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

Visualizing the traffic flow when using Open vSwitch

When using the Open vSwitch driver, for an Ethernet frame to travel from the virtual machine instance out through the physical server interface, it will potentially pass through nine devices inside the host:

  • The tap interface: tapXXXX

  • The Linux bridge: qbrXXXX

  • The veth pair: qvbXXXX, qvoXXXX

  • The OVS integration bridge: br-int

  • OVS patch ports: int-br-ethX and phy-br-ethX

  • The OVS provider bridge: br-ethX

  • The physical interface: ethX

  • The OVS tunnel bridge: br-tun

The Open vSwitch bridge br-int is known as the integration bridge. The integration bridge is the central virtual switch that most virtual devices are connected to, including instances, DHCP servers, routers, and more. When Neutron security groups are enabled, however, instances are not directly connected to the integration bridge. Instead, instances are connected to individual Linux bridges that are cross connected to the integration bridge using a veth cable.


The reliance on Linux bridges...