amr/system_stats.php

## system_stats.php
<?php
/**
 * @file
 * Retrieves various load indicators from servers using SNMP.
 *
 * Licensed under GPL v3 or later.
 * Copyright 2009 (c) Egypt Development Center.
 */

/**
 * Configuration
 */
$servers = array(
    'localhost' => array(
	'name' => 'Localhost',
	'community' => 'public',
	'hostname' => 'localhost',
    ),
    'localhost2' => array(
	'name' => 'Localhost 2',
	'community' => 'public',
	'hostname' => 'localhost',
    ),
    'localhost3' => array(
	'name' => 'Localhost 3',
	'community' => 'public',
	'hostname' => 'localhost',
    ),
);

/**
 * YOU SHOULD NOT NEED TO MODIFY ANYTHING PAST THIS POINT.
 */

/**
 * Main
 */
if (!extension_loaded('snmp')) {
    die('SNMP module is required.');
}

snmp_set_valueretrieval(SNMP_VALUE_PLAIN);

// Collect data
$data = array();
foreach ($servers as $id => $server) {
    $data[$id] = array();

    // Load average
    $entries = snmpwalkoid($server['hostname'], $server['community'], 'UCD-SNMP-MIB::laLoad');
    $keys = array_map('simplify_oid', array_keys($entries));
    $data[$id]['load average'] = array_combine($keys, $entries);

    // Memory
    $entries = snmpwalkoid($server['hostname'], $server['community'], 'UCD-SNMP-MIB::memory');
    $keys = array_map('simplify_oid', array_keys($entries));
    $data[$id]['memory'] = array_combine($keys, $entries);
}

// Render
$output = '';
foreach ($data as $id => $info) {
    $output .= theme_server($servers[$id]['name'], $info);
}

echo theme_page($output);

function simplify_oid($oid) {
    list($mib, $object) = explode('::', $oid);
    return $object;
}

function theme_server($name, $info) {
    $output = '';

    $output .= '<div class="server">';
    $output .= '<h3>'. $name .'</h3>';
    $output .= '<dl>';

    // Load average
    $output .= '<dt>Load average</dt>';
    $output .= '<dd>'. theme_entry('Last minute', $info['load average']['laLoad.1']) .'</dd>';
    $output .= '<dd>'. theme_entry('Last 5 minutes', $info['load average']['laLoad.2']) .'</dd>';
    $output .= '<dd>'. theme_entry('Last 15 minutes', $info['load average']['laLoad.3']) .'</dd>';
    $output .= '</dt>';

    // Memory usage
    $output .= '<dt>Memory</dt>';
    $output .= '<dd>'. theme_entry('Total', round_size($info['memory']['memTotalReal.0'] * 1024)) .'</dd>';
    $output .= '<dd>'. theme_entry('Free', round_size($info['memory']['memAvailReal.0'] * 1024), 'Free and not utilized') .'</dd>';
    $output .= '<dd>'. theme_entry('Cached', round_size($info['memory']['memCached.0'] * 1024), 'Free, but utilized for disk cache') .'</dd>';
    $output .= '<dd>'. theme_entry('Total free', round_size(($info['memory']['memAvailReal.0'] + $info['memory']['memCached.0']) * 1024), 'Free + cached') .'</dd>';
    $output .= '</dt>';

    $output .= '</dl>';
    $output .= '</div>';

    return $output;
}

function theme_entry($label, $value, $description = '') {
    if (!empty($description)) {
	$description = '<span class="description">('. $description .')</span>';
    }
    return '<span class="label">'. $label .':</span><span class="value">'. $value .'</span>'. $description;
}

// From: http://snipplr.com/view/4633/convert-size-in-kb-mb-gb-/
function round_size($size) {
    $filesizename = array(" Bytes", " KB", " MB", " GB", " TB", " PB", " EB", " ZB", " YB");
    return $size ? round($size/pow(1024, ($i = floor(log($size, 1024)))), 2) . $filesizename[$i] : '0 Bytes';
}

function theme_page($page) {
    $output = <<<PAGE_HEADER
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN"
                      "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en" lang="en">
<head>
<title>Load watch</title>
<style type="text/css">
body {
  font-size: 88%;
}
div.server {
  float: left;
  width: 280px;
  border: 1px solid #ccc;
  padding: 10px;
  margin-right: 3px;
  margin-bottom: 3px;
}
div.server h3 {
  margin: 0;
}
dt {
  font-weight: bold;
  clear: both;
  color: darkblue;
}
dd {
  margin-left: 20px;
  clear: both;
}
.label {
  display: block;
  float: left;
  font-weight: bold;
  margin-right: 5px;
  width: 150px;
}
.description {
  display: none;
  margin-left: 10px;
  color: #666;
}
</style>
</head>
<body>
PAGE_HEADER;

    $output .= $page;

