Forum Discussion

AllanUK_202329's avatar
AllanUK_202329
Icon for Nimbostratus rankNimbostratus
Jan 12, 2017

iRule for subdomain datagroup matching

Hi, I have been trying to find a solution to my requirement below, We have subdomains like subdomain.domain.com and we want to perform a match on the domain part in a data group to return a pool ...
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devops
iRules
Kai_Wilke's avatar
Kai_Wilke
Icon for MVP rankMVP
Jan 12, 2017

Hi Allan,

which TMOS version are you running on? I'm asking because the 

[findclass]
command and the way you're referencing the data-group (aka. via 
$::datagroup
) is deprecated since may years and would harm CMP-operations on current TMOS versions.

If you've loaded a TMOS version v10 or higher on your box, then the take a look to the iRule below. It uses the CMP-friendly 

[class]
syntax to lookup the data-group containing the domain-to-pool information.

ltm data-group internal DG-HTTPSPool {
    records {
        "domain.com" { 
            data "pool-domain.com" 
        }
        "domain.net" { 
            data "pool-domain.net" 
        }
    }
    type string
}
when HTTP_REQUEST {
    if { [set pool [class match -value [domain [string tolower [getfield [HTTP::host] ":" 1]] 2] equals "DG-HTTPSPool"]] ne "" } then {
        pool $pool
    } else {
        HTTP::respond 403 content "Access denied - Invalid HOST-name requested" "Content-Type" "text/html"
    }
}

Cheers, Kai