Multiple virtual hosts via Varnish, incorrect backend if served

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;
}

www.site1.co.uk works, as does www.site2.co.uk, but www.site3.com and www.site4.net both show the content for 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 www.site3.com

Any ideas anyone?

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

score 2 · Answer 1 · answered Aug 22 '12 at 19:08

2

Btw, if you have sites on same backend server, then you don't need to define new backend of each one.

answered Aug 22 '12 at 19:08

ghloogh

1,634
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9

Doomsday · Answer 2 · 2012-08-29T11:48:25.247

1

EDIT: My first answer was wrong. I misunderstood the question.

What I suggest you, is to debug and understand why it's different depending the backend :

disable all cache return pass; in vcl_recv after your if statement
run varnishlog when you run the requests

It should help

edited Aug 29 '12 at 11:48

answered Aug 29 '12 at 11:38

Doomsday

2,650
25
33

score 0 · Accepted Answer · answered Aug 22 '12 at 08:07

0

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

answered Aug 22 '12 at 08:07

Jake N

10,535
11
66
112

Multiple virtual hosts via Varnish, incorrect backend if served

3 Answers3