1.2. OVN Architecture
The OVN architecture replaces the OVS ML2 plugin with the OVN Modular Layer 2 (ML2) plugin to support the Networking API. OVN provides robust networking services for the Red Hat OpenStack platform.
The OVN architecture consists of the following components and services:
- OVN ML2 plugin
- Translates the OpenStack-specific networking configuration into the platform-agnostic OVN logical networking configuration. This plugin typically runs on the Controller node.
- OVN Northbound (NB) database (
ovn-nb) -
Stores the logical OVN networking configuration from the OVN ML2 plugin. This database typically runs on the Controller node and listens on TCP port
6641. - OVN Northbound service (
ovn-northd) - Converts the logical networking configuration from the OVN NB database to the logical data path flows and populates these on the OVN Southbound database. This service typically runs on the Controller node.
- OVN Southbound (SB) database (
ovn-sb) -
Stores the converted logical data path flows. This database typically runs on the Controller node and listens on TCP port
6642. - OVN controller (
ovn-controller) -
Connects to the OVN SB database and acts as the open vSwitch controller to control and monitor network traffic. Runs on all Compute and gateway nodes where
OS::Tripleo::Services::OVNControlleris defined. - OVN metadata agent (
ovn-metadata-agent) -
Spawns the
haproxyinstances for managing the OVS interfaces, network namespaces and HAProxy processes used to proxy metadata API requests. Runs on all Compute and gateway nodes whereOS::TripleO::Services::OVNMetadataAgentis defined.
