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CentOS High Availability

By : Resman

4.5 (12)

CentOS High Availability

4.5 (12)

By: Resman

Overview of this book

This book is targeted at system engineers and system administrators who want to upgrade their knowledge and skills in high availability and want to learn practically how to achieve high availability with CentOS Linux. You are expected to have good CentOS Linux knowledge and basic networking experience.

Preface

Preface

What this book covers

What you need for this book

Who this book is for

Conventions

Reader feedback

Customer support

Free Chapter

1. Getting Started with High Availability

1. Getting Started with High Availability

What is high availability?

System design

Computer clusters

High-availability solutions

Summary

2. Meet the Cluster Stack on CentOS

2. Meet the Cluster Stack on CentOS

Cluster stack software

The cluster communication layer

The cluster resource management layer

A theoretical cluster service example

Cluster stack on CentOS Linux

Preparing for cluster stack software installation

Summary

3. Cluster Stack Software on CentOS 6

3. Cluster Stack Software on CentOS 6

Cluster infrastructure

Cluster operating system preparation

Installing and configuring Corosync

Installing and configuring CMAN

Summary

4. Resource Manager on CentOS 6

4. Resource Manager on CentOS 6

Working with RGManager

Configuring failover domains

Adding cluster resources and services

Managing cluster services

Removing cluster resources and services

Summary

5. Playing with Cluster Nodes on CentOS 6

5. Playing with Cluster Nodes on CentOS 6

Adding a new cluster node

Removing a cluster node

Summary

6. Fencing on CentOS 6

6. Fencing on CentOS 6

Fencing

Fencing configuration

IPMI management board fencing

HP iLO management board fencing

Fencing test

Summary

7. Testing Failover on CentOS 6

7. Testing Failover on CentOS 6

Hardware failure

Network failure

Summary

8. Two-node Cluster Considerations on CentOS 6

8. Two-node Cluster Considerations on CentOS 6

Quorum in a two-node cluster

Two-node cluster configuration

Quorum disk

Summary

9. Cluster Stack Software on CentOS 7

9. Cluster Stack Software on CentOS 7

Cluster infrastructure

Installing and configuring Corosync

Summary

10. Resource Manager on CentOS 7

10. Resource Manager on CentOS 7

Working with pcs

Adding cluster resources, constraints, and resource groups

Managing resources

Removing cluster constraints, resource groups, and resources

Summary

11. Playing with Cluster Nodes on CentOS 7

11. Playing with Cluster Nodes on CentOS 7

Adding a new cluster node

Cluster node standby mode

Removing a cluster node

Summary

12. STONITH on CentOS 7

12. STONITH on CentOS 7

Fencing

Configuring fence devices

IPMI management board fencing

HP iLO management board fencing

Fence test

Summary

13. Testing Failover on CentOS 7

13. Testing Failover on CentOS 7

Hardware failure

Network failure

Summary

14. Two-node Cluster Considerations on CentOS 7

14. Two-node Cluster Considerations on CentOS 7

Quorum in a two-node cluster

Two-node cluster configuration

Summary

Index

Index

Hardware failure

If your cluster node experiences a CPU, RAM, or motherboard failure, it is an unrecoverable failure and the cluster node will go offline. The cluster fencing mechanism will fence the problematic cluster node to make sure that it is no longer running and prevent the problematic cluster node from accessing the shared cluster storage. If your cluster node experiences disk failure, it should not be affected due to RAID disk redundancy. In the event of a disk failure, the cluster node should still be operational.

The cluster from the following example is configured to provide a WebSite resource group that includes a cluster IP address and Apache webserver instance. The WebSite resource group is running on the node-1.geekpeek.net cluster node. In the following screenshot, you can see the cluster status prior to the hardware failure test:

Hardware failure

You can proceed to simulate the node-1.geekpeek.net cluster node's hardware failure. You can do this by cutting off the power of the node...

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Tech Concepts

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Programming languages

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