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Gilles_Archer_3's avatar
Gilles_Archer_3
Icon for Nimbostratus rankNimbostratus
Sep 30, 2013

How to redirect user to URL based on entered CNAME

I apologize if this has been asked and answered in the past, but I'm not sure which keywords I should be using to find what I'm looking for.

 

What I'm trying to do is when a user enters 'service-a' in a browser, we want the GTM to direct the user to "http://service-a.company.com". If they enter 'service-b' in the browser, we want to direct them to "http://service-a.company.com/service-b".

 

Can this be solved with just an iRule on the GTM? Or is this mostly an LTM solution?

 

Thanks everyone.

 

application delivery
availability
design
devops
iRules

1 Reply

  • Kevin_Stewart's avatar
    Kevin_Stewart
    Icon for Employee rankEmployee
    Oct 01, 2013

    Just a thought, but the first issue is generally resolved with a CNAME. I don't believe GTM can natively issue a CNAME from a given short name, so an iRule like this (applied to the LTM listener VIP) could work. This is a very simple example, so I'm sure there's a better way.

    when DNS_REQUEST {
    switch [string tolower [DNS::question name]] {
        "service-a" {
            DNS::answer insert "service-a CNAME service-a.company.com"
            DNS::return
        }
        "service-b" {
            DNS::answer insert "service-b CNAME service-b.company.com"
            DNS::return
        }
    }
}

    Where "service-a.company.com" and "service-b.company.com" resolve to the same virtual server IP. Then use an iRule on the VIP that validates the Host header:

    when HTTP_REQUEST {
    if { [string tolower [HTTP::host]] equals "service-b.company.com" } {
        HTTP::redirect "http://service-a.company.com/service-b"
    }
}