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

Swift processes

Swift spawns several processes. When troubleshooting, you will want to confirm that each process is running without any issue. In particular, you want to confirm that the main processes are active and running as expected. The following are the names of the main processes:

  • The proxy server

  • The account server

  • The container server

  • The object server

The proxy server

The Swift proxy server acts as a gateway to the service. The proxy server is where the Swift API listens for requests. There are several errors that may point to the fact that the Swift proxy server isn't running. The swift list command will list the containers under an account. In the following example, instead of returning a list of containers, this command returned an error:

The preceding connection error is an example of what you might see when attempting to use the Swift command-line tool when the proxy server is not running. If you attempt to use the Swift API when the proxy server is in this state, you are likely...