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Full Discussion: Nagios script to get total and free memory
Top Forums Shell Programming and Scripting Nagios script to get total and free memory Post 302885442 by berveglieri on Sunday 26th of January 2014 10:10:43 AM
Old 01-26-2014
Nagios script to get total and free memory
Hi Experts, need some help.

I`m trying to write a shell script to get free, used and total memory on our linux servers.
It's working great, but i need follow some standards to make it a real nagios plugin.
It's pretty simple, you just type two parameters to the script, check_ram -w 80 -c 90 #just an exemple.
I don't want that it displays the amount of memory if no parameters was passed to the script.
#exemple: check_ram -w -c should give error and call the function HELP without show used and free memory. But it keeping ignoring the breaks and showing the used and free memory.
w and c need have values to let script continue.
Code:
  1 #!/bin/bash
  2 # 
  3 #
  4 #
  5 #
  6 #
  7 #
  8 #Display the name of the script
  9 SCRIPTNAME="check_memory"
 10 
 11 #Display version
 12 VERSION(){
 13 echo "Version 0.8"
 14 }
 15 
 16 #Display help
 17 HELP(){
 18 echo "$SCRIPTNAME -w <warning level> -c <critical level>"
 19 echo "example: check_ram -w 80 -c 90"
 20 }
 21 
 22 #sequence parameters
 23 w=$1 
 24 c=$2
 25   
 26 while [[ $# -gt 0 ]]
 27 do
 28 case $1 in
 29         -h | --help)VERSION;HELP;;
 30         -w) test -z $w ;if [ $? != 0 ]; then HELP ; fi; break;;
 31         -c) test -z $c ;if [ $? != 0 ]; then HELP ; fi; break;;
 32         *)VERSION;HELP; break;;
 33 esac
 34 done 
 35 
 36 full=$(free -m | awk 'NR==2 {print $2}')
 37 used=$(free -m | awk 'NR==3 {print $3}')
 38 free=$(free -m | awk 'NR==3 {print $4}')
 39 
 40 percent=$(( ($free*100)/$full))
 41 
 42 if [ $used -lt $(( ($full*80)/100 )) ] || [ $free -lt $(( ($full*80)/100 )) ];then
 43 echo "OK: using $used MB, you still have $percent% of free memory"
 44 exit 0
 45 fi
 46 
 47 
 48 
                                                                                                                                                      38,1          Fim

Thank you anyway.
 

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LEARN ABOUT PHP

memory_get_usage

MEMORY_GET_USAGE(3)							 1						       MEMORY_GET_USAGE(3)

memory_get_usage - Returns the amount of memory allocated to PHP

SYNOPSIS

       int memory_get_usage ([bool  $real_usage = false])

DESCRIPTION

	Returns the amount of memory, in bytes, that's currently being allocated to your PHP script.

PARAMETERS

	      o $real_usage
		-  Set this to TRUE to get the real size of memory allocated from system. If not set or FALSE only the memory used by emalloc() is
		reported.

RETURN VALUES

	Returns the memory amount in bytes.

CHANGELOG

       +--------+---------------------------------------------------+
       |Version |						    |
       |	|						    |
       |	|		     Description		    |
       |	|						    |
       +--------+---------------------------------------------------+
       | 5.2.1	|						    |
       |	|						    |
       |	|  Compiling  with  --enable-memory-limit   is	 no |
       |	| longer required for this function to exist.	    |
       |	|						    |
       | 5.2.0	|						    |
       |	|						    |
       |	|	       $real_usage was added.		    |
       |	|						    |
       +--------+---------------------------------------------------+
EXAMPLES

       Example #1

	      A memory_get_usage(3) example

	      <?php
	      // This is only an example, the numbers below will
	      // differ depending on your system

	      echo memory_get_usage() . "
"; // 36640

	      $a = str_repeat("Hello", 4242);

	      echo memory_get_usage() . "
"; // 57960

	      unset($a);

	      echo memory_get_usage() . "
"; // 36744

	      ?>

SEE ALSO

       memory_get_peak_usage(3), memory_limit.

PHP Documentation Group 												       MEMORY_GET_USAGE(3)
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