Uncategorized

Tracking centos server with bash script

Rate this post

In this article I will show you how to use bash shell to test the system periodically, to check the connection port 80, server load, queue exim, and mysql process … The script will automatically notify you via email if there are anything unusual.

Script will use a while loop to run every 2 minutes and check whether the case is running on the server. To run periodically, you can use command : crontab or screen

Note:

In this tutorial I will use screen on CentOS 6 (x64):

1. Install screen

Tools screen will help you to run multiple sessions on a terminal session and keep it alive unless you cancel or restart the server.
This utility is most effective when you want to install a program, and take the time that you are connecting to a remote ssh.

– To install screen you just use yum command:

# yum install screen -y

– To create a new session you use the command :screen -S Name_sesion_or_jobs

# screen -S monitor

– To exit the current screen, and work continues:
Press Ctr + A + D

– To list the session created by the screen:

You should see
[root@Mysql02 ~]# screen -ls
There are screens on:
29823.mysql_moniter     (Detached)
21871.pts-0.Mysql02     (Attached)
2 Sockets in /var/run/screen/S-root.

2. Run script on screen

– You create a file (moniter.sh) with the code below : (don’t forget to set your email address below “### Send mail alert and attachments log file” line near the end of the file.

#!/bin/bash
## Moniter server v1 http://www.namhuy.net
pass="namhuy"
server=`uname -a|awk {'print $2'}`
ps_view=`ps -eo pmem,pcpu,vsize,pid,cmd | sort -k 1 -nr | head -5`
ps_view2=`ps -eo pmem,pcpu,vsize,pid,cmd | sort -k 1 -nr | head -5`
echo -n "Password: "
read -s password
clear
echo "Server Moniter"
if [ $password != $pass ] ; then
echo "Wrong password"
exit
else

### File Logs
log="log2.txt"
num_load=1
while true
do
echo "### Load $num_load ####" >> $log
num_load=$(($num_load+1))
echo -n "**** load: " >> $log
load1=`w|grep load`

### Tracking number php process
num_php=`ps aux|grep php|grep -v root|wc -l`
w|grep load >> $log
echo "**** Process php" >> $log
echo  "**** Nummber process php: $num_php" >> $log
ps aux|grep php|grep -v root >> $log

### Print top process
echo  "**** Top Process: $ps_view" >> $log

### Print number connect port 80
echo -n "***** Connect Port 80:" >> $log
netstat -an|grep :80|wc -l >> $log

### Print top 5 IP connect port 80
echo "***** Top 5 Ip" >> $log
netstat -an|grep :80 |awk '{print $5}'|cut -d":" -f1|sort|uniq -c|sort -n|tail -n 5 >> $log
i=`w|grep load|sed s/average:/*/|cut -d*  -f2|cut -c1-3| sed -e 's/\.//g'` ## Number the current load of server
load=10 # Default load, if the server load is greater than (10), the script will send mail alerts.
if [ $i -lt $load ]; then
echo "**** Load  $i" >> $log
echo "**** ok" >> $log
else
echo "*** Load $i" >> $log
echo "**** Not oke" >> $log
echo  "**** Top Process: $ps_view" >> $log
echo  "**** Top Process: $ps_view2" >> $log

Send mail alert and attachments log file
echo "**** $load1 - Load Current: $i"|mail -s "$server" your_email@yahoo.com < $log ### Conducting the service startup if you want service httpd restart service mysql restart echo "*** Service restarted" >> $log
fi
echo "-------------------" >> $log
## will check every 2 minute
sleep 120
done
fi

– Set execute permissions(only run via root):

# chmod 0700 moniter.sh

– Create a new session with the moniter name:

# screen -S moniter

– At the command prompt, run the script with password: namhuy

# ./moniter.sh

You should see

[root @ Mysql02 ~] #./moniter.sh
Password:

– You can view logs at: log2.txt in your email if your server load is greater than 10

 

 

Related Articles

Leave a Reply

avatar
Photo and Image Files
 
 
 
Audio and Video Files
 
 
 
Other File Types
 
 
 

This site uses Akismet to reduce spam. Learn how your comment data is processed.

  Subscribe  
Notify of
Back to top button
Close

Send this to a friend