Detailed explanation of Mencached cache configuration based on Nginx

Detailed explanation of Mencached cache configuration based on Nginx

Deploy Nginx and PHP on the master and backup machines

Deploy memcache

Deploy memcached client on mid machine

[root@mid ~]# yum install memcached -y
#Start the service[root@mid ~]# systemctl start memcached.service

#Check the startup status, click Enter and if ERROR appears, the startup is successful [root@master ~]# telnet 192.168.29.133 11211
Trying 192.168.29.133...
Connected to 192.168.29.133.
Escape character is '^]'.

ERROR

Deploy PHP memcached extension on master and mid machines

Download libmemcached and memcached compressed packages

#Unzip and install libmemcached
[root@master ~]#tar -xvf libmemcached-1.0.18.tar.gz
[root@master ~]#cd libmemcached-1.0.18
#If the compilation reports an error, change the false value in the corresponding position of the error in clients/memflush.cc to NULL
[root@master ~]#./configure --prefix=/usr/local/libmemcached
make && make install

#Unzip and install memcached
[root@master ~]#tar -zxvf memcached-3.1.5.tgz
[root@master ~]#cd memcached-3.1.5
[root@master ~]#phpize
[root@master ~]#./configure --with-libmemcached-dir=/usr/local/libmemcached --disable-memcached-sasl
[root@master ~]#make && make install

#After completion, check whether there is an extension memcached.so in lib/php/extensions/no-debug-zts-20170718/ in the php directory

#Add extension to php configuration file [root@master ~]# vi /usr/local/php/etc/php.ini
extension=memcached.so

Test verification

[root@master ~]# vi /usr/local/nginx/html/test.php 
<?php
phpinfo();
?>

Visit http://ip/test.php


Note: Bak machine performs the same operation

Configure Cache

Configure Nginx Configuration File

[root@master ~]# cat /usr/local/nginx/conf/nginx.conf
worker_processes 1;
events {
  worker_connections 1024;
}
http {
  include mime.types;
  default_type application/octet-stream;
  sendfile on;
  keepalive_timeout 65;
  server {
    listen 80;
    server_name localhost;
    location / {
      root html;
      index index.html index.htm;
    }
  #memcached cache configuration, read if there is cache, report 404 error if there is no cache location /demo/ {
    set $memcached_key $request_uri;
    add_header X-mem-key $memcached_key;
    memcached_pass 192.168.29.133:11211;
    default_type text/html;
    #Go to a specific location after an error is reported
    error_page 404 502 504 = @mymemcached;
  }
  #Configure the rewrite strategy to execute a specific PHP file location @mymemcached {
    rewrite .* /demo.php?key=$request_uri;
  }
    location ~ \.php$ {
      root html;
      fastcgi_pass 127.0.0.1:9000;
      fastcgi_index index.php;
      fastcgi_param SCRIPT_FILENAME $document_root$fastcgi_script_name;
      include fastcgi_params;
    }
  }
}

Write a PHP file to set up memcached cache

#Create demo folder [root@master ~] mkdir /usr/local/nginx/html/demo
#Create a test file [root@master ~] echo "123" >> /usr/local/nginx/html/demo/123.html

[root@master ~]# vi /usr/local/nginx/html/demo.php 
<?php
  $fn=dirname(__FILE__) . $_SERVER['REQUEST_URI'];
  if(file_exists($fn)){
    $data=file_get_contents($fn);
    $m=new Memcached();
    $server=array(
      array('192.168.29.133',11211)
    );
    $m->addServers($server);
    $r=$m->set($_GET['key'],$data);
    header('Content-Length:'.filesize($fn)."\r\n");
    header('Content-Type:file'."\r\n");
    header('X-cache:MISS:'."\r\n");
    echo $data;
  }
  #If the demo folder does not exist, return to the home page else{
    header('Location:../index.html'."\r\n");
  }
?>

Note: The same settings are performed on the bak machine

Test verification

#It can be seen that there is no cache in memcache the first time, and the cache is hit the second time [root@bak ~]# curl -I http://192.168.29.132/demo/123.html
HTTP/1.1 200 OK
Server: nginx/1.16.1
Date: Thu, 25 Jun 2020 02:23:00 GMT
Content-Type: file
Content-Length: 4
Connection: keep-alive
X-Powered-By: PHP/7.2.26
X-cache: MISS:

[root@bak ~]# curl -I http://192.168.29.132/demo/123.html
HTTP/1.1 200 OK
Server: nginx/1.16.1
Date: Thu, 25 Jun 2020 02:23:01 GMT
Content-Type: text/html
Content-Length: 4
Connection: keep-alive
X-mem-key: /demo/123.html
Accept-Ranges: bytes

#After setting up the cache, when accessing the same cache key, the cache can be hit even if the machines initiating the access are different [root@master ~]# curl -I http://192.168.29.138/demo/123.html
HTTP/1.1 200 OK
Server: nginx/1.16.1
Date: Thu, 25 Jun 2020 02:29:46 GMT
Content-Type: text/html
Content-Length: 4
Connection: keep-alive
X-mem-key: /demo/123.html
Accept-Ranges: bytes

