AMH面板安装配置redis加速WordPress站点
Redis是一个开源、支持网络、基于内存的key-value存储系统,类似memcached,性能极高,支持超过100K+ 每秒的读写频率,一些大型的网站例如ITeye(JavaEye)和CSDN现在都用到了Redis。
与memcached相比,Redis提供了持久化存储,重启了服务器后memcached需要重新创建缓存,而Redis依赖快照进行持久化,即使服务器刚开机启动也不会导致负载陡增。Redis缓存比较适合大流量的Wordpress。
当你的WordPress中的文章达到上万篇,随着流量的增加,Wordpress的服务器压力也随之不断加大,Wordpress发布文章和后台相关的操作都会变得缓慢,这时如果单从硬件上投入来提高Wordpress性能显然不划算。
利用Redis将WordPress页面直接缓存在服务器的内存中,这样在避免了PHP重复执行操作的同时,内存的极速响应能够最大限度地提升Wordpress页面的访问速度,实际测试发现页面执行时间可以降低到0.00X秒级别,比没有使用Redis缓存提升几倍甚至十几倍以上。
用Redis缓存来给WordPress站点加速-适用于Apache和Nginx。
一、AMH面板上安装redis插件
如果你使用的不是AMH面板就使用SSH进行安装redis,在AMH面板需要安装redis+pecl_redis两个软件(支持PHP7),pecl_redis是AMH面板Redis软件的php环境扩展模块。下载安装好后,在应用软件中点击pecl_redis后面的管理,选择需要缓存的环境,安装即可。
二、用Predis.php作为Redis的PHP客户端
1、我们可以使用Predis.php来作为PHP客户端,直接将Predis.php下载并上传到Wordpress的根目录下,CD到Wordpress根目录,执行以下命令:
- wget http://uploads.staticjw.com/ji/jim/predis.php
2、这是Predis.php的备份下载:Predis.php下载,手动下载并上传WordPress网站根目录下。
三、安装Redis前端缓存的PHP脚本
1、Redis前端缓存的PHP脚本来自:http://www.jimwestergren.com/wordpress-with-redis-as-a-frontend-cache/,为优化后的版本
- <?php
- /*
- author: jeedo aquino
- file: wp-index-redis.php
- credit: jim westergren
- updated: 2012-10-23
- this is a redis caching system for wordpress inspired by jim westergren.
- see more here: www.jimwestergren.com/wordpress-with-redis-as-a-frontend-cache/
- some caching mechanics are different from jim's script which is summarized below:
- - cached pages do not expire not unless explicitly deleted or reset
- - appending a ?c=y to a url deletes the entire cache of the domain, only works when you are logged in
- - appending a ?r=y to a url deletes the cache of that url
- - script still works even if allow_fopen is disabled
- - submitting a comment deletes the cache of that page
- - refreshing (f5) a page deletes the cache of that page
- - includes a debug mode, stats are displayed at the bottom most part after
- for setup and configuration see more here:
- www.jeedo.net/lightning-fast-wordpress-with-nginx-redis/
- use this script at your own risk. i currently use this albeit a slightly modified version
- to display a redis badge whenever a cache is displayed.
