The service point is essentially a Unix-based operating system that runs a collection of containers. However, it doesn't provide a console to end users. The IP configuration, specifically the configuration of the VIP on the service point’s loopback interface, is done through the GuestInfo facility that VMWare provides.
This is the VIP of the load balancer, also known as the service address:
This is the name of the interface, in this case, the loopback:
Additional information is available on the CoreOS GuestInfo page.
For more information