How to dynamically remove unpingable "A" records and add when host becomes pingable

Does anyone have a script or software they use so that I can automatically update my "A" records when a host is unavailable. i.e. www.mywebserver.com has 2 IP addresses (A records): 1.1.1.1, 2.2.2.2 When 2.2.2.2 becomes unpingable, I would like to remove it's "A" record so it is only 1.1.1.1 When

How to modify "A" records on the slave when master is down?

Hello. I have two geographically different datacenters. Each datacenter has two instances of BIND. There is one master out of these four. The zones will have multiple "A" records (pointing to the two datacenters to provide some minimal amount of redundancy and load balancing) What I want to do