OpenNebula components:

• 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. Based on the OCCI interface. Learn more about Self-Service
• 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.

OpenNebula resources:

• 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.

OpenNebula management:

• 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.