Common Shell scripts for host monitoring

Recently, some people have asked me questions about server monitoring from time to time. I asked if common server monitoring software, such as cacti and nagios, can I write shell scripts by myself? The shell scripts written based on your needs can better meet your needs and refine the comprehensiveness of host monitoring.

The following are some of my commonly used host monitoring scripts. You can modify them based on your situation and hope to help you.

1. View host Nic traffic

 
 

  
  
#!/bin/bash 
  
  
#!/bin/bash 
  
  
#network 
  
  
#Mike.Xu 
  
  
while : ; do 
  
  
time='date +%m"-"%d" "%k":"%M' 
  
  
day='date +%m"-"%d' 
  
  
rx_before='ifconfig eth0|sed -n "8"p|awk '{print $2}'|cut -c7-' 
  
  
tx_before='ifconfig eth0|sed -n "8"p|awk '{print $6}'|cut -c7-' 
  
  
sleep 2 
  
  
rx_after='ifconfig eth0|sed -n "8"p|awk '{print $2}'|cut -c7-' 
  
  
tx_after='ifconfig eth0|sed -n "8"p|awk '{print $6}'|cut -c7-' 
  
  
rx_result=$[(rx_after-rx_before)/256] 
  
  
tx_result=$[(tx_after-tx_before)/256] 
  
  
echo "$time Now_In_Speed: "$rx_result"kbps Now_OUt_Speed: "$tx_result"kbps" 
  
  
sleep 2 
  
  
done 
  
  
done 
 
 

2. system status monitoring

 
 

  
  
#!/bin/sh 
  
  
#systemstat.sh 
  
  
#Mike.Xu 
  
  
IP=192.168.1.227 
  
  
top -n 2| grep "Cpu" >>./temp/cpu.txt 
  
  
free -m | grep "Mem" >> ./temp/mem.txt 
  
  
df -k | grep "sda1" >> ./temp/drive_sda1.txt 
  
  
#df -k | grep sda2 >> ./temp/drive_sda2.txt 
  
  
df -k | grep "/mnt/storage_0" >> ./temp/mnt_storage_0.txt 
  
  
df -k | grep "/mnt/storage_pic" >> ./temp/mnt_storage_pic.txt 
  
  
time=`date +%m"."%d" "%k":"%M` 
  
  
connect=`netstat -na | grep "219.238.148.30:80" | wc -l` 
  
  
echo "$time  $connect" >> ./temp/connect_count.txt 
 
 

3. Monitor the disk space of the host. If the disk space exceeds 90%, send a mail to send a warning.

 
 

  
  
#!/bin/bash 
  
  
#monitor available disk space 
  
  
SPACE='df | sed -n '/ \ / $ / p' | gawk '{print $5}' | sed  's/%//' 
  
  
if [ $SPACE -ge 90 ] 
  
  
then 
  
  
fty89@163.com 
  
  
fi 
 
 

4. Monitor CPU and memory usage

 
 

  
  
#!/bin/bash 
  
  
#script  to capture system statistics 
  
  
OUTFILE=/home/xu/capstats.csv 
  
  
DATE='date +%m/%d/%Y' 
  
  
TIME='date +%k:%m:%s' 
  
  
TIMEOUT='uptime' 
  
  
VMOUT='vmstat 1 2' 
  
  
USERS='echo $TIMEOUT | gawk '{print $4}' ' 
  
  
LOAD='echo $TIMEOUT | gawk '{print $9}' | sed "s/,//' ' 
  
  
FREE='echo $VMOUT | sed -n '/[0-9]/p' | sed -n '2p' | gawk '{print $4} ' ' 
  
  
IDLE='echo  $VMOUT | sed -n '/[0-9]/p' | sed -n '2p' |gawk '{print $15}' ' 
  
  
echo "$DATE,$TIME,$USERS,$LOAD,$FREE,$IDLE" >> $OUTFILE 
 
 

5. Comprehensive host monitoring

 
 

  
  
#!/bin/bash 
  
  
# check_xu.sh 
  
  
# 0 * * * * /home/check_xu.sh 
  
  
DAT="`date +%Y%m%d`" 
  
  
HOUR="`date +%H`" 
  
  
DIR="/home/oslog/host_${DAT}/${HOUR}" 
  
  
DELAY=60 
  
  
COUNT=60 
  
  
# whether the responsible directory exist 
  
  
if ! test -d ${DIR} 
  
  
then 
  
  
/bin/mkdir -p ${DIR} 
  
  
fi 
  
  
# general check 
  
  
export TERM=linux 
  
  
/usr/bin/top -b -d ${DELAY} -n ${COUNT} > ${DIR}/top_${DAT}.log 2>&1 & 
  
  
# cpu check 
  
  
/usr/bin/sar -u ${DELAY} ${COUNT} > ${DIR}/cpu_${DAT}.log 2>&1 & 
  
  
#/usr/bin/mpstat -P 0 ${DELAY} ${COUNT} > ${DIR}/cpu_0_${DAT}.log 2>&1 & 
  
  
#/usr/bin/mpstat -P 1 ${DELAY} ${COUNT} > ${DIR}/cpu_1_${DAT}.log 2>&1 & 
  
  
# memory check 
  
  
/usr/bin/vmstat ${DELAY} ${COUNT} > ${DIR}/vmstat_${DAT}.log 2>&1 & 
  
  
# I/O check 
  
  
/usr/bin/iostat ${DELAY} ${COUNT} > ${DIR}/iostat_${DAT}.log 2>&1 & 
  
  
# network check 
  
  
/usr/bin/sar -n DEV ${DELAY} ${COUNT} > ${DIR}/net_${DAT}.log 2>&1 & 
  
  
#/usr/bin/sar -n EDEV ${DELAY} ${COUNT} > ${DIR}/net_edev_${DAT}.log 2>&1 & 
 
 

In crontab, automatic execution is performed hourly:

 
 

  
  
0 * * * * /home/check_xu.sh 
 
 

The cpu, memory, network, and IO statistics of each hour are generated in the/home/oslog/host_yyyymmdd/hh directory.

If a problem occurs in a certain period of time, you can view the corresponding log information to see how the host performance was at that time.