Check memcached cache status


memcached monitoring files

<?php
/*
 +----------------------------------------------------------------------+
 | PHP Version 5 |
 +----------------------------------------------------------------------+
 | Copyright (c) 1997-2004 The PHP Group |
 +----------------------------------------------------------------------+
 | This source file is subject to version 3.0 of the PHP license, |
 | that is bundled with this package in the file LICENSE, and is |
 | available through the world-wide-web at the following url: |
 | http://www.php.net/license/3_0.txt. |
 | If you did not receive a copy of the PHP license and are unable to |
 | obtain it through the world-wide-web, please send a note to |
 | [email protected] so we can mail you a copy immediately. |
 +----------------------------------------------------------------------+
 | Author: Harun Yayli <harunyayli at gmail.com> |
 +----------------------------------------------------------------------+
*/
//memcached graphical gadget $VERSION='$Id: memcache.php,v 1.1.2.3 2008/08/28 18:07:54 mikl Exp $';
#Set username define('ADMIN_USERNAME','admin'); 
#Set password define('ADMIN_PASSWORD','123456'); 

define('DATE_FORMAT','Y/m/d H:i:s');
define('GRAPH_SIZE',200);
define('MAX_ITEM_DUMP',50);

#Set memcached host information $MEMCACHE_SERVERS[] = '192.168.29.133:11211'; 

////////// END OF DEFAULT CONFIG AREA /////////////////////////////////////////////////////////////

///////////////// Password protect ////////////////////////////////////////////////////////////////
if (!isset($_SERVER['PHP_AUTH_USER']) || !isset($_SERVER['PHP_AUTH_PW']) ||
      $_SERVER['PHP_AUTH_USER'] != ADMIN_USERNAME || $_SERVER['PHP_AUTH_PW'] != ADMIN_PASSWORD) {
      Header("WWW-Authenticate: Basic realm=\"Memcache Login\"");
      Header("HTTP/1.0 401 Unauthorized");

      echo <<<EOB
        <html><body>
        <h1>Rejected!</h1>
        <big>Wrong Username or Password!</big>
        </body></html>
EOB;
      exit;
}

///////////MEMCACHE FUNCTIONS /////////////////////////////////////////////////////////////////////

function sendMemcacheCommands($command){
  global $MEMCACHE_SERVERS;
  $result = array();

  foreach($MEMCACHE_SERVERS as $server){
    $strs = explode(':',$server);
    $host = $strs[0];
    $port = $strs[1];
    $result[$server] = sendMemcacheCommand($host,$port,$command);
  }
  return $result;
}
function sendMemcacheCommand($server,$port,$command){

  $s = @fsockopen($server,$port);
  if (!$s){
    die("Cant connect to:".$server.':'.$port);
  }

  fwrite($s, $command."\r\n");

  $buf='';
  while ((!feof($s))) {
    $buf .= fgets($s, 256);
    if (strpos($buf,"END\r\n")!==false){ // stat says end
      break;
    }
    if (strpos($buf,"DELETED\r\n")!==false || strpos($buf,"NOT_FOUND\r\n")!==false){ // delete says these
      break;
    }
    if (strpos($buf,"OK\r\n")!==false){ // flush_all says ok
      break;
    }
  }
  fclose($s);
  return parseMemcacheResults($buf);
}
function parseMemcacheResults($str){

  $res = array();
  $lines = explode("\r\n",$str);
  $cnt = count($lines);
  for($i=0; $i< $cnt; $i++){
    $line = $lines[$i];
    $l = explode(' ',$line,3);
    if (count($l)==3){
      $res[$l[0]][$l[1]]=$l[2];
      if ($l[0]=='VALUE'){ // next line is the value
        $res[$l[0]][$l[1]] = array();
        list ($flag,$size)=explode(' ',$l[2]);
        $res[$l[0]][$l[1]]['stat']=array('flag'=>$flag,'size'=>$size);
        $res[$l[0]][$l[1]]['value']=$lines[++$i];
      }
    }elseif($line=='DELETED' || $line=='NOT_FOUND' || $line=='OK'){
      return $line;
    }
  }
  return $res;

}

function dumpCacheSlab($server,$slabId,$limit){
  list($host,$port) = explode(':',$server);
  $resp = sendMemcacheCommand($host,$port,'stats cachedump '.$slabId.' '.$limit);

  return $resp;

}

function flushServer($server){
  list($host,$port) = explode(':',$server);
  $resp = sendMemcacheCommand($host,$port,'flush_all');
  return $resp;
}
function getCacheItems(){
 $items = sendMemcacheCommands('stats items');
 $serverItems = array();
 $totalItems = array();
 foreach ($items as $server=>$itemlist){
  $serverItems[$server] = array();
  $totalItems[$server]=0;
  if (!isset($itemlist['STAT'])){
    continue;
  }

