Varnish是一款高性能的开源HTTP加速器，下面给大家介绍如何在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