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

Security groups in OpenStack

A security group is a collection of network access rules, known as security group rules, which limits the types of traffic an instance can send or receive. In the reference architecture, security group rules are converted to iptables rules that are applied on the compute nodes hosting the instances. Each tenant is provided with a default security group that can be modified by users within the tenant. Neutron provides an API to create, modify, apply, and delete security group rules.

There are multiple ways to apply security groups to instances. For example, one or more instances, usually of similar functionality or role, can be placed in a security group. Security group rules can reference IPv4 and IPv6 hosts and networks as well as security groups themselves. Referencing a particular security group in a rule, rather than a particular host or network, frees the user from having to specify individual addresses. Neutron constructs the filtering rules applied on the...