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Mastering Proxmox

You're reading from Mastering Proxmox Build virtualized environments using the Proxmox VE hypervisor

Product type Paperback

Published in Nov 2017

Publisher Packt

ISBN-13 9781788397605

Length 494 pages

Edition 3rd Edition

Tools

Ceph

Concepts

Cloud Computing

Author (1):

Wasim Ahmed

View More author details

Table of Contents (17) Chapters

Preface

1. Understanding Proxmox VE and Advanced Installation

2. Creating a Cluster and Exploring the Proxmox GUI FREE CHAPTER

3. Proxmox under the Hood

4. Storage Systems

5. Installing and Configuring Ceph

6. KVM Virtual Machines

7. LXC Virtual Machines

8. Network of Virtual Networks

9. The Proxmox VE Firewall

10. Proxmox High Availability

11. Monitoring the Proxmox Cluster

12. Proxmox Production-Level Setup

13. Back Up and Restore Virtual Machines

14. Updating/Upgrading Proxmox

15. Proxmox Troubleshooting

16. Rescuing Proxmox

Recovering from a quorum failure

There are various reason why a Proxmox cluster can lose a quorum. For the cluster to operate correctly, a quorum must exist within the nodes. A quorum is established when the majority of the nodes are online. If 51% of the nodes go offline for whatever reason, a quorum will be lost, resulting in a cluster error. A Proxmox quorum relies on multicast. So if multicast gets disabled in the switch, the cluster can also lose a quorum. A manual misconfiguration in the cluster file can also cause loss of a quorum. When a quorum is lost, the following error messages will appear in log files under /var/log/corosync:

......................
corosync[9999]:  [QUORUM] Quorum provider: corosync_votequorum failed to initialize.
corosync[9999]:  [SERV  ] Service engine 'corosync_quorum' failed to load for reason
    'configuration error: nodelist...

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Authors (1)

Ahmed

Ahmed

Asad Jibran Ahmed is an experienced programmer who has worked mostly with Django-based web applications for the past 5 years. Based in Dubai, UAE, he has worked with some of the biggest web properties in the region, including Dubizzle, the number one classifieds platform in UAE; Nabbesh, one of the top freelancing platforms in the MENA region; and Just Property, a hot and rising name in the property portal space of the region. His experience with such big names has given him a keen insight into how to design performant, stable, and user friendly web applications, all the while using programming practices that make sure that the code base is maintainable for years.

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