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

Supporting services

As you know, Nova works in concert with other OpenStack services, including Keystone, Glance, Neutron, and others. As a result, it is possible that problems with these services may manifest themselves as problems with Nova.

The Nova database

Nova makes use of a database to support its functionalities. If this database is not running or is improperly configured, it can cause your Nova installation to be unusable. To troubleshoot the Nova database, begin by making sure that the database engine is running. For example, when using MySQL, you can check the status by running the following command:

service mysql status

If the database is running, it will be indicated in the output of this command:

mysql start/running, process 15628

After confirming that the database engine is running, you should try to connect to the database server using the same parameters that are set up in the Nova configuration file. You can look up the connection information by running the following command...