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jwhite18's avatar
jwhite18
Icon for Nimbostratus rankNimbostratus
May 25, 2016

Irule Integration

Hi guys,

I have this irule:

when HTTP_REQUEST {

switch [HTTP::cookie hectorlbhkg] { - - {

    pool [HTTP::cookie hectorlbhkg]
set selected ""
     }
 default {
    set rand [expr { rand() }]

    if { ($rand < .33) and ([active_members www.hector.com_cluster_2a] >= 3) } {
       pool www.hector.com_cluster_2a
       set selected www.hector.com_cluster_2a
    } elseif { ($rand < .66) and ([active_members www.hector.com_cluster_2b] >= 3) } {
       pool www.hector.com_cluster_2b
       set selected www.hector.com_cluster_2b
    }  elseif {([active_members www.hector.com_cluster_2c] >= 3)} {
       pool www.hector.com_cluster_2c
       set selected www.hector.com_cluster_2c
    }
            }

} } when HTTP_RESPONSE { if {$selected ne ""}{ HTTP::cookie insert name hectorlbhkg value $selected path "/" } }

And I have created this one:

when HTTP_REQUEST { if { [string tolower [HTTP::header User-Agent]] contains “msie7” or "msie8" } { pool } }

Is there a way I can integrate in to one without having to create them separately?

Cheers

application delivery
iRules
LTM

1 Reply

  • Stanislas_Piro2's avatar
    Stanislas_Piro2
    Icon for Cumulonimbus rankCumulonimbus
    May 25, 2016

    Hi,

    your "new" irule is not working.

    The condition must be: 

    ([string tolower [HTTP::header User-Agent]] contains "msie7") or ([string tolower [HTTP::header User-Agent]] contains "msie8")

    And you can optimize the irule like that:

    when RULE_INIT {
    array set static::pools {
        0 "www.hector.com_cluster_2a"
        1 "www.hector.com_cluster_2b"
        2 "www.hector.com_cluster_2c"
    }
}

when HTTP_REQUEST {
    if { ([string tolower [HTTP::header User-Agent]] contains "msie7") or ([string tolower [HTTP::header User-Agent]] contains "msie8") } {
        pool www.hector.com_cluster_2k
    } elseif { [info exists static::pools([HTTP::cookie hectorlbhkg])]} {
        pool $static::pools([HTTP::cookie hectorlbhkg])
    } else {
        set PoolID [expr { int(rand()*[array size static::pools])}]
        while { [info exists static::pools($PoolID)] } {
        log local0. $PoolID
            if { ([active_members $static::pools($PoolID)] >= 3) } {
                pool $static::pools($PoolID)
                set selected $static::pools($PoolID)
                break
            } else {incr PoolID}
        }
    }
}

when HTTP_RESPONSE {
  if {[info exists selected]}{
    HTTP::cookie insert name hectorlbhkg value $selected path "/"
  }
}

    The random value is an integer between 0 and the size of the static array. Adding a new entry in the array will apply without any change in the irule.