Get Notification On server load & restart Apache2
A simple Shell Script That will send you email notification on a specific load average of your server.. & also will restart any services you want.
In my case i am restating the apache2 if the system load reaches 30.
So Lets create the script..
*** create a File like apache2_restart.sh ***
& copy the below code to the file.
#!/bin/sh
tsleep=2 # time to wait before 2 checks
llimit=30 # load limit before action
[email protected] #put your monitor alert email here
host=`hostname -f`
load=`cat /proc/loadavg |awk {'print $1'}|cut -d "." -f1` # The load average now
sleep $tsleep
load2=`cat /proc/loadavg |awk {'print $1'}|cut -d "." -f1` # The load average after tsleep
apache_init='/etc/init.d/apache2';
if test "$load" -ge $llimit
then
if test "$load2" -ge $load
then
$apache_init restart
date=`date`
echo "The Load Average has reached $load1 and $load2 on $host" | mail -s "$host : High Load Average Alert" $alert
echo "$date : The Load Average has reached $load1 and $load2 on $host" >> /var/log/loadavg.log
else
echo "ok" 1>&2
fi
else
sleep 1
fi
Now Make the shell script Executable
sudo chmod +x myShell
One last step add a cronjob to run the shell script
crontab -e
& paste the following line at the end of the file
*/5 * * * * /path/to/your/scrip.sh >/dev/null 2>&1