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

Common errors

In this section, we will explore a few of the more common errors we may come across in the Glance log files. The different errors you may come across are varied, and part of the troubleshooter's job is tracking down the root cause of those errors.

Unable to establish connection

When using the OpenStack client to execute Glance-related commands, you can come across a connection error similar to the following one:

This typically indicates a configuration problem wherein Keystone is not accessible at the provided URI. When using the Glance client, this value is typically pulled from the OS_AUTH_URL value in the openrc file. Refer to Chapter 2, Troubleshooting OpenStack Identity, for information about the openrc file. You can find yourself in this situation when the value of your os_auth_url is incorrect. Alternately, this could also be the result of Keystone not running on the expected URI and port. To correct this issue, you will need to update your openrc file with the correct...