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Marcus_Hong_Yu's avatar
Marcus_Hong_Yu
Icon for Nimbostratus rankNimbostratus
Jun 02, 2017

LTM irule same irule got called by multiple tmm instances

HI guys, recently I'm working on an irule to make LTM VS acting as reverse proxy. basically the user will call the VS on https, and the VS will use the irule to do DNS query against a specific URL an...
application delivery
iRules
LTM
Marcus_Hong_Yu's avatar
Marcus_Hong_Yu
Icon for Nimbostratus rankNimbostratus
Jun 02, 2017
Here is the irule I composed

when CLIENT_ACCEPTED { set index 0 set dnslist [list 10.1.1.1 10.1.1.12 10.2.2.4] set max 3 while {$index <= $max} { set dns [lindex $dnslist $index]

 

perform DNS resolution

set dest [lindex [RESOLV::lookup @$dns -a ";] 0] Check if the first list element was empty if {$dest eq ""}{ No valid IP resolved against DNS set index [expr {$index + 1}] } else { Set Node IP based on DNS resolution node $dest 443 set index [expr {$max + 1}] } } }