Stackpole, Chris wrote:
I have been wondering if it would be possible to use some kind of
metric to pass information from the “nodes” back to the Ganglia
frontend and have them displayed on a sub webpage.
I did not find anything in the archives so I figured I would ask for
pointers before I began on my own. Does anyone have any ideas on how
feasible this may be and where I might begin?
I would think this would be feasible. You can use gmetric to add your
own "metrics". A metric can be a string.
For example we use Nagios for alerting and to avoid having to use
Nagios' nsca daemon to pass information like diskfree I simply use
Ganglia to get that info (since it already runs on the Nagios box). If
you can get the ganglia python client running use that. Otherwise I
wrote a command line PHP script that uses Ganglia's web frontend scripts
to parse Ganglia's XML. Here is my code that simply
Hope this helps.
#!/usr/bin/php
<?php
######################################################################################
$GANGLIA_DIR='/srv/www/htdocs/ganglia';
######################################################################################
if ( $argc != 2 ) {
echo "Not enough arguments. Please supply Fully Qualified name for
the host
Usage: $argv[0] <hostname> ie.
$argv[0] server.domain.net
Exiting ....\n";
exit (1);
}
include_once $GANGLIA_DIR . "/conf.php";
include_once $GANGLIA_DIR . "/get_context.php";
$context = "cluster";
include_once $GANGLIA_DIR . "/functions.php";
include_once $GANGLIA_DIR . "/ganglia.php";
include_once $GANGLIA_DIR . "/get_ganglia.php";
# Make sure it is FQDN
if ( strpos($argv[1], ".") != FALSE )
$hostname = substr($argv[1], 0, strpos($argv[1], "."));
else
$hostname = $argv[1];
######################################################################################
# Get list of hosts in Ganglia
######################################################################################
$ganglia_hosts = array_keys($metrics);
######################################################################################
# Because we have multiple interfaces on machines we need to find the
exact name
# of the machine that the Ganglia is using otherwise this script blows up
######################################################################################
for ( $i = 0 ; $i < sizeof($ganglia_hosts) ; $i++ ) {
if ( eregi ( $hostname, $ganglia_hosts[$i] ) ) {
$fqdn = $ganglia_hosts[$i];
break;
}
}
######################################################################################
# $metrics is an array of [Metrics][Hostname][NAME|VAL|TYPE|UNITS|SOURCE].
# Make sure that hostname actually has metrics available. If not report
UNKNOWN state
######################################################################################
if ( ! is_array($metrics[$fqdn])) {
echo("DISKFREE UNKNOWN - Hostname info not available. Likely invalid
hostname");
exit(3);
}
# Make sure that host is providing disk_free and disk_total to the cluster
if ( isset($metrics[$fqdn]['disk_free']['VAL']) &&
isset($metrics[$fqdn]['disk_total']['VAL']) ) {
$disk_free_percent =
$metrics[$fqdn]['disk_free']['VAL']/$metrics[$fqdn]['disk_total']['VAL'];
} else {
echo("DISKFREE UNKNOWN - Disk free or disk total not available for
this host.");
exit(3);
}
######################################################################################
# If disk available is less then 8% mark it critical
######################################################################################
if ( $disk_free_percent > 0.08 ) {
echo(sprintf("DISKFREE OK - %01.2f%% free\n", $disk_free_percent
* 100));
exit (0);
} else {
echo(sprintf("DISKFREE CRITICAL - %01.2f%% free\n",
$disk_free_percent * 100));
exit (2);
}
?>
