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

Chapter 4. Real-world Implementations of Clustering

In this chapter, you will learn how to use your cluster in real-life scenarios by deploying a web server and a database server. Before we do this, we will need to review some fundamental concepts related to these key components, configure replicated storage so that files are kept in sync between nodes, and then finally, populate our database with sample data, which we will then query using a simple PHP application.

Since the programming side of things is out of the scope of this book, feel free to use some other programming language of your choice if you want to do so. I have chosen PHP for simplicity. Keep in mind that this book is not aimed at teaching you how to build web-based applications for use in a CentOS 7 cluster, but rather how to use it in order to provide high availability for those applications.

During the course of this chapter, you will notice that we will rely on the concepts introduced and the services configured in previous...