Forum Discussion

Altostratus

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

Daniel_Wolf

MVP

Sep 27, 2023

Hi Jagadeesh, the solution Paulius provided is the same way I'd recommend to solve the problem. iRules and data-groups are the way to go. This solution will perform.

For your question regarding the performace - there is not a straight yes or no answer.
Just as an example - if you use RSA certificates with a key lenght of 4096 this is much heavier on the CPU than using ECC certificates with a key length of 384. While both offer similar level of security.
Also we don't know how much troughtput and how many requests/sec you are expecting. Sizing a BIG-IP requires more than just the knowledge about one iRule.

My gut feeling is - one CPU is only for lab environments. For prod a I recommend a minimum of two.

Daniel_Wolf

MVP

Sep 28, 2023

For the sake of completeness, I wrote a shorter iRule. I find using SET rather unSETteling. 🙂

when RULE_INIT priority 500 {
    # enable (1) / disable (0) logging
    set static::contentswitching_debug 0
}

when HTTP_REQUEST priority 500 {
    if {[catch {pool [class match -value [string tolower [HTTP::path]] starts_with dg_l7_routing]}]} {
        # default pool
        pool pl_default_pool
    }
    if { $static::contentswitching_debug } { log local0. "Using pool: [LB::server pool]" }
}