How can the F5 inform a node it is about to become the primary active node?
I have a collection of nodes living behind an F5 BIG-IP Link Controller. One subset of these nodes needs to be configured such that all incoming requests (probably on a certain port) are directed to a single active node. The other nodes in this subset are idle until needed for failover. If the F5 finds that the 'primary' node is dead/unresponsive, then it should choose another node from this group and make it active and direct all new incoming traffic to it.
This seems pretty basic, but what I haven't been able to figure out is that I want to 'notify' the node if it is about to become the primary/active node. These nodes will have processes that should only be running on the single active node. So if a node is about to become the single active node, can the F5 call a predetermined URL on the node which will inform it to start up these processes and prepare for incoming traffic?
I don't know if this is best solved with iRules, or iControl, or ?
Thanks! Mike