maas-rack-controller 2.1.4+bzr5591-0ubuntu1~16.04.1 (amd64 binary) in ubuntu xenial

 The MAAS rack controller (maas-rackd) provides highly available, fast
 and local broadcast services to the machines provisioned by MAAS. You
 need a MAAS rack controller attached to each fabric (which is a set of
 trunked switches). You can attach multiple rack controllers to these
 physical networks for high availability, with secondary rack controllers
 automatically stepping to provide these services if the primary rack
 controller fails.
 .
 A common configuration is to have a rack controller in each rack, with
 a fast primary network interface to the rack switch and secondary
 network interfaces on one or two other nearby racks for high
 availability redundancy.
 .
 This package depends on the necessary components to provide iSCSI,
 DHCP, TFTP and power management.