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

Ceilometer authentication

Like most of the other OpenStack services that we've seen up until this point, Ceilometer relies on Keystone for authentication. Therefore, you want to pay attention to the Ceilometer logs as well as the Keystone logs. If you encounter auth problems with Ceilometer, start by taking a look at the ceilometer-api.log file.

It will be helpful to use grep on this log file, to search for ERROR or WARNING indicators. You may also want to use grep for 404 or 401 responses. If you find authentication errors in the API log, you will most likely find corresponding log lines in the Keystone log file.

When troubleshooting authentication errors, make sure that the authentication credentials in the [keystone_authtoken] stanza of the ceilometer.conf file match the actual values loaded into Keystone for the Ceilometer user. You can test your Ceilometer credentials using the Keystone API.