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

Virtual network devices

OpenStack is responsible for configuring and managing many different types of virtual and physical network devices and technologies across the cloud infrastructure.

Virtual network interfaces

OpenStack uses the libvirt KVM/QEMU driver to provide platform virtualization in default Nova configurations. When an instance is booted for the first time, Neutron assigns a virtual port to each network interface of the instance. KVM creates a virtual network interface called a tap interface on the compute node hosting the instance. The tap interface corresponds directly to a network interface within the guest instance. Through the use of a bridge, the host can expose the guest instance to a physical network.


In OpenStack, the name of a tap interface associated with an instance corresponds to the Neutron port UUID, or unique identifier, which the instance is plugged into.

Virtual network switches

Neutron supports many types of virtual and physical switches and includes built-in...