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

Chapter 3. Troubleshooting the OpenStack Image Service

Glance is the code name for the OpenStack image service. This service is responsible for the functionality that allows users to discover virtual machine images, register new images, and retrieve existing images. Glance provides a RESTful API, which also powers the command-line interface and the image functionality in the Horizon Dashboard.

In this chapter, we will systematically walk you through the troubleshooting layers, which are as follows:

  • Glance services

  • The Glance database

  • The Glance authentication

  • The Glance API

  • The Glance command-line client

  • Glance logging and configuration

  • Common errors

Glance is made up of several components. There is an API service and a registry service included in Glance. Each of these services need to be running for Glance to work properly. Glance also requires a database such as MySQL or Postgres. Finally, Glance supports several storage backends, where images are physically stored. The backend you use is configurable...