  $iteminfo = $itemlist['STAT'];

  foreach($iteminfo as $keyinfo=>$value){
    if (preg_match('/items\:(\d+?)\:(.+?)$/',$keyinfo,$matches)){
      $serverItems[$server][$matches[1]][$matches[2]] = $value;
      if ($matches[2]=='number'){
        $totalItems[$server] +=$value;
      }
    }
  }
 }
 return array('items'=>$serverItems,'counts'=>$totalItems);
}
function getMemcacheStats($total=true){
  $resp = sendMemcacheCommands('stats');
  if ($total){
    $res = array();
    foreach($resp as $server=>$r){
      foreach($r['STAT'] as $key=>$row){
        if (!isset($res[$key])){
          $res[$key]=null;
        }
        switch ($key){
          case 'pid':
            $res['pid'][$server]=$row;
            break;
          case 'uptime':
            $res['uptime'][$server]=$row;
            break;
          case 'time':
            $res['time'][$server]=$row;
            break;
          case 'version':
            $res['version'][$server]=$row;
            break;
          case 'pointer_size':
            $res['pointer_size'][$server]=$row;
            break;
          case 'rusage_user':
            $res['rusage_user'][$server]=$row;
            break;
          case 'rusage_system':
            $res['rusage_system'][$server]=$row;
            break;
          case 'curr_items':
            $res['curr_items']+=$row;
            break;
          case 'total_items':
            $res['total_items']+=$row;
            break;
          case 'bytes':
            $res['bytes']+=$row;
            break;
          case 'curr_connections':
            $res['curr_connections']+=$row;
            break;
          case 'total_connections':
            $res['total_connections']+=$row;
            break;
          case 'connection_structures':
            $res['connection_structures']+=$row;
            break;
          case 'cmd_get':
            $res['cmd_get']+=$row;
            break;
          case 'cmd_set':
            $res['cmd_set']+=$row;
            break;
          case 'get_hits':
            $res['get_hits']+=$row;
            break;
          case 'get_misses':
            $res['get_misses']+=$row;
            break;
          case 'evictions':
            $res['evictions']+=$row;
            break;
          case 'bytes_read':
            $res['bytes_read']+=$row;
            break;
          case 'bytes_written':
            $res['bytes_written']+=$row;
            break;
          case 'limit_maxbytes':
            $res['limit_maxbytes']+=$row;
            break;
          case 'threads':
            $res['rusage_system'][$server]=$row;
            break;
        }
      }
    }
    return $res;
  }
  return $resp;
}

//////////////////////////////////////////////////////

//
// don't cache this page
//
header("Cache-Control: no-store, no-cache, must-revalidate"); // HTTP/1.1
header("Cache-Control: post-check=0, pre-check=0", false);
header("Pragma: no-cache"); // HTTP/1.0

function duration($ts) {
  global $time;
  $years = (int)((($time - $ts)/(7*86400))/52.177457);
  $rem = (int)(($time - $ts) - ($years * 52.177457 * 7 * 86400));
  $weeks = (int)(($rem)/(7*86400));
  $days = (int)(($rem)/86400) - $weeks*7;
  $hours = (int)(($rem)/3600) - $days*24 - $weeks*7*24;
  $mins = (int)(($rem)/60) - $hours*60 - $days*24*60 - $weeks*7*24*60;
  $str = '';
  if($years==1) $str .= "$years year, ";
  if($years>1) $str .= "$years years, ";
  if($weeks==1) $str .= "$weeks week, ";
  if($weeks>1) $str .= "$weeks weeks, ";
  if($days==1) $str .= "$days day,";
  if($days>1) $str .= "$days days,";
  if($hours == 1) $str .= " $hours hour and";
  if($hours>1) $str .= " $hours hours and";
  if($mins == 1) $str .= " 1 minute";
  else $str .= " $mins minutes";
  return $str;
}

// create graphics
//
function graphics_avail() {
  return extension_loaded('gd');
}

function bsize($s) {
  foreach (array('','K','M','G') as $i => $k) {
    if ($s < 1024) break;
    $s/=1024;
  }
  return sprintf("%5.1f %sBytes",$s,$k);
}

// create menu entry
function menu_entry($ob,$title) {
  global $PHP_SELF;
  if ($ob == $_GET['op']){
    return "<li><a class=\"child_active\" href=\"$PHP_SELF&op=$ob\">$title</a></li>";
  }
  return "<li><a class=\"active\" href=\"$PHP_SELF&op=$ob\">$title</a></li>";
}

function getHeader(){
  $header = <<<EOB
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head><title>MEMCACHE INFO</title>
<style type="text/css"><!--
body { background:white; font-size:100.01%; margin:0; padding:0; }
body,p,td,th,input,submit { font-size:0.8em;font-family:arial,helvetica,sans-serif; }
* html body {font-size:0.8em}
* html p {font-size:0.8em}
* html td {font-size:0.8em}
* html th {font-size:0.8em}
* html input {font-size:0.8em}
* html submit {font-size:0.8em}
td { vertical-align:top }
a { color:black; font-weight:none; text-decoration:none; }
a:hover { text-decoration:underline; }
div.content { padding:1em 1em 1em 1em; position:absolute; width:97%; z-index:100; }

