If you have multiple virtual hosts on your webserver, installing Varnish will cause all virtual hosts to be cached. With VCL it’s possible to exclude some virtual hosts.

sudo nano /etc/varnish/default.vcl
sub vcl_recv {     # Don't cache domain1.com or domain2.org - optional www     if (req.http.host ~ "(www\.)?(domain1.com|domain2.org)\.(com|nl|org|dev|local)") {         return (pass);     } } sub vcl_deliver {     # You can optionally set a reponse header so it's easier for you to debug

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