Reserved IP Tutorials
A DigitalOcean Reserved IP address is a publicly-accessible static IP address that you can assign to a Droplet and then reassign to another Droplet later, as needed. You can implement a failover mechanism with reserved IPs to build a high availability infrastructure.
Note
The Floating IP service is now called Reserved IPs. The Reserved IP service retains the same functionality as the prior service.
This community tutorial explains how to create a 2-node HA server setup by with Heartbeat and a DigitalOcean Reserved IP. Heartbeat is an open-source program that provides cluster infrastructure capabilities — cluster membership and messaging — to client servers.
digitalocean.com/community
This community tutorial explains how to use Corosync and Pacemaker to create a high availability (HA) infrastructure with DigitalOcean Reserved IPs. Corosync provides a cluster membership and closed communication model for creating replicated state machines, on top of which cluster resource managers like Pacemaker can run. Corosync can be seen as the underlying system that connects the cluster nodes together, while Pacemaker monitors the cluster and takes action in the event of a failure.
digitalocean.com/community