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

Decomposing a highly available router

Using the concepts demonstrated in previous chapters, let's walk through the creation and decomposition of a highly available router. In the following example, I've started out with an external provider network and tenant network named GATEWAY_NET and TENANT_NET, respectively:

Figure 8.5

Using the router-create command with the --ha=true option, an HA router named MyRouter-HA will be created:

Figure 8.6

Upon the creation of the HA router, a network namespace will be created on at least two hosts running the Neutron L3 agent. In this demonstration, the L3 agent is running on the controller and both compute nodes. Neutron has been configured to create a network namespace on up to three L3 agents.

In the following screenshot, a router namespace that corresponds to the MyRouter-HA router can be observed on each host:

Figure 8.7

Neutron automatically creates a network reserved for communication between the routers upon the creation of the first HA router within...