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

Know your version

As of the Liberty release of OpenStack, the identity service finds itself in transition. The service supports two API versions: v2 and v3. The v2 version of the API is deprecated, but may still be found in many OpenStack deployments. Recent releases of OpenStack are configured to serve both the v2 and v3 versions of the Identity API. This can be confirmed by examining the keystone-paste.ini configuration file.

In this file, you will find configurations for two composite apps: main and admin. As demonstrated in the preceding example, each app has a setting for /v2.0 and /v3. With this configuration, this deployment will serve a request to the v2 or v3 Identity API. Here, the command-line clients transition from individual clients per project to a unified OpenStack client that works across projects. The keystone command-line client supports v2 of the Identity API. The newer and preferred OpenStack client supports v2 and v3 of the Identity API.

The two composite apps in the...