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

Demonstrating traffic flow through a firewall

To see how firewall policies are applied to a Neutron router, take note of the following firewall rule, which allows HTTP traffic from any source to any destination on TCP port 80:

Figure 11.10

The firewall rule was applied to the policy named MyFirewallPolicy as shown in the following screenshot:

Figure 11.11

As the final step, the policy is associated with a firewall, MyFirewall, as shown in the following screenshot:

Figure 11.12

Examining the chains

Once a firewall is created, the rules within the firewall policy are implemented on the associated router. Running iptables -L -t filter or iptables-save within a router namespace reveals the iptables rules that are implemented by the L3 agent. For readability, only the filter table is shown in the following screenshot:

Figure 11.13

As with security groups, the FORWARD chain is used as the traffic is forwarded through the namespace rather than directed at it:

-A FORWARD -j neutron-filter-top