    $output .= '</body></html>';

    return $output;
}
	<?php
	/**
	* @file
	* Retrieves various load indicators from servers using SNMP.
	*
	* Licensed under GPL v3 or later.
	* Copyright 2009 (c) Egypt Development Center.
	*/

	/**
	* Configuration
	*/
	$servers = array(
	'localhost' => array(
	'name' => 'Localhost',
	'community' => 'public',
	'hostname' => 'localhost',
	),
	'localhost2' => array(
	'name' => 'Localhost 2',
	'community' => 'public',
	'hostname' => 'localhost',
	),
	'localhost3' => array(
	'name' => 'Localhost 3',
	'community' => 'public',
	'hostname' => 'localhost',
	),
	);

	/**
	* YOU SHOULD NOT NEED TO MODIFY ANYTHING PAST THIS POINT.
	*/

	/**
	* Main
	*/
	if (!extension_loaded('snmp')) {
	die('SNMP module is required.');
	}

	snmp_set_valueretrieval(SNMP_VALUE_PLAIN);

	// Collect data
	$data = array();
	foreach ($servers as $id => $server) {
	$data[$id] = array();

	// Load average
	$entries = snmpwalkoid($server['hostname'], $server['community'], 'UCD-SNMP-MIB::laLoad');
	$keys = array_map('simplify_oid', array_keys($entries));
	$data[$id]['load average'] = array_combine($keys, $entries);

	// Memory
	$entries = snmpwalkoid($server['hostname'], $server['community'], 'UCD-SNMP-MIB::memory');
	$keys = array_map('simplify_oid', array_keys($entries));
	$data[$id]['memory'] = array_combine($keys, $entries);
	}

	// Render
	$output = '';
	foreach ($data as $id => $info) {
	$output .= theme_server($servers[$id]['name'], $info);
	}

	echo theme_page($output);

	function simplify_oid($oid) {
	list($mib, $object) = explode('::', $oid);
	return $object;
	}

	function theme_server($name, $info) {
	$output = '';

	$output .= '<div class="server">';
	$output .= '<h3>'. $name .'</h3>';
	$output .= '<dl>';

	// Load average
	$output .= '<dt>Load average</dt>';
	$output .= '<dd>'. theme_entry('Last minute', $info['load average']['laLoad.1']) .'</dd>';
	$output .= '<dd>'. theme_entry('Last 5 minutes', $info['load average']['laLoad.2']) .'</dd>';
	$output .= '<dd>'. theme_entry('Last 15 minutes', $info['load average']['laLoad.3']) .'</dd>';
	$output .= '</dt>';

	// Memory usage
	$output .= '<dt>Memory</dt>';
	$output .= '<dd>'. theme_entry('Total', round_size($info['memory']['memTotalReal.0'] * 1024)) .'</dd>';
	$output .= '<dd>'. theme_entry('Free', round_size($info['memory']['memAvailReal.0'] * 1024), 'Free and not utilized') .'</dd>';
	$output .= '<dd>'. theme_entry('Cached', round_size($info['memory']['memCached.0'] * 1024), 'Free, but utilized for disk cache') .'</dd>';
	$output .= '<dd>'. theme_entry('Total free', round_size(($info['memory']['memAvailReal.0'] + $info['memory']['memCached.0']) * 1024), 'Free + cached') .'</dd>';
	$output .= '</dt>';

	$output .= '</dl>';
	$output .= '</div>';

	return $output;
	}

	function theme_entry($label, $value, $description = '') {
	if (!empty($description)) {
	$description = '<span class="description">('. $description .')</span>';
	}
	return '<span class="label">'. $label .':</span><span class="value">'. $value .'</span>'. $description;
	}

	// From: http://snipplr.com/view/4633/convert-size-in-kb-mb-gb-/
	function round_size($size) {
	$filesizename = array(" Bytes", " KB", " MB", " GB", " TB", " PB", " EB", " ZB", " YB");
	return $size ? round($size/pow(1024, ($i = floor(log($size, 1024)))), 2) . $filesizename[$i] : '0 Bytes';
	}

	function theme_page($page) {
	$output = <<<PAGE_HEADER
	<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN"
	"http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
	<html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en" lang="en">
	<head>
	<title>Load watch</title>
	<style type="text/css">
	body {
	font-size: 88%;
	}
	div.server {
	float: left;
	width: 280px;
	border: 1px solid #ccc;
	padding: 10px;
	margin-right: 3px;
	margin-bottom: 3px;
	}
	div.server h3 {
	margin: 0;
	}
	dt {
	font-weight: bold;
	clear: both;
	color: darkblue;
	}
	dd {
	margin-left: 20px;
	clear: both;
	}
	.label {
	display: block;
	float: left;
	font-weight: bold;
	margin-right: 5px;
	width: 150px;
	}
	.description {
	display: none;
	margin-left: 10px;
	color: #666;
	}
	</style>
	</head>
	<body>
	PAGE_HEADER;

	$output .= $page;

	$output .= '</body></html>';

	return $output;
	}