Bernard Li wrote:
> Can you explain a bit regarding how you integrate the Ganglia metrics
> into Nagios? Is this automated?
>
What you have to know is that Nagios is just an alerting engine. Real
work for Nagios is done using Nagios plugins that provide the necessary
checks. Nagios simply schedules these checks depending on the
configuration and based on the return value of the script e.g. 0 for OK,
1 for WARNING and 2 for CRITICAL, 3 for UNKNOWN etc. an alert is sent.
So what you have to do is write a script that is aware of Ganglia
metrics and is able to produce error codes. Since I couldn't get the
python script to give me raw metrics I needed to install whole Ganglia
suite on my Nagios box ie. gmond/gmetad with Web Interface. You also
need to install PHP interpreter (php-cli RPM for those uninitiated) Then
you do something like this
<?php
$ganglia_web="/var/www/html/ganglia";
include_once "$ganglia_web/conf.php";
include_once "$ganglia_web/get_context.php";
# This is important. You get cluster summary
$context = "cluster";
include_once "$ganglia_web/functions.php";
include_once "$ganglia_web/ganglia.php";
include_once "$ganglia_web/get_ganglia.php";
print_r ($metrics)
?>
Put this in a file then run
php stuff.php
And you get a nice array output of all Ganglia metrics. Then you just
pick them out. For instance I have used swap_free and disk_free in the
past. All you have to do is
$hostname = "host.domain.com";
print $metrics[$hostname]['swap_free']['VAL'];
and voila you get swap_free value :-). Then you just write something
that checks against some value
if ( $metrics[$hostname]['swap_free']['VAL'] > $argv[2] ) {
print ("SWAP OK");
exit (0);
} else {
print "SWAP CRITICAL";
exit (2);
}
and you integrate this into Nagios. If I am motivated enough I'll write
a generic Ganglia Nagios script :-).
Vladimir
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