Shulou(Shulou.com)06/01 Report--

This article mainly shows you "how to achieve a shell script that can monitor system resources". The content is simple and clear. I hope it can help you solve your doubts. Let me lead you to study and learn "how to implement a shell script that can monitor system resources".

[root@AR log] # cat monitor

#! / bin/bash

# System Monitoring Script

While [1]

Do

# postfix or sendmail service needs to be enabled on this machine.

# alarm email address setting

MAILFROM=monitor@zhaoyun.com

MAILTO=zhaoyun006@163.com

# set the interval between script runs. Unit (seconds).

RUNTIME=1

# memory usage monitoring settings (%)

MEMTHRE=90

# Traffic Monitoring Settings

# Network card to be monitored

ETHX=eth0

# enter the number of MB greater than the number to send an alarm, unit (MB)

INFLOWTHREMB=50

OUTFLOWTHREMB=50

# enter the number of KB greater than the number to send an alarm, unit (KB)

INFLOWTHREKB=500

OUTFLOWTHREKB=500

# TCP connection status quantity monitoring settings

# enter the maximum number of connections

TIME_WAIT=10

FIN_WAIT1=20

FIN_WAIT2=20

ESTABLISHED=20

SYN_RECV=10

CLOSE_WAIT=10

CLOSING=10

LAST_ACK=10

# CPU usage Monitoring Settings

# enter the number of alarms sent when the cpu utilization rate is greater than (%)

CPUTHRE=5

# setting the size of hard disk usage

# fill in the occupancy rate of hard disk (%)

ROOT=80

VAR=100

USR=100

BOOT=80

# Debug mode switch. (YES/NO)

DBUG=NO

# Supervision and control script to hold the capacity of the line

#

Time= `date + "% Y-%m-%d% H:%M:%S" `

# memory Monitoring Section

NULL=/dev/null

MEM= `free-m | grep Mem | awk'{print $3max 2cm 100}'`

MEMB= `free-m | grep Mem | awk'{print $2 camera 4 minutes 6 minutes 7}'| awk'{print $1 minus 1 million 2}'| awk'{print $2 Universe 100}'`

# echo $MEM

# echo $MEMB

MA= `expr $MEM\ > $MEMTHRE `

If [$MA-eq 1]; then

Sendmail-t $INMBF

Echo `echo "scale=4;$OUTPUTMBA/1024" | bc`MB > $OUTMBF

INMB= `cat $INMBF | awk'{print $1}'`

OUTMB= `cat $OUTMBF | awk'{print $1}'`

If [$INPUTMBA-gt 1024]; then

If [$INMB-gt $INFLOWTHREMB]; then

Sendmail-t > $tcpfile

Fi

Grep FIN_WAIT2 $tcpfile > $NULL

If [$?-eq 1]; then

Echo "FIN_WAIT2 0" > > $tcpfile

Fi

Grep CLOSE_WAIT $tcpfile > $NULL

If [$?-eq 1]; then

Echo "CLOSE_WAIT 0" > > $tcpfile

Fi

Grep LAST_ACK $tcpfile > $NULL

If [$?-eq 1]; then

Echo "LAST_ACK 0" > > $tcpfile

Fi

Grep SYN_RECV $tcpfile > $NULL

If [$?-eq 1]; then

Echo "SYN_RECV 0" > > $tcpfile

Fi

Grep CLOSING $tcpfile > $NULL

If [$?-eq 1]; then

Echo "CLOSING 0" > > $tcpfile

Fi

Grep ESTABLISHED $tcpfile > $NULL

If [$?-eq 1]; then

Echo "ESTABLISHED 0" > > $tcpfile

Fi

TIME_WAITV= `grep TIME_WAIT $tcpfile | awk'{print $2}'`

FIN_WAIT1V= `grep FIN_WAIT1 $tcpfile | awk'{print $2}'`

FIN_WAIT2V= `grep FIN_WAIT2 $tcpfile | awk'{print $2}'`

ESTABLISHEDV= `grep ESTABLISHED $tcpfile | awk'{print $2}'`

SYN_RECVV= `grep SYN_RECV $tcpfile | awk'{print $2}'`

CLOSINGV= `grep CLOSING $tcpfile | awk'{print $2}'`

CLOSE_WAITV= `grep CLOSE_WAIT $tcpfile | awk'{print $2}'`

LAST_ACKV= `grep LAST_ACK $tcpfile | awk'{print $2}'`

If [$ESTABLISHEDV-gt $ESTABLISHED]; then

Sendmail-t

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