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
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Security groups are fundamental to limiting access to Neutron ports and instances and allow users to create ingress and egress rules that allow traffic from specific addresses, ports, protocols, and even other security groups. It is important to keep in mind that security group rules can only be constructed to allow traffic as all traffic is denied by default in both directions—ingress and egress.

Using the reference plugin, Neutron converts security group rules to iptables rules that are applied on individual compute nodes and filter traffic as it passes through the virtual switches. No modifications are made to the instances themselves and firewalls within the instances can provide additional filtering if required.

In the next chapter, we will begin to look at Neutron routers, starting with the standalone variety. We will examine their involvement in routing traffic between tenant networks and cover the configuration and use of floating IPs to provide external connectivity to instances...