Book Image

Troubleshooting OpenStack

By : Tony Campbell
Book Image

Troubleshooting OpenStack

By: Tony Campbell

Overview of this book

OpenStack is a collection of software projects that work together to provide a cloud fabric. OpenStack is one of the fastest growing open source projects in history that unlocks cloud computing for everyone. With OpenStack, you are able to create public or private clouds on your own hardware. The flexibility and control afforded by OpenStack puts the cloud within reach of anyone willing to learn this technology. Starting with an introduction to OpenStack troubleshooting tools, we’ll walk through each OpenStack service and how you can quickly diagnose, troubleshoot, and correct problems in your OpenStack. Understanding the various projects and how they interact is essential for anyone attempting to troubleshoot an OpenStack cloud. We will start by explaining each of the major components and the dependencies between them, and move on to show you how to identify and utilize an effective set of OpenStack troubleshooting tools and fix common Keystone problems. Next, we will expose you to common errors and problems you may encounter when using the OpenStack Block Storage service (Cinder). We will then examine Heat, the OpenStack Orchestration Service, where you will learn how to trace errors, determine their root cause, and effectively correct the issue. Finally, you will get to know the best practices to architect your OpenStack cloud in order to achieve optimal performance, availability, and reliability.
Table of Contents (17 chapters)
Troubleshooting OpenStack
About the Author
About the Reviewer

Troubleshooting tools

Neutron is incredible, powerful, and extensible. It supports plugins for dozens of backends, but the two most commonly installed backends are Open vSwitch and Linux Bridge. As a result, you can take advantage of many of the common Linux troubleshooting tools when working with Neutron. In this section, we'll cover some of the basic Neutron troubleshooting tools, including ovs-vsctl and iproute2.


This is used to configure and query Open vSwitch. This tool can be very useful when troubleshooting Neutron networks that leverage Open vSwith. For example, to see the contents of the configuration database, we can use the ovs-vsctl show command. Take the following example for instance:

There are a few things worth pointing out in the preceding output. You'll notice that there are two bridges, one named br-int and another named br-tun. On br-int, there are multiple ports. There is one port named tapa4391bff-da. This is the tap interface coming from our instance. You will...