Front-end: Machine running the OpenNebula services.

Host: Physical machine running a supported hypervisor. See the Host subsystem.

Cluster: Pool of hosts that share datastores and virtual networks. Clusters are used for load balancing, high availability, and high performance computing.

Image Repository: Storage for registered Images. Learn more about the Storage subsystem.

Sunstone: OpenNebula web interface. Learn more about Sunstone

OCCI Service: Server that enables the management of OpenNebula with OCCI interface. Learn more about OCCI Service

Self-Service OpenNebula web interfaced towards the end user. It is implemented by configuring a user view of the Sunstone Portal.

EC2 Service: Server that enables the management of OpenNebula with EC2 interface. Learn more about EC2 Service

OCA: OpenNebula Cloud API. It is a set of libraries that ease the communication with the XML-RPC management interface. Learn more about ruby and java APIs.

Template: Virtual Machine definition. These definitions are managed with the onetemplate command.

Image: Virtual Machine disk image, created and managed with the oneimage command.

Virtual Machine: Instantiated Template. A Virtual Machine represents one life-cycle, and several Virtual Machines can be created from a single Template. Check out the VM management guide.

Virtual Network: A group of IP leases that VMs can use to automatically obtain IP addresses. See the Networking subsystem.

VDC: Virtual Data Center, fully-isolated virtual infrastructure environments where a group of users, under the control of the VDC administrator.

Zone: A group of interconnected physical hosts with hypervisors controlled by OpenNebula.

ACL: Access Control List. Check the managing ACL rules guide.

oneadmin: Special administrative account. See the Users and Groups guide.

oZones: The susbsystem in OpenNebula that manages zones.