使用Nginx缓存加速WordPress站点

博客开通以来，主要记录学习和使用过程中遇到的问题及解决方案。文章风格偏向自娱自乐，因此访问量较少，一台1核1G的vps足以支撑网站的正常运行。

本人是Google的重度使用者，如果设备无法连上Google，情况之糟糕无异于断网。因为这个原因，本人对各种科学上网技术均稍有涉猎和研究。为了方便自用以及帮助有同样需求的网友，本站提供 Shadowsocks/SS客户端 、 ShadowsocksR/SSR客户端 和 V2Ray客户端 的本地托管下载。

这三个页面应该对有上外网需求的网友很有帮助，也给本站带来了很大的流量。本站用的WordPress程序，尝试过安装各种缓存插件（super cache, w3 total cache等）加速运行，但是低配的vps依然难以支持这么大的访问量。通过日志可以看到随着访问量的增加，php-fpm进程增多，Mysql的连接和线程增多，接着出现OOM，然后系统kill掉占用内存最大的Mysql进程，于是网站进入503宕机模式。

买更好的vps能解决访问量大的问题，但是要花更多的钱。做为一个技术宅，首先想到的当然是如何榨干现有机器来支撑大流量。做过的尝试包括切换到比WordPress性能更好的Ghost，参考：尝试Ghost 。但是相对于WordPress，Ghost的生态远没有那么成熟，最终放弃了。

左思右想下，终极解决办法是用Nginx缓存，最初的文章可参考：Nginx配置fastcgi cache。fastcgi_cache的好处是大部分用户的请求不用后端php-fpm打交道，直接发送缓存的静态页面，速度上甩各种WordPress插件好几条街！相比之下wordpress的各种插件还要执行php，也避免不了访问数据库，弱爆了！

自从使用了nginx缓存，网站平稳运行，再也没有出现过宕机的现象。同时vps的cpu和内存占用率直线下降，再也无需担心vps的配置问题，感觉再来10倍流量博客也撑得住！

因为nginx稳如狗的体验，所以现在对于博客类读多写少的产品都是强推nginx缓存（fastcgi缓存或者proxy缓存）。鉴于可能帮到一些网友，现贴出 /etc/nginx/nginx.conf  配置文件供网友参考（包含ssl设置和gzip部分）：

# 文件： /etc/nginx/nginx.conf # For more information on configuration, see: #   * Official English Documentation: http://nginx.org/en/docs/ #   * Official Russian Documentation: http://nginx.org/ru/docs/  user nginx; worker_processes auto; error_log /var/log/nginx/error.log; pid /run/nginx.pid;  # Load dynamic modules. See /usr/share/nginx/README.dynamic. include /usr/share/nginx/modules/*.conf;  events {     worker_connections 1024; }  http {     log_format  main  '$remote_addr - $remote_user [$time_local] "$request" '                       '$status $body_bytes_sent "$http_referer" '                       '"$http_user_agent" "$http_x_forwarded_for" "$request_time"';      access_log  /var/log/nginx/access.log  main buffer=32k flush=30s;      server_tokens       off;     client_max_body_size 100m;      sendfile            on;     tcp_nopush          on;     tcp_nodelay         on;     keepalive_timeout   65;     types_hash_max_size 2048;      include             /etc/nginx/mime.types;     default_type        application/octet-stream;      # ssl配置     ssl_protocols TLSv1.2 TLSv1.3;     ssl_ciphers ECDHE-RSA-AES256-GCM-SHA512:DHE-RSA-AES256-GCM-SHA512:ECDHE-RSA-AES256-GCM-SHA384:DHE-RSA-AES256-GCM-SHA384:ECDHE-RSA-AES256-SHA384;     ssl_ecdh_curve secp384r1;     ssl_prefer_server_ciphers on;     ssl_session_cache shared:SSL:10m;     ssl_session_timeout 10m;     ssl_session_tickets off;     ssl_stapling on; # Requires nginx >= 1.3.7     ssl_stapling_verify on; # Requires nginx => 1.3.7     add_header Strict-Transport-Security "max-age=63072000; preload";     #add_header X-Frame-Options DENY;     add_header X-Frame-Options SAMEORIGIN;     add_header X-Content-Type-Options nosniff;     add_header X-XSS-Protection "1; mode=block";      # 请按照自己的需求更改     fastcgi_cache_path /var/cache/nginx/tlanyan levels=1:2 keys_zone=tlanyan:10m inactive=30m use_temp_path=off;      fastcgi_cache_key $request_method$scheme$host$request_uri;     # note: can also use HTTP headers to form the cache key, e.g.     #fastcgi_cache_key $scheme$request_method$host$request_uri$http_x_custom_header;     #fastcgi_cache_lock on;     fastcgi_cache_use_stale error timeout invalid_header updating http_500;     fastcgi_cache_valid 200 301 302 10h;     fastcgi_cache_valid 404 10m;     fastcgi_ignore_headers Expires Set-Cookie Vary;      # gzip 配置     gzip on;     gzip_min_length  1k;     gzip_buffers     4 16k;     gzip_comp_level 7;     gzip_types         text/css         text/plain         text/javascript         application/javascript         application/json         application/x-javascript         application/xml         application/xml+rss         application/xhtml+xml         application/x-font-ttf         application/x-font-opentype         application/vnd.ms-fontobject         image/svg+xml         image/x-icon         application/rss+xml         application/atom_xml         image/jpeg         image/gif         image/png         image/icon         image/bmp         image/jpg;     gzip_vary on;      # Load modular configuration files from the /etc/nginx/conf.d directory.     # See http://nginx.org/en/docs/ngx_core_module.html#include     # for more information.     include /etc/nginx/conf.d/*.conf; }

