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Troubleshooting OpenStack
Troubleshooting OpenStack

Troubleshooting OpenStack: Get unstuck and start stacking!

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Troubleshooting OpenStack

Chapter 2. Troubleshooting OpenStack Identity

Keystone plays a crucial role in the OpenStack deployment. This project is responsible for providing services that support an identity, token management, a service catalog, and policy functionality. While Keystone does not depend on any other OpenStack services, most other OpenStack services depend on Keystone. This core dependency on Keystone means that problems with your Keystone services can cascade, causing problems for many of the other OpenStack services. Tracking down a problem in OpenStack can be complicated due to the different projects that operate together to provide a functionality. When troubleshooting OpenStack, it's smart to make sure that Keystone is operating as intended. In this chapter, we will explore the following topics:

  • Identifying different versions of the Keystone API and how to avoid configuration problems
  • Troubleshooting the command-line interface clients
  • Checking the Identity API
  • Fixing issues with the...

Know your version

As of the Liberty release of OpenStack, the identity service finds itself in transition. The service supports two API versions: v2 and v3. The v2 version of the API is deprecated, but may still be found in many OpenStack deployments. Recent releases of OpenStack are configured to serve both the v2 and v3 versions of the Identity API. This can be confirmed by examining the keystone-paste.ini configuration file.

Know your version

In this file, you will find configurations for two composite apps: main and admin. As demonstrated in the preceding example, each app has a setting for /v2.0 and /v3. With this configuration, this deployment will serve a request to the v2 or v3 Identity API. Here, the command-line clients transition from individual clients per project to a unified OpenStack client that works across projects. The keystone command-line client supports v2 of the Identity API. The newer and preferred OpenStack client supports v2 and v3 of the Identity API.

The two composite apps in the...

Running Keystone under Eventlet

If you are running Keystone using the Eventlet-based process, you will use the keystone-all command to start the Keystone services. This command will start both the Service API and the Administration API in a single process.

Checking the Keystone service

You can confirm that Keystone was started successfully by running ps -aux | grep keystone, which should show you several keystone-all processes. The output should look similar to the following output:

Checking the Keystone service

You can also check this by running pgrep -l keystone. The output from this command should look similar to this output:

Checking the Keystone service

Checking the Keystone client

You can use the openstack client or the keystone command-line client to double check whether Keystone is running properly. Before you use the client, make sure that you have sourced the credentials in your openrc file or be prepared to pass the required auth attributes in with the command. If you forget to take one of these steps, you may see an error like the following...

Summary

In this chapter, we looked at how to resolve common issues with the Identity service. We learned how to tell which version of the Keystone API we are using and also looked at how to use the command-line interface clients to troubleshoot. We made calls to the Identity API in order to confirm that Keystone was running as expected and learned to troubleshoot issues with the Keystone database. We also checked the service catalog to make sure endpoints were properly configured and successfully ran Keystone as a WSGI application under Apache.

Keystone plays a central role in the successful operation of an OpenStack cluster. Each of the other OpenStack services depend on Keystone and the functionality it provides. As a result, successful troubleshooters will need to make sure that Keystone is running correctly. In the next chapter, we will look at how to troubleshoot the OpenStack Image service, code named Glance.

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Key benefits

  • *Easily fix the nagging problems that commonly plague OpenStack and become the go-to person in your organization
  • *Get better equipped to troubleshoot and solve common problems in performance, availability, and automation that confront production-ready OpenStack environments
  • *Save time and decrease frustration by solving significant issues that arise from OpenStack deployments pertaining to storage and networking

Description

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.

Who is this book for?

You will need a basic understanding of OpenStack, Linux, and Cloud computing. If you have an understanding of Linux, this book will help you leverage that knowledge in the world of OpenStack, giving you confidence to tackle most issues that may arise.

What you will learn

  • *Diagnose and remediate authentication and authorization problems in Keystone
  • *Fix common issues with images served through Glance
  • *Master the art of troubleshooting Neutron networking
  • *Navigate and overcome problems with Nova
  • *Troubleshoot and resolve Cinder block storage issues
  • *Identify and correct Swift object storage problems
  • *Isolate and fix issues caused by Heat orchestration
  • *Leverage Ceilometer and other metering and monitoring tools for effective troubleshooting
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Publication date, Length, Edition, Language, ISBN-13
Publication date : Mar 22, 2016
Length: 170 pages
Edition : 1st
Language : English
ISBN-13 : 9781783986880
Vendor :
OpenStack

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Length: 170 pages
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Language : English
ISBN-13 : 9781783986880
Vendor :
OpenStack

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Table of Contents

11 Chapters
1. The Troubleshooting Toolkit Chevron down icon Chevron up icon
2. Troubleshooting OpenStack Identity Chevron down icon Chevron up icon
3. Troubleshooting the OpenStack Image Service Chevron down icon Chevron up icon
4. Troubleshooting OpenStack Networking Chevron down icon Chevron up icon
5. Troubleshooting OpenStack Compute Chevron down icon Chevron up icon
6. Troubleshooting OpenStack Block Storage Chevron down icon Chevron up icon
7. Troubleshooting OpenStack Object Storage Chevron down icon Chevron up icon
8. Troubleshooting the OpenStack the Orchestration Service Chevron down icon Chevron up icon
9. Troubleshooting the OpenStack Telemetry Service Chevron down icon Chevron up icon
10. OpenStack Performance, Availability, and Reliability Chevron down icon Chevron up icon
Index Chevron down icon Chevron up icon

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Good book, but it is for a simple environment . My environment is more complicated . Three controller nodes and Ceph is in our environment
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