Website migration using Varnish?

[Tobias Eichelbrönner]

Hi,

> My plan is to use varnish in order to fetch Tomcat (or Apache->Tomcat)
> pages from the new application and deliver all urls not found on the new
> application from the old php application.

my first idea would to build a custom error page and redirect all failed
requests from the Java-Website to the old php website.
This is easier if you can use different (sub)domains for the old and the
new page.

The error vcl-code would look something like this (untested)

sub vcl_error {
   if(obj.http.host == "my_java_backend.tld
    set obj.http.Content-Type = "text/html; charset=utf-8";
    set obj.http.Location = "http://my_php_backend.tld/" + req.url;
    set obj.status = 301;#moved permanently
    return(deliver);
  }
}

Sincerely,

Tobias

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