The book will guide you through the process of installing, configuring, and administering a multinode computer cluster on CentOS version 6 and 7 using two different cluster suites with respect to the CentOS version.
Chapter 1, Getting Started with High Availability, provides facts about high availability.
Chapter 2, Meet the Cluster Stack on CentOS, shows you how cluster stack software works as a whole to provide high availability.
Chapter 3, Cluster Stack Software on CentOS 6, covers installation and configuration of cluster stack software on CentOS 6.
Chapter 4, Resource Manager on CentOS 6, teaches you how to manage your cluster resources and services with the RGManager resource manager on CentOS 6.
Chapter 5, Playing with Cluster Nodes on CentOS 6, explains how to manage and administer cluster nodes on CentOS 6.
Chapter 6, Fencing on CentOS 6, provides the details and recommendations on the quorum disk on CentOS 6.
Chapter 7, Testing Failover on CentOS 6, discovers cluster node fencing on CentOS 6.
Chapter 8, Two-node Cluster Considerations on CentOS 6, covers some final cluster failover tests on CentOS 6.
Chapter 9, Cluster Stack Software on CentOS 7, shows you how to install and configure cluster stack software on CentOS 7.
Chapter 10, Resource Manager on CentOS 7, teaches you how to manage your cluster resources and services with the Pacemaker resource manager on CentOS 7.
Chapter 11, Playing with Cluster Nodes on CentOS 7, explains how to manage and administer cluster nodes on CentOS 7.
Chapter 12, STONITH on CentOS 7, introduces the details and recommendations on quorum disk on CentOS 7.
Chapter 13, Testing Failover on CentOS 7, covers cluster node fencing, the so-called STONITH, on CentOS 7.
Chapter 14, Two-node Cluster Considerations on CentOS 7, provides some final cluster failover tests on CentOS 7.
To closely follow the guides provided in this book, three virtual or physical machines with a working CentOS version 6 or 7 installation are required. The machines must have Internet connectivity to provide successful software installation, and local network connectivity to provide normal cluster operation.
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 how to practically achieve high availability with CentOS Linux. You are expected to have good knowledge of CentOS Linux and basic networking experience.
In this book, you will find a number of text styles that distinguish between different kinds of information. Here are some examples of these styles and an explanation of their meaning.
Code words in text, database table names, folder names, filenames, file extensions, pathnames, dummy URLs, user input, and Twitter handles are shown as follows: "If you want to change this, edit the NTP configuration file in /etc/ntp.conf."
Any command-line input or output is written as follows:
[root@node-1 ~]# service ntpd start [root@node-1 ~]# chkconfig ntpd on
New terms and important words are shown in bold. Words that you see on the screen, for example, in menus or dialog boxes, appear in the text like this: "Check the Cluster Status parameter to confirm that the cluster node was removed from the cluster configuration."
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