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


In this last chapter, we set up a couple of performance testing tools for the example services that you need to make highly available in your cluster, and provided a few suggestions to optimize their performance separately as well. Note that those suggestions are not intended to represent an exhaustive list of tuning methods, but a starting point instead. We have also provided the overall instructions so that you can convert an A/P cluster into an A/A one.

Finally, keep in mind that this book was written using virtual machines instead of specialized hardware. Thus, we have run into some associated limitations, such as the lack for real STONITH devices that would otherwise have allowed us to actually demonstrate the functionalities of an A/A cluster. However, the principles outlined in this book will undoubtedly be a guide to set up your own clusters, whether you are experimenting with virtual machines as well or using real hardware.

Best of success in your endeavors!