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

Using keepalived and VRRP to provide redundancy

Keepalived is a software package for Linux that provides load balancing and high-availability to Linux-based software and infrastructures.

The Virtual Router Redundancy Protocol, or VRRP, is a first-hop redundancy protocol that aims to provide high availability of a network's default gateway by allowing two or more routers to provide backup for this address. If the active router fails, a backup router takes over the address within a brief period of time. VRRP is an open standard and is based on the proprietary protocol known as Hot Standby Router Protocol (HSRP) developed by Cisco.

Neutron uses keepalived, which utilizes VRRP, to provide failover between multiple sets of router namespaces.

VRRP groups

With VRRP, a group of routers can be configured to act as a single virtual router. Routers in the VRRP group elect a master to act as the gateway device, and hosts in the network only need to configure the virtual router to act as their default network...