Shell monitoring Cpu,memory,load Average

The shell monitors cpu,memory,load average, logs to log, and notifies the administrator when the load is under pressure.

Implementation principle:

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

2. Determine if the value exceeds the custom range, for example (Cpu>90%,memory<10%,load average>2)

3. If the value exceeds the range, send an email to notify the administrator. It is sent at a time interval and is sent only once per hour.

4. Write the value to log.

5. Set the crontab to run every 30 seconds.

#!/bin/bash

# system monitoring, recording CPU, memory, load average, email notification Manager when exceeding the specified value

# * * * Config start * * *

# Current directory path

root=$ (CD "$ (dirname") "; pwd)

# Current server name

host=$ (hostname)

# log file path

Cpu_log= "${root}/logs/cpu.log"

Mem_log= "${root}/logs/mem.log"

Load_log= "${root}/logs/load.log"

# notification e-mail list

Notice_email= ' [EMAIL protected] '

# Cpu,memory,load average record last send notification email time

cpu_remark= '/tmp/servermonitor_cpu.remark '

mem_remark= '/tmp/servermonitor_mem.remark '

load_remark= '/tmp/servermonitor_loadaverage.remark '

# Send notification e-mail interval time

remark_expire=3600

now=$ (Date +%s)

# * * * Config END * * *

# * * * 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 if CPU usage exceeds 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 Getmem () {

mem=$ (free-m | sed-n ' 3,3p ')

used=$ (echo $mem | awk-f ' {print $} ')

free=$ (echo $mem | awk-f "{print $4} ')

total=$ (($used + $free))

limit=$ (($total/10))

echo "${total} ${used} ${free}"

Local remark

remark=$ (Getremark ${mem_remark})

# Check if memory consumption exceeds 90%

If ["$remark" = ""] && ["$limit"-GT "$free"]; Then

echo "Subject: ${host} Memory uses more than 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 if the load is under pressure

If ["$remark" = ""] && ["$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

}

# Gets the last time the email was sent

function Getremark () {

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

This article is from the "Andylinux" blog, make sure to keep this source http://andywen.blog.51cto.com/10283904/1792538

Shell monitoring Cpu,memory,load Average