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  • Book Overview & Buying CentOS High Availability
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CentOS High Availability

CentOS High Availability

By : Mitja Resman
4.5 (12)
Buy this Book
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CentOS High Availability

CentOS High Availability

4.5 (12)
By: Mitja Resman
Buy this Book

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.
Table of Contents (16 chapters)
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Preface
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Preface
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What this book covers
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What you need for this book
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Who this book is for
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Conventions
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Reader feedback
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Customer support
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1
1. Getting Started with High Availability
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1. Getting Started with High Availability
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What is high availability?
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System design
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Computer clusters
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High-availability solutions
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Summary
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2. Meet the Cluster Stack on CentOS
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2. Meet the Cluster Stack on CentOS
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Cluster stack software
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The cluster communication layer
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The cluster resource management layer
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A theoretical cluster service example
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Cluster stack on CentOS Linux
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Preparing for cluster stack software installation
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Summary
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3. Cluster Stack Software on CentOS 6
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3. Cluster Stack Software on CentOS 6
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Cluster infrastructure
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Cluster operating system preparation
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Installing and configuring Corosync
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Installing and configuring CMAN
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Summary
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4. Resource Manager on CentOS 6
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4. Resource Manager on CentOS 6
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Working with RGManager
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Configuring failover domains
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Adding cluster resources and services
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Managing cluster services
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Removing cluster resources and services
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Summary
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5. Playing with Cluster Nodes on CentOS 6
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5. Playing with Cluster Nodes on CentOS 6
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Adding a new cluster node
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Removing a cluster node
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Summary
6
6. Fencing on CentOS 6
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6. Fencing on CentOS 6
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Fencing
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Fencing configuration
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IPMI management board fencing
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HP iLO management board fencing
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Fencing test
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Summary
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7. Testing Failover on CentOS 6
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7. Testing Failover on CentOS 6
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Hardware failure
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Network failure
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Summary
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8. Two-node Cluster Considerations on CentOS 6
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8. Two-node Cluster Considerations on CentOS 6
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Quorum in a two-node cluster
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Two-node cluster configuration
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Quorum disk
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Summary
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9. Cluster Stack Software on CentOS 7
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9. Cluster Stack Software on CentOS 7
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Cluster infrastructure
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Installing and configuring Corosync
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Summary
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10. Resource Manager on CentOS 7
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10. Resource Manager on CentOS 7
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Working with pcs
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Adding cluster resources, constraints, and resource groups
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Managing resources
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Removing cluster constraints, resource groups, and resources
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Summary
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11. Playing with Cluster Nodes on CentOS 7
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11. Playing with Cluster Nodes on CentOS 7
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Adding a new cluster node
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Cluster node standby mode
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Removing a cluster node
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Summary
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12. STONITH on CentOS 7
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12. STONITH on CentOS 7
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Fencing
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Configuring fence devices
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IPMI management board fencing
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HP iLO management board fencing
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Fence test
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Summary
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13. Testing Failover on CentOS 7
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13. Testing Failover on CentOS 7
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Hardware failure
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Network failure
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Summary
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14. Two-node Cluster Considerations on CentOS 7
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14. Two-node Cluster Considerations on CentOS 7
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Quorum in a two-node cluster
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Two-node cluster configuration
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Summary
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Index
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Index

Cluster node standby mode

Pacemaker allows you to put the desired cluster node into standby mode. When a cluster node is in standby mode, it will no longer be able to host cluster resources and services. The standby mode is useful for cluster node maintenance operations.

The syntax to put a cluster node in standby mode is as follows:

pcs cluster standby node_name

Here, the node_name parameter is the name of the cluster node you want to put in standby mode as it appears when running the pcs status command.

The following is the syntax used to take a cluster node out of standby mode:

pcs cluster unstandby node_name

Here, the node_name parameter is the name of the cluster node you want to take out standby mode as it appears when running the pcs status command.

You can put a cluster node called node-4.geekpeek.net into standby mode with the following command:

pcs cluster standby node-4.geekpeek.net

In this screenshot, you can see the command used to put the node-4.geekpeek.net cluster node in standby...

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