How to check serverload on a linux box

aamerjavaid · 01-17-2012, 08:10 AM

Hi,

We are currently working on a script which should check the Server load (CPU/Memory), if it hits threshold, please suggest tolls and techniques available on this.

Thanks,
Amir

PacMan? · 01-17-2012, 09:20 AM

Quote:

Originally Posted by aamerjavaid

Hi,

We are currently working on a script which should check the Server load (CPU/Memory), if it hits threshold, please suggest tolls and techniques available on this.

Thanks,
Amir

assuming you are using linux mate so...

hmmm...use TOP? or "free -m"

i wrote a script a while back...1 sec...lemme see if i can find it?

PacMan? · 01-17-2012, 09:22 AM

here you go budd:

cat /home/server_check.php
<?php
$myfile = file("/proc/loadavg"); //reads load avevrage(s)

$five = explode(" ", $myfile[0]); //5 minute load avevrage

if (($five[1] > 100) && ($five[0] > 25)) //if the 5 minute load average is above 100, email admin!
{
$to = "admin@domain.com";
$message = "Server #1 Load = $five[1]";
mail($to, "ALERT!", $message, "From: server1@domain.com");
}
?>

Reuti · 01-18-2012, 07:10 AM

Nowadays the Linux kernel also counts processes in state D as running. Hence the load maybe above 100%, but not by plain CPU load.

@aamerjavaid: how do you define threshold and toll in your context, what do you want to achieve? Do you want to free memory then for any additional process, or suspend processes, or kill them to start them later again? Is it a computing server, file server, web server, ...