h1.memcache { background:rgb(153,153,204); margin:0; padding:0.5em 1em 0.5em 1em; }
* html h1.memcache { margin-bottom:-7px; }
h1.memcache a:hover { text-decoration:none; color:rgb(90,90,90); }
h1.memcache span.logo {
  background:rgb(119,123,180);
  color:black;
  border-right: solid black 1px;
  border-bottom: solid black 1px;
  font-style:italic;
  font-size:1em;
  padding-left:1.2em;
  padding-right:1.2em;
  text-align:right;
  display:block;
  width:130px;
  }
h1.memcache span.logo span.name { color:white; font-size:0.7em; padding:0 0.8em 0 2em; }
h1.memcache span.nameinfo { color:white; display:inline; font-size:0.4em; margin-left: 3em; }
h1.memcache div.copy { color:black; font-size:0.4em; position:absolute; right:1em; }
hr.memcache {
  background:white;
  border-bottom:solid rgb(102,102,153) 1px;
  border-style:none;
  border-top:solid rgb(102,102,153) 10px;
  height:12px;
  margin:0;
  margin-top:1px;
  padding:0;
}

ol,menu { margin:1em 0 0 0; padding:0.2em; margin-left:1em;}
ol.menu li { display:inline; margin-right:0.7em; list-style:none; font-size:85%}
ol.menu a {
  background:rgb(153,153,204);
  border:solid rgb(102,102,153) 2px;
  color:white;
  font-weight:bold;
  margin-right:0em;
  padding:0.1em 0.5em 0.1em 0.5em;
  text-decoration:none;
  margin-left: 5px;
  }
ol.menu a.child_active {
  background:rgb(153,153,204);
  border:solid rgb(102,102,153) 2px;
  color:white;
  font-weight:bold;
  margin-right:0em;
  padding:0.1em 0.5em 0.1em 0.5em;
  text-decoration:none;
  border-left: solid black 5px;
  margin-left: 0px;
  }
ol.menu span.active {
  background:rgb(153,153,204);
  border:solid rgb(102,102,153) 2px;
  color:black;
  font-weight:bold;
  margin-right:0em;
  padding:0.1em 0.5em 0.1em 0.5em;
  text-decoration:none;
  border-left: solid black 5px;
  }
ol.menu span.inactive {
  background:rgb(193,193,244);
  border:solid rgb(182,182,233) 2px;
  color:white;
  font-weight:bold;
  margin-right:0em;
  padding:0.1em 0.5em 0.1em 0.5em;
  text-decoration:none;
  margin-left: 5px;
  }
ol.menu a:hover {
  background:rgb(193,193,244);
  text-decoration:none;
  }

div.info {
  background:rgb(204,204,204);
  border:solid rgb(204,204,204) 1px;
  margin-bottom:1em;
  }
div.info h2 {
  background:rgb(204,204,204);
  color:black;
  font-size:1em;
  margin:0;
  padding:0.1em 1em 0.1em 1em;
  }
div.info table {
  border:solid rgb(204,204,204) 1px;
  border-spacing:0;
  width:100%;
  }
div.info table th {
  background:rgb(204,204,204);
  color:white;
  margin:0;
  padding:0.1em 1em 0.1em 1em;
  }
div.info table th a.sortable { color:black; }
div.info table tr.tr-0 { background:rgb(238,238,238); }
div.info table tr.tr-1 { background:rgb(221,221,221); }
div.info table td { padding:0.3em 1em 0.3em 1em; }
div.info table td.td-0 { border-right:solid rgb(102,102,153) 1px; white-space:nowrap; }
div.info table td.td-n { border-right:solid rgb(102,102,153) 1px; }
div.info table td h3 {
  color:black;
  font-size:1.1em;
  margin-left:-0.3em;
  }
.td-0 a , .td-n a, .tr-0 a , tr-1 a {
  text-decoration:underline;
}
div.graph { margin-bottom:1em }
div.graph h2 { background:rgb(204,204,204);; color:black; font-size:1em; margin:0; padding:0.1em 1em 0.1em 1em; }
div.graph table { border:solid rgb(204,204,204) 1px; color:black; font-weight:normal; width:100%; }
div.graph table td.td-0 { background:rgb(238,238,238); }
div.graph table td.td-1 { background:rgb(221,221,221); }
div.graph table td { padding:0.2em 1em 0.4em 1em; }

div.div1,div.div2 { margin-bottom:1em; width:35em; }
div.div3 { position:absolute; left:40em; top:1em; width:580px; }
//div.div3 { position:absolute; left:37em; top:1em; right:1em; }

div.sorting { margin:1.5em 0em 1.5em 2em }
.center { text-align:center }
.aright { position:absolute;right:1em }
.right { text-align:right }
.ok { color:rgb(0,200,0); font-weight:bold}
.failed { color:rgb(200,0,0); font-weight:bold}

span.box {
  border: black solid 1px;
  border-right:solid black 2px;
  border-bottom:solid black 2px;
  padding:0 0.5em 0 0.5em;
  margin-right:1em;
}
span.green { background:#60F060; padding:0 0.5em 0 0.5em}
span.red { background:#D06030; padding:0 0.5em 0 0.5em }

div.authneeded {
  background:rgb(238,238,238);
  border:solid rgb(204,204,204) 1px;
  color:rgb(200,0,0);
  font-size:1.2em;
  font-weight:bold;
  padding:2em;
  text-align:center;
  }

input {
  background:rgb(153,153,204);
  border:solid rgb(102,102,153) 2px;
  color:white;
  font-weight:bold;
  margin-right:1em;
  padding:0.1em 0.5em 0.1em 0.5em;
  }
//-->
</style>
</head>
<body>
<div class="head">
  <h1 class="memcache">
    <span class="logo"><a href="http://pecl.php.net/package/memcache" rel="external nofollow" >memcache</a></span>
    memcache.php by Harun Yayli
  </h1>
  <hr class="memcache">
</div>
<div class=content>
EOB;

  return $header;
}
function getFooter(){
  global $VERSION;
  $footer = '</div><!-- Based on apc.php '.$VERSION.'--></body>
</html>
';

  return $footer;

