Book Image

CentOS High Performance

By : Gabriel Cánepa
Book Image

CentOS High Performance

By: Gabriel Cánepa

Overview of this book

CentOS is the enterprise level Linux OS, which is 100% binary compatible to Red Hat Enterprise Linux (RHEL). It acts as a free alternative to RedHat's commercial Linux offering, with only a change in the branding. A high performance cluster consists in a group of computers that work together as one set parallel, hence minimizing or eliminating the downtime of critical services and enhancing the performance of the application. Starting with the basic principles of clustering, you will learn the necessary steps to install a cluster with two CentOS 7 servers. We will then set up and configure the basic required network infrastructure and clustering services. Further, you will learn how to take a proactive approach to the split-brain issue by configuring the failover and fencing of the cluster as a whole and the quorum of each node individually. Further, we will be setting up HAC and HPC clusters as a web server and a database server. You will also master the art of monitoring performance and availability, identifying bottlenecks, and exploring troubleshooting techniques. At the end of the book, you’ll review performance-tuning techniques for the recently installed cluster, test performance using a payload simulation, and learn the necessary skills to ensure that the systems, and the corresponding resources and services, are being utilized to their best capacity.
Table of Contents (13 chapters)
CentOS High Performance
About the Author
About the Reviewers

Installing and configuring a STONITH device

It is worth noting that a STONITH device is a cluster resource that will be used to bring down a malfunctioning or unresponsive node. Installing the following packages on both nodes will make several STONITH devices available in our cluster. If you are setting up your 2-node cluster with two virtual machines, as suggested early in Chapter 1, Cluster Basics and Installation on CentOS 7, install the following packages on both nodes:

yum update && yum install fence-agents-all fence-virt

Once the installation is complete, you can list all the available agents with the pcs stonith list command, as shown in the next screenshot.

Each of the listed devices in the following screenshot are described by several available parameters, which can be shown with pcs stonith describe agent, where you must replace agent with the corresponding name of the resource. Note that we will use these parameters when we actually configure the STONITH device in a later...