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AceDawg1's avatar
AceDawg1
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Aug 30, 2019

iRule Diverting Traffic to Wrong Pool

Good day all,

 

Was given an iRule to debug and was hoping the DevCentral community might have some pointers. In a nutshell, the iRule is supposed to send traffic to a specific pool if certain criteria are met. If said criteria is not met, then the default assigned to the virtual server should receive the traffic. My understanding of iRules is that if the criteria in the iRule are not met, the F5 will process traffic as if the iRule never existed. In this case, the default pool has to be explicitly declared in the iRule for things to work as expected (code below):

application delivery
BIG-IP
iRules
  • AceDawg1's avatar
    AceDawg1
    Icon for Nimbostratus rankNimbostratus
    Aug 30, 2019
    ltm rule /Common/traffic_mod {
 
when HTTP_REQUEST {
 
#Set URI
set path [string tolower [HTTP::path]]
 
    #If IP and header present then this is return flow which needs to go to Origin
    if {([IP::addr [IP::client_addr] equals w.x.y.z] ||
        [IP::addr [IP::client_addr] equals a.b.c.d] ||
        [IP::addr [IP::client_addr] equals e.f.g.h]) && [HTTP::header exists "SOME-HEADER"]} {
        return
    } else {
        # Add the client-ip into the X-Forwarded-For if it doesn't come from addresses listed
        HTTP::header insert "X-Forwarded-For" [IP::client_addr]
    }
 
    if {$path contains "/somefile.js"} {
        # Test if the pool has active members before sending traffic
        if {[active_members SomePool_443_pl] > 0} {
            pool SomePool_443_pl
            return
            #if the pool is not available, then no need to forward this traffic, just send back an empty 200 OK
        } else {
            HTTP::respond 200
        }
    }
 
    if {[HTTP::method] equals "POST" and ($path contains "/api/customer/login" || $path contains "/api/customer/register")} {
        # Test if the pool has active members before sending traffic
        if {[active_members SomePool_443_pl] > 0} {
            pool SomePool_443_pl
            return
        #if the pool is not available, send traffic to the default pool
        }
    } 
}
}