}
function getMenu(){
  global $PHP_SELF;
echo "<ol class=menu>";
if ($_GET['op']!=4){
echo <<<EOB
  <li><a href="$PHP_SELF&op={$_GET['op']}" rel="external nofollow" >Refresh Data</a></li>
EOB;
}
else {
echo <<<EOB
  <li><a href="$PHP_SELF&op=2}" rel="external nofollow" >Back</a></li>
EOB;
}
echo
  menu_entry(1,'View Host Stats'),
  menu_entry(2,'Variables');

echo <<<EOB
  </ol>
  <br/>
EOB;
}

// TODO, AUTH

$_GET['op'] = !isset($_GET['op'])? '1':$_GET['op'];
$PHP_SELF = isset($_SERVER['PHP_SELF']) ? htmlentities(strip_tags($_SERVER['PHP_SELF'],'')) : '';

$PHP_SELF=$PHP_SELF.'?';
$time = time();
// sanitize _GET

foreach($_GET as $key=>$g){
  $_GET[$key]=htmlentities($g);
}

// singleout
// when singleout is set, it only gives details for that server.
if (isset($_GET['singleout']) && $_GET['singleout']>=0 && $_GET['singleout'] <count($MEMCACHE_SERVERS)){
  $MEMCACHE_SERVERS = array($MEMCACHE_SERVERS[$_GET['singleout']]);
}

// display images
if (isset($_GET['IMG'])){
  $memcacheStats = getMemcacheStats();
  $memcacheStatsSingle = getMemcacheStats(false);

  if (!graphics_avail()) {
    exit(0);
  }

  function fill_box($im, $x, $y, $w, $h, $color1, $color2,$text='',$placeindex='') {
    global $col_black;
    $x1=$x+$w-1;
    $y1=$y+$h-1;

    imagerectangle($im, $x, $y1, $x1+1, $y+1, $col_black);
    if($y1>$y) imagefilledrectangle($im, $x, $y, $x1, $y1, $color2);
    else imagefilledrectangle($im, $x, $y1, $x1, $y, $color2);
    imagerectangle($im, $x, $y1, $x1, $y, $color1);
    if ($text) {
      if ($placeindex>0) {

        if ($placeindex<16)
        {
          $px=5;
          $py=$placeindex*12+6;
          imagefilledrectangle($im, $px+90, $py+3, $px+90-4, $py-3, $color2);
          imageline($im,$x,$y+$h/2,$px+90,$py,$color2);
          imagestring($im,2,$px,$py-6,$text,$color1);

        } else {
          if ($placeindex<31) {
            $px=$x+40*2;
            $py=($placeindex-15)*12+6;
          } else {
            $px=$x+40*2+100*intval(($placeindex-15)/15);
            $py=($placeindex%15)*12+6;
          }
          imagefilledrectangle($im, $px, $py+3, $px-4, $py-3, $color2);
          imageline($im,$x+$w,$y+$h/2,$px,$py,$color2);
          imagestring($im,2,$px+2,$py-6,$text,$color1);
        }
      } else {
        imagestring($im,4,$x+5,$y1-16,$text,$color1);
      }
    }
  }

  function fill_arc($im, $centerX, $centerY, $diameter, $start, $end, $color1, $color2, $text='', $placeindex=0) {
    $r=$diameter/2;
    $w=deg2rad((360+$start+($end-$start)/2)%360);

    if (function_exists("imagefilledarc")) {
      // exists only if GD 2.0.1 is available
      imagefilledarc($im, $centerX+1, $centerY+1, $diameter, $diameter, $start, $end, $color1, IMG_ARC_PIE);
      imagefilledarc($im, $centerX, $centerY, $diameter, $diameter, $start, $end, $color2, IMG_ARC_PIE);
      imagefilledarc($im, $centerX, $centerY, $diameter, $diameter, $start, $end, $color1, IMG_ARC_NOFILL|IMG_ARC_EDGED);
    } else {
      imagearc($im, $centerX, $centerY, $diameter, $diameter, $start, $end, $color2);
      imageline($im, $centerX, $centerY, $centerX + cos(deg2rad($start)) * $r, $centerY + sin(deg2rad($start)) * $r, $color2);
      imageline($im, $centerX, $centerY, $centerX + cos(deg2rad($start+1)) * $r, $centerY + sin(deg2rad($start)) * $r, $color2);
      imageline($im, $centerX, $centerY, $centerX + cos(deg2rad($end-1)) * $r, $centerY + sin(deg2rad($end)) * $r, $color2);
      imageline($im, $centerX, $centerY, $centerX + cos(deg2rad($end)) * $r, $centerY + sin(deg2rad($end)) * $r, $color2);
      imagefill($im,$centerX + $r*cos($w)/2, $centerY + $r*sin($w)/2, $color2);
    }
    if ($text) {
      if ($placeindex>0) {
        imageline($im,$centerX + $r*cos($w)/2, $centerY + $r*sin($w)/2,$diameter, $placeindex*12,$color1);
        imagestring($im,4,$diameter, $placeindex*12,$text,$color1);

