Varnish for multiple magento sites

[Riccardo Brunetti]

Hello.

I'm new to varnish and I have a question concerning how to manage multiple sites using the same varnish cache frontend.



More specifically, I need to setup a single varnish cache server for two different Magento2 sites.



Looking around I found that it is possible to manage different backends using something like:



> if (req.http.host == "somesite") {
> 
>         set req.backend_hint = somebackend;
> 
>     }

Now, I have two different Magento2 sites and, using the above expression, I can handle the two different backends.

The problem is that I can't understand how to handle the PURGE/BAN of the two independently.



As far as I understand from the .vcl file that Magento2 itself produces there is nothing inside the "purge" section that specifies which resources must be purged.

It seems to me that is site A performs a purge, than also the cache of site B resources will be cleaned.



Can you help me with this or point me to some example or tutorials?



Thanks a lot

Riccardo 
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