[audio:http://media.jybb.me/music/%E9%99%88%E5%A5%95%E8%BF%85%20-%20%E4%B8%80%E4%B8%9D%E4%B8%8D%E6%8C%82.mp3|autostart=yes]

本文翻译自http://rtcamp.com/tutorials/nginx-wordpress-fastcgi_cache-with-conditional-purging/ ，有修改

与其让复杂的像wordpress那样的PHP-Mysql应用去做缓存这类的额外工作，倒不如让轻量级的Nginx去缓存WordPress内容。

Nginx内置FastCgi缓存，但是不支持自动清除缓存。当你在wordpress里面新建/修改一篇文章，或者访客提交评论的时候，自动清空相关的缓存是必要的！

 

配置自动清空缓存的步骤很简单：

1、检查是否安装ngx_purge_cache模块

nginx -V 2>&1 | grep nginx-cache-purge -o

如果显示nginx-cache-purge即代表已安装

如果没东西输出，则需要先安装：

sudo add-apt-repository ppa:brianmercer/nginx
sudo apt-get update
sudo apt-get install nginx-custom

*注意：原文的方法仅适用于Debian/Ubuntu 用apt-get方式安装的nginx

如果你用的是lnmp.org的一键包，按以下步骤安装

mkdir /home/cache/wpcache -p
cd ~
./lnmp stop
apt-get install git -y #centos用yum install git -y
git clone https://github.com/FRiCKLE/ngx_cache_purge
wget http://soft.vpser.net/web/nginx/nginx-1.0.15.tar.gz
tar zxvf nginx-1.0.15.tar.gz
cd nginx-1.0.15/
./configure --user=www --group=www --prefix=/usr/local/nginx --with-http_stub_status_module --with-http_ssl_module --with-http_gzip_static_module --with-ipv6 --add-module=../ngx_cache_purge
make
make install
/root/lnmp start

2、安装Nginx Helper插件（在wordpress后台搜索安装即可）

启用插件后，配置下插件（如下图）

3、修改nginx.conf （apt-get安装的在/etc/nginx/nginx.conf，lnmp.org的一键包在/usr/local/nginx/conf/nginx.conf，其他的自行搜索 find / -name nginx.conf）

#在http层添加以下三行代码
fastcgi_cache_path /home/cache/wpcache levels=1:2 keys_zone=wpcache:10m inactive=20m;
fastcgi_cache_key "$scheme$request_method$host$request_uri";
fastcgi_cache_use_stale error timeout invalid_header http_500;

#wpcache为名字，可以随便修改。10m为内存占用

4、修改位于vhost文件夹下的example.com.conf（注意要把example.com全部替换成你的域名）

log_format  example.com  '$remote_addr - $remote_user [$time_local] $request '
             '$status $body_bytes_sent $http_referer '
             '$http_user_agent $http_x_forwarded_for';
 server {
	server_name example.com www.example.com;     

	access_log   /home/wwwlogs/example.com.access.log;
	error_log    /home/wwwlogs/example.com.error.log;

	root /home/wwwroot/example.com;
        include wordpress.conf;
	index index.php;

	set $no_cache 0;

	# 不缓存POST操作
	if ($request_method = POST) {
		set $no_cache 1;
	}   
	if ($query_string != "") {
		set $no_cache 1;
	}   

	# 不缓存后台
	if ($request_uri ~* "(/wp-admin/|/xmlrpc.php|/wp-(app|cron|login|register|mail).php|wp-.*.php|/feed/|index.php|wp-comments-popup.php|wp-links-opml.php|wp-locations.php|sitemap(_index)?.xml|[a-z0-9_-]+-sitemap([0-9]+)?.xml)") {
		set $no_cache 1;
	}   

	# 已登录的不缓存（防止留言串号）
	if ($http_cookie ~* "comment_author|wordpress_[a-f0-9]+|wp-postpass|wordpress_no_cache|wordpress_logged_in") {
		set $no_cache 1;
	}

	location / {
		try_files $uri $uri/ /index.php?$args;
	}    

	location ~ .php$ {
		try_files $uri /index.php; 
		include fastcgi_params;        #Lnmp.org一键包改成include fcgi.conf;
		fastcgi_pass unix:/var/run/php5-fpm.sock;     #Lnmp.org一键包改成fastcgi_pass  unix:/tmp/php-cgi.sock;

		fastcgi_cache_bypass $no_cache;
	        fastcgi_no_cache $no_cache;

		fastcgi_cache wpcache;    #要跟前面设置的名称一样
		fastcgi_cache_valid  30m;   #缓存时间
	}

	location ~ /purge(/.*) {
            allow 11.22.33.44;  #此处该为你vps的ip
            allow 8.8.8.8;
            allow 127.0.0.1;
            deny all;
	    fastcgi_cache_purge wpcache "$scheme$request_method$host$1";
	}	

	location ~* ^.+\.(ogg|ogv|svg|svgz|eot|otf|woff|mp4|ttf|rss|atom|jpg|jpeg|gif|png|ico|zip|tgz|gz|rar|bz2|doc|xls|exe|ppt|tar|mid|midi|wav|bmp|rtf)$ {
		access_log off;	log_not_found off; expires max;
	}

	location = /favicon.php { access_log off; log_not_found off; }
	location = /robots.txt { access_log off; log_not_found off; }
	location ~ /\. { deny  all; access_log off; log_not_found off; }
}

4、重启Nginx即可

/etc/init.d/nginx restart