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  • Book Overview & Buying CentOS High Availability
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CentOS High Availability

CentOS High Availability

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

CentOS High Availability

4.5 (12)
By: 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
Lock Free Chapter
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
2
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
3
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
5
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
8
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
9
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

Installing and configuring Corosync

Now let's get down to business. You must configure the firewalld daemon on your cluster nodes to allow cluster communication traffic among the cluster nodes. Add a firewall rule to allow UDP traffic on 5404 and 5405, and reload the firewalld daemon. In the following screenshot, you can see the commands used for firewalld daemon reconfiguration to allow Corosync traffic:

Note

The default Corosync cluster communication ports are 5404 and 5405, on which the UDP protocol is used. The ports are configured in the /etc/corosync/corosync.conf configuration file. If you want to change the default Corosync communication ports, be sure to change the IPTables accordingly.

Install Corosync and make sure it is started at boot. In this screenshot, you can see the commands used to install Corosync:

Here is a screenshot showing you how to make Corosync start at boot time:

Note

Note that you must allow Corosync traffic by adding the firewalld rules, reload the firewalld service...

CONTINUE READING
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CentOS High Availability
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