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saravana_kumar's avatar
saravana_kumar
Icon for Nimbostratus rankNimbostratus
Sep 04, 2020

Virtual server connection limite through iRule

 

Need iRule help connection limite and redirection

 

Requirement : we have two set of pool A & B, pool A having 8 nodes, Pool B having 3 node

 

We have to limit the connection 3000 on pool A and renaming new connection flow to pool B

 

If the active connection is less than 3000 new connection flow to pool A

application delivery
BIG-IP
iRules
  • Andrew-F5's avatar
    Andrew-F5
    Icon for Employee rankEmployee
    Sep 30, 2020

    You can probably reference this other DevCentral post to get most of the way to your goal, https://devcentral.f5.com/s/question/0D51T00006i7TIA/connection-limit-on-virtual-server

    The iRule below is an example I created but has not been tested for functionality or requirements.

    when RULE_INIT {
	set ::active_connections 0
	set ::max_connections 3000
}
when CLIENT_ACCEPTED {
	#Check if we're over the maximum allowed connections
	if {$::active_connections > $::max_connections } {
		# We're over the max, send to pool B
		pool B
	} else {
		# We're not over the max, so send to Pool A and increment active_connections
		incr ::active_connections 1
		pool A
	}
}
when CLIENT_CLOSED {
	# A connection was closed, so decrement the global counter
	incr ::active_connections -1
}