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Application programming interface.

Block Storage

The OpenStack core project that enables management of volumes, volume snapshots, and volume types. The project name of Block Storage is cinder.


The OpenStack core project that provides compute services. The project name of Compute service is nova.

Database Service

An integrated project that provide scalable and reliable Cloud Database-as-a-Service functionality for both relational and non-relational database engines. The project name of Database Service is trove.

distributed virtual router (DVR)

Mechanism for highly-available multi-host routing when using OpenStack Networking (neutron).


Used to restrict communications between hosts and/or nodes, implemented in Compute using iptables, arptables, ip6tables, and etables.


Infrastructure-as-a-Service. IaaS is a provisioning model in which an organization outsources physical components of a data center, such as storage, hardware, servers, and networking components. A service provider owns the equipment and is responsible for housing, operating and maintaining it. The client typically pays on a per-use basis. IaaS is a model for providing cloud services.

Identity Service

The OpenStack core project that provides a central directory of users mapped to the OpenStack services they can access. It also registers endpoints for OpenStack services. It acts as a common authentication system. The project name of the Identity Service is keystone.

Image Service

An OpenStack core project that provides discovery, registration, and delivery services for disk and server images. The project name of the Image Service is glance.


A virtual network that provides connectivity between entities. For example, a collection of virtual ports that share network connectivity. In Networking terminology, a network is always a layer-2 network.


A core OpenStack project that provides a network connectivity abstraction layer to OpenStack Compute. The project name of Networking is neutron.

Object Storage

The OpenStack core project that provides eventually consistent and redundant storage and retrieval of fixed digital content. The project name of OpenStack Object Storage is swift.


An integrated project that orchestrates multiple cloud applications for OpenStack. The project name of Orchestration is heat.


A kind of web service API that uses REST, or Representational State Transfer. REST is the style of architecture for hypermedia systems that is used for the World Wide Web.


A physical or virtual network device that passes network traffic between different networks.


Logical subdivision of an IP network.


An integrated project that provides metering and measuring facilities for OpenStack. The project name of Telemetry is ceilometer.

virtual private network (VPN)

Provided by Compute in the form of cloudpipes, specialized instances that are used to create VPNs on a per-project basis.

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