We discussed virtual IP addresses earlier; now, it's time to leverage them in a more automated fashion. A virtual IP is not a service in the traditional sense, but it does provide functionality that we need in a high-availability configuration. In cases where we also have control over DNS resolution, we can even assign a name to the virtual IP address to insulate applications from future changes.
For now, this recipe will limit itself to outlining the steps required to add a transitory IP address to Pacemaker.
