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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 constraints, resource groups, and resources

Knowing how to remove the configured cluster constraints, resource groups, and resources is just as important as knowing how to configure them. Removing them is quite easy and self-explanatory.

Removing resource constraints

You can see the configured cluster resource constraints with the following command:

pcs constraint show

In the following screenshot, you can see the output of the pcs constraint show command.

Removing resource constraints

As you can see in the preceding screenshot, the possible configured location constraints are:

  • Location constraints: None configured
  • Ordering constraints: The cluster resource order constraint is set to start the resource called ClusterIP before the resource called WebServer
  • Colocation constraints: The cluster resource colocation constraint is configured to run resources ClusterIP and WebServer together
  • You can delete the cluster order constraint from the preceding example with the following command:
    pcs constraint order remove...
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