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 chapter, we have explained how to monitor, troubleshoot, and fix common cluster problems and needs. Not all of these will be undesired or unexpected as a sudden system crash. There will be times when you need to bring down the cluster and the resources it is running for some planned maintenance or during a power outage before your uninterruptible power supply (UPS) runs out.

Because prevention is your best ally in these circumstances, ensure that you routinely monitor the health of your cluster. Follow the procedures outlined in this chapter so that you don't run into any surprises when real emergencies come up. Specifically, under either real or simulated cases, ensure that you back up the cluster configuration, stop the cluster on both nodes separately, and then and only then, halt the node.