Forum Discussion

habib_Khan's avatar
habib_Khan
Icon for Nimbostratus rankNimbostratus
Mar 02, 2016

irule not functioning

I am using below irule for switching connection between pools depending on request. Its not working as needed. Need help.   when HTTP_REQUEST { set low_hostname [string tolower [HTTP::host]] set ...
application delivery
BIG-IP
LTM
Kai_Wilke's avatar
Kai_Wilke
Icon for MVP rankMVP
Mar 02, 2016

Hi Habib,

just noticed, that the ordering of your iRule is little faulty. You have to use the most restrictiv condition before the less restrictive conditions, otherwise then later conditions wouldn't trigger...

when HTTP_REQUEST { 
    set low_hostname [string tolower [HTTP::host]] 
    set low_uri [string tolower [HTTP::uri]] 
    if { ( $low_hostname equals "topsuat" ) and ( $low_uri starts_with "/socket.io" ) } then { 
        pool topsuat-socket-pool 
    } elseif { ( $low_hostname contains "topsstg" ) and ( $low_uri starts_with "/socket.io" ) } then { 
        pool topsstg-socket-pool 
    } elseif { ( $low_hostname equals "topssit" ) and ( $low_uri starts_with "/socket.io" ) } then { 
        pool topssit-socket-pool 
    } elseif { ( $low_hostname equals "topsstrg" ) and ( $low_uri starts_with "/socket.io" ) } then { 
        pool topstrg-socket-pool 
    } elseif { $low_hostname contains "topsfat" } then { 
        pool topsfat-prod-pool 
    } elseif { $low_hostname contains "topsstg" } then { 
        pool topsstg-pool
    } elseif { $low_hostname contains "topssit" } then { 
        pool topssit-http
    } elseif { $low_hostname contains "topstrg" } then { 
        pool topstrg-pool 
}

Note: In addition I would recommend to check the host and pool names. You have "topsuat" (for 

/socket.io
) but "topsfat" (for 
/*
) and also a slightly mixed naming convention for the pool names which may cause additional confusion. Also check your 
contains
and 
equals
. Sometimes you're using one and sometimes the other...

Cheers, Kai