Varnish是一款高性能的开源HTTP加速器，挪威最大的在线报纸Verdens Gang (//wsw.vg.no) 使用3台Varnish代替了原来的12台squid，性能居然比以前更好。可见Varnish是一个相当强大的加速器。下面罗伊给大家介绍如何在 CentOS上安装Varnish来给你的WordPress博客加速。
1，安装Varnsih
使用SSH登录你的VPS，执行下面的命令来安装Varnish：
yum install varnish
然后我们启动Varnish：
/etc/init.d/varnish start
设置为开机启动：
chkconfig –level 345 varnish on
2，配置Varnish
打开default.vcl：
nano /etc/varnish/default.vcl
确认默认的default.vcl和下面的代码相匹配：
# Back-End backend default { .host = "127.0.0.1"; .port = "80"; .connect_timeout = 60s; .first_byte_timeout = 10s; .between_bytes_timeout = 10s; } # Custom sub vcl_recv { remove req.http.X-Forwarded-For; set req.http.X-Forwarded-For = client.ip; if (req.url ~ "^/wp-(login|admin)") { return (pipe); } if (req.http.Cookie ~"(wp-postpass|wordpress_logged_in|comment_author_)") { return (pipe); } if (req.request == "POST") { return (pass); } if (req.http.Cache-Control ~ "no-cache") { return (pass); } if (req.http.Authorization) { return (pass); } if (req.url ~ ".(jpg|jpeg|gif|png|ico|css|zip|tgz|gz|rar|bz2|pd f|txt|tar|wav|bmp|rtf|js|flv|swf|htm|html)$") { unset req.http.Cookie; unset req.http.Accept-Encoding; unset req.http.Vary; return (lookup); } if (req.http.Accept-Encoding) { if (req.url ~ ".(jpg|png|gif|gz|tgz|bz2|tbz|mp3|ogg)$") { remove req.http.Accept-Encoding; } elsif (req.http.Accept-Encoding ~ "gzip") { set req.http.Accept-Encoding = "gzip"; } elsif (req.http.Accept-Encoding ~ "deflate") { set req.http.Accept-Encoding = "deflate"; } else { remove req.http.Accept-Encoding; } } if (req.backend.healthy) { set req.grace = 30s; } else { set req.grace = 1h; } unset req.http.Cookie; unset req.http.Vary; return (lookup); } sub vcl_fetch { set beresp.grace = 1h; unset beresp.http.set-cookie; if (req.url ~ ".(jpg|jpeg|gif|png|ico|css|zip|tgz|gz|rar|bz2|pd f|txt|tar|wav|bmp|rtf|js|flv|swf|htm|html)$") { set beresp.ttl = 24h; } else { set beresp.ttl = 5m; } return (deliver); } sub vcl_deliver { if(obj.hits > 0) { set resp.http.X-Cache = "HIT"; } else { set resp.http.X-Cache = "MISS"; } set resp.http.Cache-Control = "private"; set resp.http.Pragma = "private"; remove resp.http.X-Varnish; remove resp.http.Via; remove resp.http.Age; remove resp.http.Server; remove resp.http.X-Powered-By; } sub vcl_pipe { set bereq.http.connection = "close"; } 重启Varnish使其生效： /etc/init.d/varnish restart