Created
July 1, 2010 08:05
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| <?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; | |
| } |
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