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

Common problems

In this section, we will examine some of the common networking problems that you might face in an OpenStack cluster. We will provide steps to troubleshoot issues, and we will offer potential solutions to resolve the issue. It's worth repeating that there are multiple ways to configure Neutron, so the steps you take to solve the following issues may be slightly different depending on your installation. However, these steps should be useful to point you in the right direction.

When you can't ping an instance

If you have an active instance that you can't ping, there are a few things you want to check out. Working your way through the following steps should help you identify and correct the problem.

Security groups

Neutron uses security groups to control the access to instances. The access is controlled through IP filtering. Security groups are similar to ip tables rules of the instance. You can view a list of security groups by running this:

neutron security-group-list

On running...