When using systemd its hard to change the port varnish listens on. In our
case we want it to listen on port 80.
You have to edit /lib/systemd/system/varnish.service as all other config
options I found are simply ignored.
In addition on update of the varnish package the systemd unit file gets
overwritten and without notice or warning you have a broken varnish with
possible external effect.
Please declare the unitfile as config file so the update process asks what
to do if there are changes to the file or make changing the port in
Thanks a lot