Multisites and Varnish setup

Hello everyone.

I have a WordPress multisite with around 100 sites, many of which use their own domains mapped using Donncha’s plugin. Users map an A record in their DNS manager to our dedicated IP.

I want to install Varnish and I have this running on a similar setup but it only has 2 sub sites with their own domain:

ports.conf

# NameVirtualHost 127.0.0.1:8080
Listen 127.0.0.1:8080
Listen 127.0.0.1:8000

/etc/apache2/sites-enabled/zz-mass-hosting

NameVirtualHost 127.0.0.1:8080
<VirtualHost 127.0.0.1:8080>

/etc/apache2/sites-enabled/zz-mass-hosting.212.110.XXX.XXX ** is the multisite_ip

NameVirtualHost 127.0.0.1:8000
<VirtualHost 127.0.0.1:8000>
ServerName mysite.co.uk:8000

/etc/default/varnish points

DAEMON_OPTS points to the 2 ips on port 80

I have set up the vcl with 2 backends:

backend default {
.host = “127.0.0.1”;
.port = “8080”;
}

# For 2nd IP Address setting Apache Backend to 127.0.0.1:8000

backend mysite {
.host = “127.0.0.1”;
.port = “8000”;
}

On my test installation I only have 2 sites mapped to their own domains, so I have this:

# choose a backend depending on domain
if (req.http.host ~ “myothersite.co.uk”) {
set req.backend = mysite;
}
if (req.http.host ~ “andanotherone.com”) {
set req.backend = mysite;
}else{
set req.backend = default;
}

Seems to be working OK right now.

But on the new installation I have a heck of a lot of sites to map, so my question is whether there’s a snappy way around this without lots of typing or manual intervention each time a new site is mapped to its own domain (I don’t always know this)?

Alternatives on a postcard.

Thanks in anticipation …