check_phpapc

#!/usr/bin/php -q
<?php
# ------------------------------------------------------------------
# We offer no warantee or guarantee - use this code at your own risk!
# All code is Copyright (C) 2011, Applied Trust Engineering, Inc.
# ------------------------------------------------------------------

# Nagios plugin for monitoring the APC opcode cache for PHP.
# The apc.php status script (which ships with php-apc) must be installed on the system to be monitoried and made accessible via HTTP/HTTPS.
# See: https://github.com/nmcclain/home/ned/check_phpapc

## config
$service_name = "PHP-APC";
$wget_or_curl_command = "wget -O - -q ";

## read arguments/set default thresholds
$options = getopt("U:f:m:");
if (isset($options["U"])) { 
        $url = $options["U"];
} else {
        usage();
}
if (isset($options["m"])) { 
        $used_pct_max = $options["m"];
} else {
        $used_pct_max = 90;
}
if (isset($options["f"])) { 
        $frag_pct_max = $options["f"];
} else {
        $frag_pct_max = 5;
}

## fetch APC stats from apc.php
$cmd = $wget_or_curl_command.$url;
$results = `$cmd`;
$output=array();
$status=0;

## parse APC stats from apc.php output
if (preg_match_all('/Host Status Diagrams.*Free:\s+(\S+\s\S+)\s+\((\S+)%\).*Hits:\s+(\S+)\s+\((\S+)%\).*Used:\s+(\S+\s\S+)\s+\((\S+)%\).*Misses:\s+(\S+)\s+\((\S+)%\).*Fragmentation:\s+(\S+)%.*<\/body>/msU', $results, $matches)) {
	$free = $matches[1][0];
	$free_pct = $matches[2][0];
	$hits = $matches[3][0];
	$hits_pct = $matches[4][0];
	$used = $matches[5][0];
	$used_pct = $matches[6][0];
	$miss = $matches[7][0];
	$miss_pct = $matches[8][0];
	$frag_pct = $matches[9][0];

	## check APC stats against thresholds
	$output[] = $used_pct."% used mem";
	if ($used_pct >= $used_pct_max) {
		if ($status < 2) { $status=1; }
	} 
	$output[] = $frag_pct."% fragmentation";
	if ($frag_pct >= $frag_pct_max) {
		if ($status < 2) { $status=1; }
	} 
	$perf = " | free_pct=".$free_pct."; hits_pct=".$hits_pct."; miss_pct=".$miss_pct."; frag_pct=".$frag_pct;
} else {
	$output[] = "Could not parse apc.php output";
	$status=2;
}

## output results
echo $service_name;
if ($status == 0) {
	echo " OK: ";
} else if ($status == 1) {
	echo " WARNING: ";
} else {
	echo " CRITICAL: ";
} 
echo join(', ',$output ).$perf."\n";

exit($status);

#########
function usage() {
	echo "Usage: check_phpapc -U <full URL to apc.php> [-m <max_used_memory_pct>] [-f <max_fragmentation>]\n";
	echo "Usage example: check_phpapc -U http://admin.com/apc.php -m 90 -f 10\n";
	exit(1);
}