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

Glance services

When troubleshooting Glance, one of the first things to check is whether or not the service is running. A quick way to confirm this is by running some simple Glance commands from the command line:

glance image-list

When Glance operates properly, this command should return a list of images in your Glance repository, similar to the following output:

This command may also return an empty list if your Glance repository is empty. You may receive an error when you run this command that is similar to the following error:

This error typically occurs when you haven't passed all the necessary attributes to the glance image-list command. The common way to solve this problem is by creating an openrc file that contains the attributes that are required by the command-line client. A sample openrc file would look like this:

Once you adjust the preceding lines to include your specific details, you would save that content to a file named openrc. To leverage these settings, simply source the openrc...