Book Image

Learning OpenStack Networking - Third Edition

By : James Denton
Book Image

Learning OpenStack Networking - Third Edition

By: James Denton

Overview of this book

OpenStack Networking is a pluggable, scalable, and API-driven system to manage physical and virtual networking resources in an OpenStack-based cloud. Like other core OpenStack components, OpenStack Networking can be used by administrators and users to increase the value and maximize the use of existing datacenter resources. This third edition of Learning OpenStack Networking walks you through the installation of OpenStack and provides you with a foundation that can be used to build a scalable and production-ready OpenStack cloud. In the initial chapters, you will review the physical network requirements and architectures necessary for an OpenStack environment that provide core cloud functionality. Then, you’ll move through the installation of the new release of OpenStack using packages from the Ubuntu repository. An overview of Neutron networking foundational concepts, including networks, subnets, and ports will segue into advanced topics such as security groups, distributed virtual routers, virtual load balancers, and VLAN tagging within instances. By the end of this book, you will have built a network infrastructure for your cloud using OpenStack Neutron.
Table of Contents (16 chapters)

Routing east-west traffic between instances

In the network world, east-west traffic is traditionally defined as server-to-server traffic. In Neutron, as it relates to distributed virtual routers, east-west traffic is traffic between instances in different networks owned by the same project. In Neutron's legacy routing model, traffic between different networks traverses a virtual router located on a centralized network node. With DVR, the same traffic avoids the network node and is routed directly between the compute nodes hosting the virtual machine instances.

Reviewing the topology

Logically speaking, a distributed virtual router is a single router object connecting two or more project networks, as shown in the following...