      } else {
        imagestring($im,4,$centerX + $r*cos($w)/2, $centerY + $r*sin($w)/2,$text,$color1);
      }
    }
  }
  $size = GRAPH_SIZE; // image size
  $image = imagecreate($size+50, $size+10);

  $col_white = imagecolorallocate($image, 0xFF, 0xFF, 0xFF);
  $col_red = imagecolorallocate($image, 0xD0, 0x60, 0x30);
  $col_green = imagecolorallocate($image, 0x60, 0xF0, 0x60);
  $col_black = imagecolorallocate($image, 0, 0, 0);

  imagecolortransparent($image,$col_white);

  switch ($_GET['IMG']){
    case 1: // pie chart
      $tsize=$memcacheStats['limit_maxbytes'];
      $avail=$tsize-$memcacheStats['bytes'];
      $x=$y=$size/2;
      $angle_from = 0;
      $fuzz = 0.000001;

      foreach($memcacheStatsSingle as $serv=>$mcs) {
        $free = $mcs['STAT']['limit_maxbytes']-$mcs['STAT']['bytes'];
        $used = $mcs['STAT']['bytes'];

        if ($free>0){
        // draw free
          $angle_to = ($free*360)/$tsize;
          $perc =sprintf("%.2f%%", ($free *100) / $tsize);

          fill_arc($image,$x,$y,$size,$angle_from,$angle_from + $angle_to ,$col_black,$col_green,$perc);
          $angle_from = $angle_from + $angle_to;
        }
        if ($used>0){
        // draw used
          $angle_to = ($used*360)/$tsize;
          $perc =sprintf("%.2f%%", ($used *100) / $tsize);
          fill_arc($image,$x,$y,$size,$angle_from,$angle_from + $angle_to ,$col_black,$col_red, '('.$perc.')' );
          $angle_from = $angle_from + $angle_to;
        }
        }

    break;

    case 2: // hit miss

      $hits = ($memcacheStats['get_hits']==0) ? 1:$memcacheStats['get_hits'];
      $misses = ($memcacheStats['get_misses']==0) ? 1:$memcacheStats['get_misses'];
      $total = $hits + $misses ;

      fill_box($image, 30,$size,50,-$hits*($size-21)/$total,$col_black,$col_green,sprintf("%.1f%%",$hits*100/$total));
      fill_box($image,130,$size,50,-max(4,($total-$hits)*($size-21)/$total),$col_black,$col_red,sprintf("%.1f%%",$misses*100/$total));
    break;

  }
  header("Content-type: image/png");
  imagepng($image);
  exit;
}

echo getHeader();
echo getMenu();

switch ($_GET['op']) {

  case 1: // host stats
    $phpversion = phpversion();
    $memcacheStats = getMemcacheStats();
    $memcacheStatsSingle = getMemcacheStats(false);

    $mem_size = $memcacheStats['limit_maxbytes'];
    $mem_used = $memcacheStats['bytes'];
    $mem_avail= $mem_size-$mem_used;
    $startTime = time()-array_sum($memcacheStats['uptime']);

    $curr_items = $memcacheStats['curr_items'];
    $total_items = $memcacheStats['total_items'];
    $hits = ($memcacheStats['get_hits']==0) ? 1:$memcacheStats['get_hits'];
    $misses = ($memcacheStats['get_misses']==0) ? 1:$memcacheStats['get_misses'];
    $sets = $memcacheStats['cmd_set'];

    $req_rate = sprintf("%.2f",($hits+$misses)/($time-$startTime));
    $hit_rate = sprintf("%.2f",($hits)/($time-$startTime));
    $miss_rate = sprintf("%.2f",($misses)/($time-$startTime));
    $set_rate = sprintf("%.2f",($sets)/($time-$startTime));

    echo <<< EOB
    <div class="info div1"><h2>General Cache Information</h2>
    <table cellspacing=0><tbody>
    <tr class=tr-1><td class=td-0>PHP Version</td><td>$phpversion</td></tr>
EOB;
    echo "<tr class=tr-0><td class=td-0>Memcached Host". ((count($MEMCACHE_SERVERS)>1) ? 's':'')."</td><td>";
    $i=0;
    if (!isset($_GET['singleout']) && count($MEMCACHE_SERVERS)>1){
      foreach($MEMCACHE_SERVERS as $server){
         echo ($i+1).'. <a href="'.$PHP_SELF.'&singleout='.$i++.'" rel="external nofollow" >'.$server.'</a><br/>';
      }
    }
    else{
      echo '1.'.$MEMCACHE_SERVERS[0];
    }
    if (isset($_GET['singleout'])){
       echo '<a href="'.$PHP_SELF.'" rel="external nofollow" >(all servers)</a><br/>';
    }
    echo "</td></tr>\n";
    echo "<tr class=tr-1><td class=td-0>Total Memcache Cache</td><td>".bsize($memcacheStats['limit_maxbytes'])."</td></tr>\n";

