Varnish是一款高性能的開源HTTP加速器，挪威最大的在線報紙Verdens Gang (http://www.vg.no) 使用3臺Varnish代替了原來的12臺squid，性能居然比以前更好。可見Varnish是一個相當強大的加速器。下面羅伊給大家介紹如何在 CentOS上安裝Varnish來給你的WordPress博客加速。

　　1，安裝Varnsih

　　使用SSH登錄你的VPS，執行下面的命令來安裝Varnish：

　　yum install varnish

　　然后我們啟動Varnish：

　　/etc/init.d/varnish start

　　設置為開機啟動：

　　chkconfig –level 345 varnish on

　　2，配置Varnish

　　打開default.vcl：

　　nano /etc/varnish/default.vcl

　　確認默認的default.vcl和下面的代碼相匹配：

　　# 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"; } 重啟Varnish使其生效： /etc/init.d/varnish restart