Steps I've done to setup Varnish:
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Install Varnish (with varnish modules) on Debian9 (using commands from: https://github.com/ezsystems/ezplatform-http-cache/blob/v0.4.0/docs/varnish/varnish.md)
varnish is already the newest version (5.0.0-7+deb9u2).
varnish-modules is already the newest version (0.9.1-4).
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Change Varnish to use 80 port: (I've used a mix of: http://varnish-cache.org/docs/trunk/tutorial/putting_varnish_on_port_80.html and