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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

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Product type Paperback
Published in Apr 2015
Publisher
ISBN-13 9781785282485
Length 174 pages
Edition 1st Edition
Tools
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Toc

Table of Contents (16) Chapters Close

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

Removing cluster resources and services

Removing cluster resources and services is the reverse of adding them. Resources and services are removed by editing the CMAN configuration file and removing the lines that define the resources or services you would like to remove. When removing cluster resources, it is important to verify that the resources are not being used within any of the configured or running cluster services. As always, when editing the CMAN configuration file, the config_version parameter must be increased. Once the CMAN configuration file is edited, you must run the CMAN configuration validation check for errors. When the CMAN configuration file validation succeeds, you can distribute it to all other cluster nodes.

The procedure for removing cluster resources and services is as follows:

  1. Remove the desired cluster resources and services and increase the config_version number.
  2. Validate the CMAN configuration file.
  3. Distribute the CMAN configuration file to all other nodes.

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