- */
- // change vars here
- $cf = 0; // set to 1 if you are using cloudflare
- $debug = 0; // set to 1 if you wish to see execution time and cache actions
- $display_powered_by_redis = 0; // set to 1 if you want to display a powered by redis message with execution time, see below
- $start = microtime(); // start timing page exec
- // if cloudflare is enabled
- if ($cf) {
- if (isset($_SERVER['HTTP_CF_CONNECTING_IP'])) {
- $_SERVER['REMOTE_ADDR'] = $_SERVER['HTTP_CF_CONNECTING_IP'];
- }
- }
- // from wp
- define('WP_USE_THEMES', true);
- // init predis
- include("predis.php");
- $redis = new Predis\Client('');
- // init vars
- $domain = $_SERVER['HTTP_HOST'];
- $url = "http://".$_SERVER['HTTP_HOST'].$_SERVER['REQUEST_URI'];
- $url = str_replace('?r=y', '', $url);
- $url = str_replace('?c=y', '', $url);
- $dkey = md5($domain);
- $ukey = md5($url);
- // check if page isn't a comment submission
- (($_SERVER['HTTP_CACHE_CONTROL'] == 'max-age=0') ? $submit = 1 : $submit = 0);
- // check if logged in to wp
- $cookie = var_export($_COOKIE, true);
- $loggedin = preg_match("/wordpress_logged_in/", $cookie);
- // check if a cache of the page exists
- if ($redis->hexists($dkey, $ukey) && !$loggedin && !$submit) {
- echo $redis->hget($dkey, $ukey);
- if (!$debug) exit(0);
- $msg = 'this is a cache';
- // if a comment was submitted or clear page cache request was made delete cache of page
- } else if ($submit || substr($_SERVER['REQUEST_URI'], -4) == '?r=y') {
- require('./wp-blog-header.php');
- $redis->hdel($dkey, $ukey);
- $msg = 'cache of page deleted';
- // delete entire cache, works only if logged in
- } else if ($loggedin && substr($_SERVER['REQUEST_URI'], -4) == '?c=y') {
- require('./wp-blog-header.php');
- if ($redis->exists($dkey)) {
- $redis->del($dkey);
- $msg = 'domain cache flushed';
- } else {
- $msg = 'no cache to flush';
- }
- // if logged in don't cache anything
- } else if ($loggedin) {
- require('./wp-blog-header.php');
- $msg = 'not cached';
- // cache the page
- } else {
- // turn on output buffering
- ob_start();
- require('./wp-blog-header.php');
- // get contents of output buffer
- $html = ob_get_contents();
- // clean output buffer
- ob_end_clean();
- echo $html;
- // store html contents to redis cache
- $redis->hset($dkey, $ukey, $html);
- $msg = 'cache is set';
- }
- $end = microtime(); // get end execution time
- // show messages if debug is enabled
- if ($debug) {
- echo $msg.': ';
- echo t_exec($start, $end);
- }
- // time diff
- function t_exec($start, $end) {
- $t = (getmicrotime($end) - getmicrotime($start));
- return round($t,5);
- }
- // get time
- function getmicrotime($t) {
- list($usec, $sec) = explode(" ",$t);
- return ((float)$usec + (float)$sec);
- }
- ?>
2、 你也可以直接点击备用下载:index-with-redis.php下载地址,再上传到WordPress根目录下。
3、 如果你正在使用cloudflare,请设置cf = 1; ,如果你想在页面上看到脚本执行时间和缓存加载时间,请设置$debug = 1; display_powered_by_redis = 1表示显示powered_by信息。
4、将index-with-redis.php上传到Wordpress的根目录,如果你使用的是nginx,重命令原来的index.php为任意其它名字,把index-with-redis.php重命名为index.php。
5、如果你使用的是Apache,则需要把.htaccess中出现的index.php替换成index-with-redis.php。
6、所有的操作完成后,你就可以刷新一下Wordpress页面,查看Redis缓存效果了。
四、Wordpress删除Redis页面缓存的方法
1、删除某一个页面的缓存:发表评论、按下F5刷新、在URL后面加上?r=y回车。
2、删除整站页面缓存:登录到Wordpress后台,在任意URL后面加上?r=y回车。
3、更新文章时自动刷新首页缓存:在你的Wordpress的Function.php中加入以下代码
- function newPostRefresh() {
- $temp=file_get_contents("http://xxxxxxx/?r=y"); //xxxxxx自己替换
- }
- add_action('publish_post', 'newPostRefresh');
- add_action('edit_post', 'newPostRefresh');
- add_action('delete_post', 'newPostRefresh');
- add_action('comment_post', 'newPostRefresh');
- add_action('edit_comment', 'newPostRefresh');
- add_action('delete_comment', 'newPostRefresh');
- add_action('wp_set_comment_status', 'newPostRefresh');
- add_action('switch_theme', 'newPostRefresh');
4、自动更新Wordpress缓存:在crontab中配置每10分钟用curl访问首页更新缓存,每天凌晨对首页或者分类页面进行更新,AMH可以安装amcrontab软件来进行设置。
- */10 * * * * curl http://www.freehao123.com/?r=y
- 1 1 * * * curl http://www.freehao123.com/fenye/?r=y
五、Wordpress Redis缓存使用小结
Wordpress Redis缓存加速效果无疑是明显的,特别页面多访问大的网站博客,在使用Wordpress Redis缓存加速时请禁止其它的所有缓存插件,以免造成不必要的冲突。经过测试Wordpress Redis缓存在使用过程中主要存在的问题就是文章更新时,相应的Tag和分类、首页等内容不会实时更新,我们需要手动更新或者利用自动更新命令。
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