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Jagadeesh's avatar
Jagadeesh
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Sep 27, 2023

what is the Pool limit to do URI redirection using irule

I have a VCMP guest LTM virtual box with 1 Core running on BIG-IP 15.1.9.1 Build 0.0.5 Point Release 1 I have a requirement , With Single VIP listening on Port 443 and selecting the pool using iRule...
application delivery
Jagadeesh's avatar
Jagadeesh
Icon for Altostratus rankAltostratus

Hi ,

May i know if i can create a VIP with out default pool and do redirection based on uri to specific pool using LTM Policies and datagroups ? and May i know what happens when the condition fails ? Is there a a way we can return a generic error or response if the condition fails?

Thanks and Regards ,

Jagadeesh

Paulius's avatar
Paulius
Icon for MVP rankMVP
Oct 05, 2023

Jagadeesh You absolutely can and it would be the following.

when HTTP_REQUEST priority 500 {

    set URI [string tolower [HTTP::uri]]

    if { [class match -- ${URI} eq CLASS-URI-TO-POOL] } {

        set TEMP_POOL [class match -- -value $URI eq CLASS-URI-TO-POOL]

        pool ${TEMP_URI}

    } else {
        HTTP::respond 400 content "Bad Request page" "Content-Type" "text/html" 
            return
    }

}
  • Jagadeesh's avatar
    Jagadeesh
    Icon for Altostratus rankAltostratus
    Oct 05, 2023

    So May i know if have to use both irule and Policies in this case ?

    • Paulius's avatar
      Paulius
      Icon for MVP rankMVP
      Oct 05, 2023

      Jagadeesh I'm not familiar with the traffic policy but I would imagine it would be similar and have a catchall with a specific response that you would like to provide if you do not find a match.

    • Daniel_Wolf's avatar
      Daniel_Wolf
      Icon for MVP rankMVP
      Oct 05, 2023

      It's an either iRule or Local Traffic Policy decission. Last time I tried something like this with LTP, they could read from a datagroup but not use the return value.
      In other words, you would have to build and maintain a VERY LARGE Local Traffic Policy. With iRules it's just a datagroup, that you can easily maintain from the REST API.