以及用于WordPress站点的网站配置文件（/etc/nginx/conf.d/tlanyan.conf）:

server {     listen 80;     listen [::]:80;     server_name www.tlanyan.me tlanyan.me; # 请换成自己的域名     rewrite ^(.*) https://$server_name$1 permanent; }  server {     listen       443 ssl http2;     listen       [::]:443 ssl http2;     server_name www.tlanyan.me tlanyan.me; # 请换成自己的域名     charset utf-8;     ssl_certificate /etc/nginx/conf.d/tlanyan.pem;  # 请换成自己的证书和密钥     ssl_certificate_key /etc/nginx/conf.d/tlanyan.key;      set $host_path "/var/www/tlanyan";  # 请改成自己的路径     access_log  /var/log/nginx/tlanyan.access.log  main buffer=32k flush=30s;     error_log /var/log/nginx/tlanyan.error.log;      root   $host_path;      # 缓存标记     set $skip_cache 0;     if ($query_string != "") {         set $skip_cache 1;     }     if ($request_uri ~* "/wp-admin/|/xmlrpc.php|wp-.*.php|/feed/|sitemap(_index)?.xml") {         set $skip_cache 1;     }     # 登录用户或发表评论者     if ($http_cookie ~* "comment_author|wordpress_[a-f0-9]+|wp-postpass|wordpress_no_cache|wordpress_logged_in") {         set $skip_cache 1;     }      location = / {         index  index.php index.html;         try_files /index.php?$args /index.php?$args;     }      location / {         index  index.php index.html;         try_files $uri $uri/ /index.php?$args;     }     location ~ ^//.user/.ini {             deny all;     }      location ~ /.php$ {         try_files $uri =404;         fastcgi_index index.php;         fastcgi_pass   127.0.0.1:9000;         fastcgi_cache tlanyan;         fastcgi_cache_valid 200 301 302 30m;         fastcgi_cache_valid 404 10m;         fastcgi_cache_bypass $skip_cache;         fastcgi_no_cache $skip_cache;         fastcgi_cache_lock on;         include fastcgi_params;         fastcgi_param  SCRIPT_FILENAME  $document_root$fastcgi_script_name;     }     location ~ /.(js|css|png|jpg|gif|swf|ico|pdf|mov|fla|zip|rar|jpeg)$ {         expires max;         access_log off;         try_files $uri =404;     } }

上述配置对最新版的Nginx测试有效，详细配置指令请参考Nginx官方文档。