Nagios memory percentages

[Giles Coochey]

Perhaps, rather than cut, try grep -o '[0-9][0-9]*'

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From: nagios-users-bounces at lists.sourceforge.net [mailto:nagios-users-bounces at lists.sourceforge.net] On Behalf Of Machiel Richards
Sent: 11 March 2008 13:41
To: nagios-users at lists.sourceforge.net
Subject: Re: [Nagios-users] Nagios memory percentages

Hi

  I am trying to use this option but the issue I have now is with the following:

The output from the /proc/meminfo is  as follows:

            MemFree:      206788 kB

   However, when I try to use cut in order to only get the numeric value, the output I get back does not work that well as it still includes the <spaces> infront of the numeric value as well as the kb at the end...

            I have even tried this with free and the same result....

            What should I use as delimiter to the cut command?

            Any other suggestions on how to only get the numeric value?

            Commands used with output:

cat /proc/meminfo | grep MemTotal | cut -f 2 -d ":"

output :

      2067884 kB


  As you can see the spaces are all out of place.....

      I have also noticed that when using a space as delimiter and counting the spaces to the value, then you get the result, however if the numeric value increase by one digit (i.e. from 6 digits to 7 digits for instance) then the amount of spaces change and the program does not work.




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From: nagios-users-bounces at lists.sourceforge.net [mailto:nagios-users-bounces at lists.sourceforge.net] On Behalf Of Dale J. Chatham
Sent: Tuesday, March 11, 2008 1:15 PM
To: Machiel Richards
Cc: nagios-users at lists.sourceforge.net
Subject: Re: [Nagios-users] Nagios memory percentages

Looc at the /proc/meminfo file and the vmstat command.

Divide memory parameter (free, used, whatever) by total memory, multiply by 100 and you have percent.

Machiel Richards wrote: 
Hi Everyone
 
  Maybe someone can assist me, but this may be a more linux specific question than Nagios even though related to Nagios.
 
   I need to monitor the memory usage in percentage on Nagios and would like to rather write my own scripts for this.
 
 
   I know there are snmp versions of this to do the job for me, however I do not want to complicate the systems with too many clients running on them.
 
Currently we are using the normal nrpe to connect to the systems and run scripts remotely, however we do not have one to monitor the memory.
 
            On the web there are a lot of references to the snmp commands but as all the systems are production and we might be having a couple of upgrades soon, I would like to rather keep it simple and only run one client on it for all Nagios connections.
 
 
            My question is this... I can use the command free to get the amount of memory , used, free etc... 
 
            How can I write this into a script to display as percentages... is there another command I can use or maybe an option that I do not know about?
 
tx
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