Question

I have several backends set up, each one is detected in the VCL and then the correct set up applied. This works for some of the sites, but a few get pointed to the same site.

I have read this and applied this, it works for some, but not for others.

Configure multiple sites with Varnish

For example I have some backends defined:

backend site4 {
    .host = "127.0.0.1";
    .port = "81";
}

backend site3 {
    .host = "127.0.0.1";
    .port = "81";
}

backend site2 {
    .host = "127.0.0.1";
    .port = "81";
}

backend site1 {
    .host = "127.0.0.1";
    .port = "81";
}

Then in vcl_recv I set the host and the correct backend:

if (req.http.host ~ "(?i)^(www.)?site1.co.uk") 
{
    set req.http.host = "www.site1.co.uk";
    set req.backend = site1;   
} 
elsif (req.http.host ~ "(?i)^(www.)?site2.co.uk") 
{
    set req.http.host = "www.site2.co.uk";
    set req.backend = site2;   
} 
elsif (req.http.host ~ "(?i)^(www.)?site3.com") 
{
    set req.http.host = "www.site3.com";
    set req.backend = site3;
} 
elsif (req.http.host ~ "(?i)^(www.)?site4.net") 
{
    set req.http.host = "www.site4.net";
    set req.backend = site4;
} 

http://www.site1.co.uk works, as does http://www.site2.co.uk, but http://www.site3.com and http://www.site4.net both show the content for http://www.site2.co.uk – it’s like its ignoring my backend and just using the same one for certain sites.

The host is set correctly, because if I do:

curl -I http://site3.com

when using the following in vcl_fetch

set beresp.http.X-Host = req.http.host;  

I can see the host is correctly set as http://www.site3.com

Any ideas anyone?

Side note, is there a shorter method of defining my backends?

Answer 1

For the sites that had not worked I had not added the new Apache port to the VirtualHost entry

I had

<VirtualHost *:80>

It needed to be

<VirtualHost *:80 *:81>

To work on the new Apache port