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Forum Discussion

Yugandhar's avatar
Yugandhar
Icon for Nimbostratus rankNimbostratus
Jun 15, 2018

Pool Selection and Persistence using iRule

Hi,

Can we forward traffic to a particular pool based on the host(domain) section of the URL and apply persistence of 500ms using the below iRule.

when HTTP_REQUEST {

                if { [string tolower [HTTP::host]] equals "ad.test.xya.com" } {

                   pool xya_Test--pool

            } elseif { [string tolower [HTTP::host]] equals "bc.test.xya.com" } {

                   pool xya_Test--pool 

        } elseif { [string tolower [HTTP::host]] equals "vf.test.xya.com" } {

                   pool xya_Test--pool

                   persist 500

        } elseif { [string tolower [HTTP::host]] equals "lg.test.xya.com" } {

                   set clientip [IP::remote_addr]

                   pool xya_Test--pool

                   persist uie $clienip 500

        }else {            

           pool Default_VIP--pool 

        }

}

Thanks,

Yugandhar.

application delivery
BIG-IP
iRules

1 Reply

  • Niels_van_Sluis's avatar
    Niels_van_Sluis
    Icon for MVP rankMVP
    Jun 17, 2018

    Yes it's possible to forward traffic to a specific pool based on the HTTP host header. As far as I know it's not possible to persist with a timeout specified in milliseconds. The timeout for persistence should be in seconds. For an iRule like this, it's better to use the switch function. See example below.

    when HTTP_REQUEST {
    switch [string tolower [HTTP::host]] {
        "ad.test.xya.com" {
            pool xya_Test--pool
        }
        "bc.test.xya.com" {
            pool xya_Test--pool
        }
        "vf.test.xya.com" {
            pool xya_Test--pool
        }
        "lg.test.xya.com" {
            pool xya_Test--pool
            persist source_addr
        }
        default {
            pool Default_VIP--pool
        }
    }
}