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

Heat authentication

Like each of the other OpenStack services that we have seen up until this point, Heat also leverages Keystone to manage its authentication. Therefore, the successful operation of Heat depends on a working and properly configured Keystone installation.

The Keystone service

If there is a problem with Keystone, it will not take long for you to notice this. If you attempt to run the stack-list command when Keystone is not working, you will see an error similar to the following one:

Note that, in the error message, the connection URL is for the Keystone service. This is a clear sign that something is wrong with the Keystone endpoint or process. In this situation, you want to make sure that Keystone is up and running correctly. If you need to troubleshoot Keystone, refer to Chapter 2, Troubleshooting OpenStack Identity.

Auth credentials

One issue that can be difficult to troubleshoot is incorrect credentials. When you attempt to run heat commands with incorrect credentials, you...