1. What is the nature and description of the request?  

We'd like to see support for the Keepalived notify script script feature in the IP failover pod (See https://github.com/openshift/origin/tree/master/images/ipfailover/keepalived). For a description of this feature, see this blog post which describes it's use: https://tobrunet.ch/2013/07/keepalived-check-and-notify-scripts/

      
2. Why does the customer need this? (List the business requirements here)  

The use case for this feature would be to notify a cloud service for a floating IP change. Many clouds don't support VRRP for floating IPs, but have an API available which could be used by the notify script of Keepalived.
      
3. How would the customer like to achieve this? (List the functional requirements here)


To pass the script into the Pod it could be done over an environment variable (f.e. OPENSHIFT_HA_NOTIFY_SCRIPT) and then write it to a file in the Pod (just like the Keepalived configuration is done).

      
4. For each functional requirement listed, specify how Red Hat and the customer can test to confirm the requirement is successfully implemented.  

Yes