In addition to nodes, a MAAS cluster controller can manage devices. Devices represent non-installable machines. This feature can be used to track routers, virtual machines, etc. within MAAS.
Same as nodes, devices can be assigned IP addresses and DNS names. IP addresses can be fixed, in which case the device should be configured to use the defined IP address, or dynamic, in which case the device can obtain an IP address from the MAAS DHCP server and will receive the configured IP address.
Devices can also be assigned a parent node and will be automatically deleted (along with all the IP address reservations associated with it) when the parent node is deleted or released. This is designed to model and manage the virtual machines or containers running on a MAAS-deployed node.