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CentOS High Availability

You're reading from CentOS High Availability

Product type Book

Published in Apr 2015

Publisher

ISBN-13 9781785282485

Pages 174 pages

Edition 1st Edition

Languages

Concepts

High Performance Programming

Table of Contents (21) Chapters

CentOS High Availability

Credits

About the Author

About the Reviewers

www.PacktPub.com

Preface

1. Getting Started with High Availability

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 cluster node when the node misbehaves in order to protect the shared cluster resources and prevent cluster disruption. 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. Corosync version 2 fencing implements some additional configurable parameters that can be applied to allow fencing configuration in a two-node cluster configuration and ensure normal operation of such a cluster. The details of this are described in Chapter 14, Two-node Cluster Considerations on CentOS 7.

In Pacemaker, fencing is called STONITH. STONITH is a fencing technique that stands for Shoot The Other Node In The Head. STONITH fences failed cluster nodes by rebooting or powering the node off.

The node fencing cluster feature is provided by fencing agents. Fencing agents are scripts that get executed...

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