Until now we've been running with Varnish on a high port, for testing purposes. You probably don't want to do this in the long term so let's put Varnish on port 80.
First we stop varnish:
# service varnish stop
Now we need to edit the configuration file that starts Varnish.
On Debian/Ubuntu this is /etc/default/varnish. In the file you'll find some text that looks like this:
DAEMON_OPTS="-a :6081 \
-T localhost:6082 \
-f /etc/varnish/default.vcl \
-S /etc/varnish/secret \
-s malloc,256m"
Change it to:
DAEMON_OPTS="-a :80 \
-T localhost:6082 \
-f /etc/varnish/default.vcl \
-S /etc/varnish/secret \
-s malloc,256m"
On Red Hat EL / Centos On Red Hat/Centos it is /etc/sysconfig/varnish
Once the change is done. Restart varnish: service varnish restart. Now everyone accessing your site will be accessing through Varnish.