= install Varnish on CentOS

> wget http://superb-west.dl.sourceforge.net/sourceforge/varnish/varnish-2.0.4.tar.gz
> tar zxvf varnish-2.0.4.tar.gz
> cd varnish-2.0.4
> ./configure
> make
> make install
> cp redhat/varnish.initrc /etc/init.d/varnish



> vi /usr/local/etc/varnish/de
> sed -i -e 's:exec="/usr/sbin/varnishd":exec="/usr/local/sbin/varnishd":' /etc/init.d/varnis
> cp redhat/varnish.sysconfig /etc/sysconfig/varnish
> groupadd -r varnish
> useradd -r -g varnish -d /var/lib/varnish -s /sbin/nologin -c "Varnish http accelerator user" varnish

> chkconfig --add varnish
> chkconfig --level 345 varnish on
> mkdir /var/lib/varnish

> vi /etc/sysconfig/varnish
DAEMON_OPTS="-a :80 \
             -T localhost:6082 \
             -f /usr/local/etc/varnish/default.vcl \
             -u varnish -g varnish \
             -s file,/var/lib/varnish/varnish_storage.bin,1G"


> vi /usr/local/etc/varnish/default.vcl


backend wwwA {
  .host = "192.168.10.2";
  .probe = {
                .url = "/";
                .interval = 5s;
                .timeout = 1 s;
                .window = 5;
                .threshold = 3;
  }
}

backend wwwB {
  .host = "192.168.10.3";
  .probe = {
                .url = "/";
                .interval = 5s;
                .timeout = 1 s;
                .window = 5;
                .threshold = 3;
  }
}


director wwwL round-robin {
        {
                .backend = wwwA;
        }
        {
                .backend = wwwB;
        }
}

sub vcl_recv {
   if (req.http.host ~ "^(www.)?test.com$") {
       set req.backend = wwwL;
   }
}