OpenStack has some main components: Interfaces & API, Groups and Users, Networking, Storage, Hosts and Clusters.
- Interfaces & API. The two main interfaces for interaction with OpenNebula are the Command Line Interface (CLI) and the Graphical User Interface (GUI). The Graphical User Interface is also known as “Sunstone”. OpenNebula offers different APIs for Developers to extend the functionality or built on top of OpenNebula. These APIs are currently available as Amazon Web Services (AWS) APIs and OCCI Implementation.
- Groups and Users. OpenNebula allows different groups and users. It is also possible to integrate with different services such as LDAP and Microsoft’s Active Directory. Multi-tenancy is possible by default, which eases billing and accounting. OpenNebula comes with the following standard users: administrators, regular users, public users and service users. Administrators are in charge of administrative tasks within OpenNebula, regular users can use the functionality of OpenNebula in the self-service Portal. Public users are restricted users that may only use a subset of the functionality and service users are users that can use the APIs or Interfaces in OpenNebula.
- Networking. The Networking interface in OpenNebula is fully extensible, which allows almost any integration in existing data centers. There is also support for VLAN and Open vSwitch.
- Storage. OpenNebula supports different storage systems such as the file system storage, distributed network storage or block storage.
- Hosts. OpenNebula supports the following hypervisors: Xen, KVM and VMware on the host. A host has three main components: the host management, the cluster management and the host-monitoring component. The host management is implemented by the “onehost” and allows common operations on hosts such as initial setup or the machine lifecycle management. The cluster management allows placing a host in a specific cluster. This is implemented by the “onecluster” command. Host monitoring is done with the information driver (IM). Monitoring allows administrators to gather information about the health of a host.
- Clusters. Clusters are a pool of hosts that share networking and data stores. A Cluster can be compared to a zone. Clusters are typically fulfilling different needs such as the production/testing differences.
OpenNebula allows the grouping of different Hosts into a virtual data center (VDC) within a cluster. Different Hosts can also be grouped into zones that allow better administration for similar hosts.
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