  echo <<<EOB
    </tbody></table>
    </div>

    <div class="info div1"><h2>Memcache Server Information</h2>
EOB;
    foreach($MEMCACHE_SERVERS as $server){
      echo '<table cellspacing=0><tbody>';
      echo '<tr class=tr-1><td class=td-1>'.$server.'</td><td><a href="'.$PHP_SELF.'&server='.array_search($server,$MEMCACHE_SERVERS).'&op=6" rel="external nofollow" >[<b>Flush this server</b>]</a></td></tr>';
      echo '<tr class=tr-0><td class=td-0>Start Time</td><td>',date(DATE_FORMAT,$memcacheStatsSingle[$server]['STAT']['time']-$memcacheStatsSingle[$server]['STAT']['uptime']),'</td></tr>';
      echo '<tr class=tr-1><td class=td-0>Uptime</td><td>',duration($memcacheStatsSingle[$server]['STAT']['time']-$memcacheStatsSingle[$server]['STAT']['uptime']),'</td></tr>';
      echo '<tr class=tr-0><td class=td-0>Memcached Server Version</td><td>'.$memcacheStatsSingle[$server]['STAT']['version'].'</td></tr>';
      echo '<tr class=tr-1><td class=td-0>Used Cache Size</td><td>',bsize($memcacheStatsSingle[$server]['STAT']['bytes']),'</td></tr>';
      echo '<tr class=tr-0><td class=td-0>Total Cache Size</td><td>',bsize($memcacheStatsSingle[$server]['STAT']['limit_maxbytes']),'</td></tr>';
      echo '</tbody></table>';
    }
  echo <<<EOB

    </div>
    <div class="graph div3"><h2>Host Status Diagrams</h2>
    <table cellspacing=0><tbody>
EOB;

  $size='width='.(GRAPH_SIZE+50).' height='.(GRAPH_SIZE+10);
  echo <<<EOB
    <tr>
    <td class=td-0>Cache Usage</td>
    <td class=td-1>Hits &amp; Misses</td>
    </tr>
EOB;

  echo
    graphics_avail() ?
       '<tr>'.
       "<td class=td-0><img alt=\"\" $size src=\"$PHP_SELF&IMG=1&".(isset($_GET['singleout'])? 'singleout='.$_GET['singleout'].'&':'').."$time\"></td>".
       "<td class=td-1><img alt=\"\" $size src=\"$PHP_SELF&IMG=2&".(isset($_GET['singleout'])? 'singleout='.$_GET['singleout'].'&':'')."$time\"></td></tr>\n"
      : "",
    '<tr>',
    '<td class=td-0><span class="green box">&nbsp;</span>Free: ',bsize($mem_avail).sprintf(" (%.1f%%)",$mem_avail*100/$mem_size),"</td>\n",
    '<td class=td-1><span class="green box">&nbsp;</span>Hits: ',$hits.sprintf(" (%.1f%%)",$hits*100/($hits+$misses)),"</td>\n",
    '</tr>',
    '<tr>',
    '<td class=td-0><span class="red box">&nbsp;</span>Used: ',bsize($mem_used ).sprintf(" (%.1f%%)",$mem_used *100/$mem_size),"</td>\n",
    '<td class=td-1><span class="red box">&nbsp;</span>Misses: ',$misses.sprintf(" (%.1f%%)",$misses*100/($hits+$misses)),"</td>\n";
    echo <<< EOB
  </tr>
  </tbody></table>
<br/>
  <div class="info"><h2>Cache Information</h2>
    <table cellspacing=0><tbody>
    <tr class=tr-0><td class=td-0>Current Items(total)</td><td>$curr_items ($total_items)</td></tr>
    <tr class=tr-1><td class=td-0>Hits</td><td>{$hits}</td></tr>
    <tr class=tr-0><td class=td-0>Misses</td><td>{$misses}</td></tr>
    <tr class=tr-1><td class=td-0>Request Rate (hits, misses)</td><td>$req_rate cache requests/second</td></tr>
    <tr class=tr-0><td class=td-0>Hit Rate</td><td>$hit_rate cache requests/second</td></tr>
    <tr class=tr-1><td class=td-0>Miss Rate</td><td>$miss_rate cache requests/second</td></tr>
    <tr class=tr-0><td class=td-0>Set Rate</td><td>$set_rate cache requests/second</td></tr>
    </tbody></table>
    </div>

EOB;

  break;

  case 2: // variables

    $m=0;
    $cacheItems = getCacheItems();
    $items = $cacheItems['items'];
    $totals = $cacheItems['counts'];
    $maxDump = MAX_ITEM_DUMP;
    foreach($items as $server => $entries) {

    echo <<< EOB

      <div class="info"><table cellspacing=0><tbody>
      <tr><th colspan="2">$server</th></tr>
      <tr><th>Slab Id</th><th>Info</th></tr>
EOB;

