In a three-node OpenStack architecture, the Ceilometer Agent and the Nova Hypervisor services are part of the compute node. OpenStack is an opensource cloud computing platform. Each OpenStack modular component is responsible for a particular function, and each component has a code name. The following list contains several of the most popular OpenStack components:
- Nova -OpenStack Compute: manages pools of computer resources
- Neutron -OpenStack Networking: manages networking and addressing
- Cinder -OpenStack Block Storage: manages blocklevel storage devices
- Glance -OpenStack Image: manages disk and server images
- Swift -OpenStack Object Storage: manages redundant storage systems
- Keystone -OpenStack Identity: is responsible for authentication
- Horizon -OpenStack Dashboard: provides a graphical user interface (GUI)
- Ceilometer -OpenStackTelemetry: provides counter based tracking that can be used for customer usage billing

A three-node OpenStack architecture consists of the compute node, the controller node, and the network node. The compute node consists of the following services:
- Nova Hypervisor
- Kernelbased Virtual Machine (KVM) or Quick Emulator (QEMU)
- Neutron Modular Layer 2 (ML2) PlugIn
- Neutron Layer 2 Agent
- Ceilometer Agent

The controller node consists of the following services:
- Keystone
- Glance
- Nova Management
- Neutron Server
- Neutron ML2 PlugIn
- Horizon
- Cinder
- Swift
- Ceilometer Core

The network node consists of several Neutron services:
- Neutron ML2 PlugIn
- Neutron Layer 2 Agent
- Neutron Layer 3 Agent
- Neutron Dynamic Host Configuration Protocol (DHCP) Agent