Virtualhost issue

[Vladimir Dyachenko]

Folks,

I am discovering Varnish which looks like a gift from Gods, or from
Poul-Henning.

We have one case where clients gets big DDoS and we distibute HTTP servers
between various ISP. I have set it up alright for one host, but now I need
to do virtualhost as we have various sites.

Upon restart varnish does not start (no error and nothing in logs).
Wondering what obvious I did wrong.

Here is my configuration:

/// start

# This is a basic vcl.conf file for varnish.
backend default {
        set backend.host = "localhost";
        set backend.port = "80";
}
backend mysite1-com {
         set backend.host = "www.mysite1.com";
         set backend.port = "80";
}
backend mysite2-com {
        set backend.host = "www.mysite2.com";
        set backend.port = "80";
}
acl purge {
                "localhost";
}
sub vcl_recv {
        # Knock knock, who's there ?
 if (req.http.host ~ "^(www|www2|www3\.)?mysite1\.com$") {
                set req.backend = mysite1-com;
        }
 elseif (req.http.host ~ "^(www|www2|www3\.)?mysite2\.com$") {
                set req.backend = mysite2-com;
        }
 else {
                error 404 "Unknown virtual host";
        }
        if (req.request != "GET" && req.request != "HEAD") {
                # PURGE request if zope asks nicely
                if (req.request == "PURGE") {
                        if (!client.ip ~ purge) {
                              error 405 "Not allowed.";
                }
                lookup;
                }
                pipe;
        }
        if (req.http.Expect) {
                pipe;
        }
        if (req.http.Authenticate || req.http.Authorization) {
                pass;
        }
        # We only care about the "__ac.*" cookies, used for authentication
        if (req.http.Cookie && req.http.Cookie ~
"__ac(|_(name|password|persistent))=") {
                pass;
        }
        # File type that we will always cache
        if (req.request == "GET" && req.url ~
"\.(gif|jpg|swf|css|js|png|jpg|jpeg|gif|png|tiff|tif|svg|swf|ico|css|js|vsd|doc|ppt|pps|xls|pdf|mp3|mp4|m4a|ogg|mov|avi|wmv|sxw|zip|gz|bz2|tgz|tar|rar)$")
{
            lookup;
            lookup;
        }
        if (req.request == "POST") {
                pipe;
        }
        # force lookup even when cookies are present
        if (req.request == "GET" && req.http.cookie) {
                lookup;
        }
        if (req.http.Cache-Control ~ "no-cache") {
                pass;
        }
        lookup;
}
sub vcl_fetch {
        # force minimum ttl of 300 seconds
        if (obj.ttl < 3000s) {
                set obj.ttl = 3000s;
        }
}
# Do the PURGE thing
sub vcl_hit {
        if (req.request == "PURGE") {
                set obj.ttl = 0s;
                error 200 "Purged";
        }
}
sub vcl_miss {
        if (req.request == "PURGE") {
                error 404 "Not in cache";
        }
}

/// end

Any help is most welcome.

Regards.

- Vladimir
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