      foreach($entries as $slabId => $slab) {
        $dumpUrl = $PHP_SELF.'&op=2&server='.(array_search($server,$MEMCACHE_SERVERS)).'&dumpslab='.$slabId;
        echo
          "<tr class=tr-$m>",
          "<td class=td-0><center>",'<a href="',$dumpUrl,'" rel="external nofollow" >',$slabId,'</a>',"</center></td>",
          "<td class=td-last><b>Item count:</b> ",$slab['number'],'<br/><b>Age:</b>',duration($time-$slab['age']),'<br/> <b>Evicted:</b>',((isset($slab['evicted']) && $slab['evicted']==1)? 'Yes':'No');
          if ((isset($_GET['dumpslab']) && $_GET['dumpslab']==$slabId) && (isset($_GET['server']) && $_GET['server']==array_search($server,$MEMCACHE_SERVERS))){
            echo "<br/><b>Items: item</b><br/>";
            $items = dumpCacheSlab($server,$slabId,$slab['number']);
            // maybe someone likes to do a pagination here :)
            $i=1;
            foreach($items['ITEM'] as $itemKey=>$itemInfo){
              $itemInfo = trim($itemInfo,'[ ]');

              echo '<a href="',$PHP_SELF,'&op=4&server=',(array_search($server,$MEMCACHE_SERVERS)),'&key=',base64_encode($itemKey).'" rel="external nofollow" >',$itemKey,'</a>';
              if ($i++ % 10 == 0) {
                echo '<br/>';
              }
              elseif ($i!=$slab['number']+1){
                echo ',';
              }
            }
          }

          echo "</td></tr>";
        $m=1-$m;
      }
    echo <<<EOB
      </tbody></table>
      </div><hr/>
EOB;
}
    break;

  break;

  case 4: //item dump
    if (!isset($_GET['key']) || !isset($_GET['server'])){
      echo "No key set!";
      break;
    }
    // I'm not doing anything to check the validity of the key string.
    // probably an exploit can be written to delete all the files in key=base64_encode("\n\r delete all").
    // somebody has to do a fix to this.
    $theKey = htmlentities(base64_decode($_GET['key']));

    $theserver = $MEMCACHE_SERVERS[(int)$_GET['server']];
    list($h,$p) = explode(':',$theserver);
    $r = sendMemcacheCommand($h,$p,'get '.$theKey);
    echo <<<EOB
    <div class="info"><table cellspacing=0><tbody>
      <tr><th>Server<th>Key</th><th>Value</th><th>Delete</th></tr>
EOB;
    echo "<tr><td class=td-0>",$theserver,"</td><td class=td-0>",$theKey,
       " <br/>flag:",$r['VALUE'][$theKey]['stat']['flag'],
       " <br/>Size:",bsize($r['VALUE'][$theKey]['stat']['size']),
       "</td><td>",chunk_split($r['VALUE'][$theKey]['value'],40),"</td>",
       '<td><a href="',$PHP_SELF,'&op=5&server=',(int)$_GET['server'],'&key=',base64_encode($theKey)," rel="external nofollow" \">Delete</a></td>","</tr>";
    echo <<<EOB
      </tbody></table>
      </div><hr/>
EOB;
  break;
  case 5: // item delete
    if (!isset($_GET['key']) || !isset($_GET['server'])){
      echo "No key set!";
      break;
    }
    $theKey = htmlentities(base64_decode($_GET['key']));
    $theserver = $MEMCACHE_SERVERS[(int)$_GET['server']];
    list($h,$p) = explode(':',$theserver);
    $r = sendMemcacheCommand($h,$p,'delete '.$theKey);
    echo 'Deleting '.$theKey.':'.$r;
  break;

  case 6: // flush server
    $theserver = $MEMCACHE_SERVERS[(int)$_GET['server']];
    $r = flushServer($theserver);
    echo 'Flush '.$theserver.":".$r;
  break;
}
echo getFooter();

?>

This is the end of this article about the detailed explanation of Mencached cache configuration based on Nginx. For more relevant Nginx Mencached cache configuration content, please search for previous articles on 123WORDPRESS.COM or continue to browse the following related articles. I hope everyone will support 123WORDPRESS.COM in the future!

You may also be interested in:
  • Detailed explanation of setting resource cache in nginx
  • Nginx content cache and common parameter configuration details
  • Nginx cache files and dynamic files automatic balancing configuration script
  • How to set up static files on the nginx cache server
  • How to handle Nginx and browser cache
  • How to enable proxy_cache in Nginx
  • Speed ​​up nginx performance: enable gzip and cache
  • How to configure caching of static files in nginx
  • Nginx cache and error page configuration
  • Analysis of cache configuration points when Nginx server acts as a reverse proxy

Introduction

Memcached is a distributed caching system. Memcached lacks authentication and security controls, which means that the memcached server should be placed behind a firewall. The memcached API uses a thirty-two-bit cyclic redundancy check (CRC-32) to calculate the key value and then distributes the data across different machines. When the table is full, the newly added data will be replaced using the LRU mechanism. Since memcached is usually used only as a cache system, applications using memcached need additional code to update the data in memcached when writing back to a slower system (such as a backend database).

feature

Memcached is a high-speed distributed cache server with the following features:

  • Simple protocol
  • Event processing based on libevent
  • Built-in memory storage method
  • Distributed memcached do not communicate with each other

Preliminary preparation

Prepare three Centos7 virtual machines, configure IP addresses and hostnames, turn off firewalls and selinux, synchronize system time, and modify IP address and hostname mappings

ip hostname
192.168.29.132 master
192.168.29.138 bak
192.168.29.133 mid

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