best configuration for varnish and multiple IPs and vhosts?

Chris Hecker checker at
Tue Jun 22 01:55:17 CEST 2010

Hmm, by "one IP", do you mean I should change the DNS entries on the 
sites and have them all pointing at a single IP (in other words, if 
there was no varnish, have them all running as NameVirtualHosts)?

If so, why not just have varnish listen on all the IPs instead of 
pushing it all through one IP?


Caunter, Stefan wrote:
> One varnish on one IP, that knows about all of the apache vhosts. You 
> can run apache on if you like. Varnish must answer externally 
> for these websites.
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> Subject: best configuration for varnish and multiple IPs and vhosts?
> I searched around for an answer to this, but wasn't able to find
> anything comprehensive, so I'll ask here.  I'm a total newbie at this
> stuff, so please let me know if I missed some obvious link.
> I have a single webserver with 5 IP addresses.  Each IP has at least one
> apache-based site on it, and sometimes there are multiple on a single IP
> via NameVirtualHost.  None of the sites share any content.
> What is the best varnish setup for this?  It seems there are multiple
> options:
> 1.  Have a single varnishd listen on all the IPs and run them all
> through a single apache port with name virtual hosts, so it's one big cache?
> 2.  Multiple varnish daemons, one per IP, apache listening on multiple
> ports, one per IP for the back end?
> 3.  Something else entirely?
> I don't have a ton of memory, if that matters.  I need to use a cache
> mostly to handle spikes from being reddited and whatnot, the normal
> daily load is fine for the server.
> Thanks,
> Chris
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