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Manu_Nair's avatar
Manu_Nair
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Feb 22, 2022
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iRule to Forward Traffic Based on URL Name

Hi,

I am in a situation where we have shortage of IP address and am looking for an alternative way to forward traffic to pools based on URL. I am not really good with iRule hence looking for assistance and I have seen posts based on URI, but i am looking for assistance with URL. 

Eg: 1 VIP and based on the url name, the traffic needs to be forwarded to Pool. 

Help on this is appreciated

application delivery
forward traffic
irule
pool
url
  • neeeewbie's avatar
    neeeewbie
    Feb 23, 2022

    Hi 

    below irule will help

    https://support.f5.com/csp/article/K27803480

    when HTTP_REQUEST {
      if { ([string tolower [HTTP::host]] eq "host1") {
            pool pool1
        } elseif { ([string tolower [HTTP::host]] eq "host2")  {
            pool pool2
        }
    }

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    • Manu_Nair's avatar
      Manu_Nair
      Icon for Cirrus rankCirrus
      Feb 22, 2022

      Thanks for the reply, but what the guide shows there is to forward traffic based on the URI (or path). I am looking specifically for different hostnames(URL names) which i am not sure what they call in the irule, http host or header???  so i am not clear how to achive this. 

      Need to extract the URL name through irule and based on the name, forward it to the pools. 

  • Sebastiansierra's avatar
    Sebastiansierra
    Icon for MVP rankMVP
    Feb 22, 2022

    You can use LTM Policies that are in the document that I shared with you before, which is the best way to make this type of deployment without irules.

     

    • Mayur_Sutare's avatar
      Mayur_Sutare
      Icon for MVP rankMVP
      Feb 23, 2022

      Hi Manu_Nair ,

      Modified LTM policy as per your use case. You can have such multiple rules to match based on the URL under a LTM policy.

      iRule given by neeeewbie is also perfect for your use case. One more thing that I want to highlight here is that if you have different domains which will hit on single virtual server with secured port, you would need to handle SSL certiifcates appropriately so for each URL/Site, client will get desired certificate. For this, you need to configure F5 vServer to serve multiple HTTPS sites using the TLS SNI feature. 

      Ref. article - https://support.f5.com/csp/article/K13452 

       

      Hope it helps!

      • Manu_Nair's avatar
        Manu_Nair
        Icon for Cirrus rankCirrus
        Feb 23, 2022

        Hi Mayur, 

        Thanks for the reply!!  I got the certs and other stuff ready. Just was struggling to get this done cos i am not sure what parameter to pass ( eg : HTTP Host ). i will try this with policy and see. 

  • Seçkin's avatar
    Seçkin
    Icon for Cirrus rankCirrus
    Feb 23, 2022

    Hello,

    For this purpose, i would go for LTM Policy over irule. Its very easy to implement and also you dont need to know programming language to do it.

    Regards

    Seçkin

    • Manu_Nair's avatar
      Manu_Nair
      Icon for Cirrus rankCirrus
      Feb 23, 2022

      Thanks for the reply Seckin, I am new this Policy type as well, But i did not what parameter to keep, but looks i got few suggestions to use Policy. I will try it out.