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CentOS High Availability

You're reading from CentOS High Availability Leverage the power of high availability clusters on CentOS Linux, the enterprise-class, open source operating system

Product type Paperback

Published in Apr 2015

Publisher

ISBN-13 9781785282485

Length 174 pages

Edition 1st Edition

Tools

CentOS

Concepts

High Performance Programming

Table of Contents (16) Chapters

Preface

1. Getting Started with High Availability FREE CHAPTER

2. Meet the Cluster Stack on CentOS

3. Cluster Stack Software on CentOS 6

4. Resource Manager on CentOS 6

5. Playing with Cluster Nodes on CentOS 6

6. Fencing on CentOS 6

7. Testing Failover on CentOS 6

8. Two-node Cluster Considerations on CentOS 6

9. Cluster Stack Software on CentOS 7

10. Resource Manager on CentOS 7

11. Playing with Cluster Nodes on CentOS 7

12. STONITH on CentOS 7

13. Testing Failover on CentOS 7

14. Two-node Cluster Considerations on CentOS 7

Index

Fencing

Fencing is an important cluster task. It isolates a computer's cluster node when the node misbehaves, in order to protect the shared cluster resources and prevent cluster disruption. Fencing should not be used in a two-node cluster configuration because the nodes may go on a killing spree and kill each other. To work around this issue, you should implement a Quorum disk, as explained in Chapter 8, Two-node Cluster Considerations on CentOS 6. If you do not configure fencing, a misbehaving computer cluster node can corrupt the cluster data. This is why it is necessary to exclude the problematic cluster node from cluster configuration immediately. The name of the daemon running all fencing actions is fenced.

STONITH is a fencing technique that stands for Shoot The Other Node In The Head. STONITH fences a failed cluster node by rebooting or turning it off.

The following fencing devices are most commonly used in cluster environments:

APC switch: APC switch is a rack mount automatic...

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