Installing Varnish & Configuring it for Wordpress On Centos

[Ifirst]

In this tutorial i am going to teach you how to install varnish and configuring it for wordpress on a Centos server.
What is needed for this work:
1.SSH access to your server

Connect to your server via your SSH client and execute the following commands
First we install varnish on the machine

yum install varnish

Next we start the service

/etc/init.d/varnish start

Make sure that varnish is automatically started on server reboot

chkconfig --level 345 varnish on

Open default.vcl

nano /etc/varnish/default.vcl

Make sure you default.vcl matches exactly the one shown below.

# 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|pdf|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|pdf|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";
}

Finally you restart vanish for changes to take effect

/etc/init.d/varnish restart

All done , your websites are now accelerated by varnish