How do I create a passive health monitor?

Actually, there is a new command in 9.4.x called LB::down. Basically, when it is called, it forces LTM to mark the node down and schedule an immediate health check using the assigned monitor. LB::down does NOT force re-loadbalancing itself - if you want to repeat your request and force another LB decision after calling LB::down, you can issue HTTP::retry.

 

Here is an example:

 

 

when HTTP_REQUEST {

 

set request [HTTP::request]

 

}

 

when HTTP_RESPONSE {

 

if { [HTTP::status] >= 500 } {

 

LB::down

 

HTTP::retry $request

 

}

 

}