Using App server as monitor for Web Server

Hello iRulers,

 

 

We have a web pool with two members. Having a requirement to put a web node down in pool when corresponding app server goes down (put web1 down when app1 goes down and vice versa) and to to implement the logic, I am thinking of the following iRule,

 

 

Rule1

 

 

if { [active_members pool-having-only-one-app-server-node1] == 0 } {

 

use node ip-of-the-other-web-server2

 

}

 

}

 

 

Rule2

 

 

if { [active_members pool-having-only-one-app-server-node2] == 0 } {

 

use node ip-of-the-other-web-server1

 

}

 

}

 

 

These rules would instruct the VS to use the other node (web2 if app1 is down)

 

 

Is there a simple logic anyone can think of to implement this?

 

 

Is there a posibility to use health of "app node" as a health monitor for web node?

 

 

Thanks.