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

Checking the services

A successful Nova deployment will have multiple Nova services running, and, in addition, there will be multiple supporting services at play as well. A good first step when troubleshooting is to make sure that each of the services has been successfully initiated. We can check the various Nova services by running this command:

ps –aux | grep nova-

Be sure to include a dash (-), as the Nova services are prefixed with nova-. There are a lot of Nova processes, and in the following sections, we will look at each of these processes. The processes that we will explore are as follows:

  • nova-api

  • nova-scheduler

  • nova-conductor

  • nova-compute


The Nova API service is usually run on the controller node. Nova supports an OpenStack API, which is the default, in addition to an AWS EC2 API. A request to port 8774 will be handled by the OpenStack API. A request to port 8773 will be handled by the AWS EC2 API. Nova also supports a metadata service, which will listen on port 8775...