Book Image

Learning OpenStack Networking (Neutron)

By : James Denton
Book Image

Learning OpenStack Networking (Neutron)

By: James Denton

Overview of this book

OpenStack Neutron is an OpenStack component that provides networking as a service for other OpenStack services to architect networks and create virtual machines through its API. This API lets you define network connectivity in order to leverage network capabilities to cloud deployments. Through this practical book, you will build a strong foundational knowledge of Neutron, and will architect and build an OpenStack cloud using advanced networking features. We start with an introduction to OpenStack Neutron and its various components, including virtual switching, routing, FWaaS, VPNaaS, and LBaaS. You’ll also get hands-on by installing OpenStack and Neutron and its components, and use agents and plugins to orchestrate network connectivity and build a virtual switching infrastructure. Moving on, you’ll get to grips with the HA routing capabilities utilizing VRRP and distributed virtual routers in Neutron. You’ll also discover load balancing fundamentals, including the difference between nodes, pools, pool members, and virtual IPs. You’ll discover the purpose of security groups and learn how to apply the security concept to your cloud/tenant/instance. Finally, you' ll configure virtual private networks that will allow you to avoid the use of SNAT and floating IPs when connecting to remote networks.
Table of Contents (21 chapters)
Learning OpenStack Networking (Neutron) Second Edition
About the Author
About the Reviewers

Chapter 9. Distributed Virtual Routers

Prior to the introduction of Neutron in the Folsom release of OpenStack, all network management was built into the Nova API and was known as nova-network. Nova-network remains an alternative to Neutron, although the networking models and functionality provided by it are limited when compared to the advanced features offered by Neutron. Despite its advanced feature set, up until the Juno release, Neutron was unable to replicate one of the most common networking scenarios available with nova-network: FlatDHCP with multi-host.

The multi-host functionality of nova-network offers high availability of networking by limiting the single points of failure to individual compute nodes rather than single network nodes or L2/L3 agents. High availability using distributed virtual routers borrows many concepts from the nova-network multi-host model while retaining support for many of the networking features provided by Neutron.