Book Image

Mastering KVM Virtualization

Book Image

Mastering KVM Virtualization

Overview of this book

A robust datacenter is essential for any organization – but you don’t want to waste resources. With KVM you can virtualize your datacenter, transforming a Linux operating system into a powerful hypervisor that allows you to manage multiple OS with minimal fuss. This book doesn’t just show you how to virtualize with KVM – it shows you how to do it well. Written to make you an expert on KVM, you’ll learn to manage the three essential pillars of scalability, performance and security – as well as some useful integrations with cloud services such as OpenStack. From the fundamentals of setting up a standalone KVM virtualization platform, and the best tools to harness it effectively, including virt-manager, and kimchi-project, everything you do is built around making KVM work for you in the real-world, helping you to interact and customize it as you need it. With further guidance on performance optimization for Microsoft Windows and RHEL virtual machines, as well as proven strategies for backup and disaster recovery, you’ll can be confident that your virtualized data center is working for your organization – not hampering it. Finally, the book will empower you to unlock the full potential of cloud through KVM. Migrating your physical machines to the cloud can be challenging, but once you’ve mastered KVM, it’s a little easie.
Table of Contents (22 chapters)
Mastering KVM Virtualization
Credits
About the Authors
About the Reviewers
www.PacktPub.com
Preface
Index

Accessing the instance configuration database


All the instance configurations are stored in the nova database. Sometimes accessing the database gives good information for troubleshooting purposes. For example, Instance creation fails with an error. Identifying on which compute-node the particular instance was scheduled to run will give us a starting point for troubleshooting. The instance table in the nova database holds all the information, including the host details. To access the nova database, follow the following steps:

  1. SSH into the your OpenStack AIO system and run the mysql command to get into the database:

    # mysql
    Welcome to the MariaDB monitor.  Commands end with ; or \g.
    Your MariaDB connection id is 559251
    Server version: 5.5.42-MariaDB-wsrep MariaDB Server, wsrep_25.11.r4026
          Copyright (c) 2000, 2015, Oracle, MariaDB Corporation Ab and others. 
           Type 'help;' or '\h' for help. Type '\c' to clear the current input statement.
           MariaDB [(none)]> 
    
  2. At the MariaDB...