh

Author: csdn blog proud Snow star Maple