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 explored situations of node failures and essential techniques for malfunctioning cluster members, along with some essential cluster concepts in greater depth. In addition to this, we saw how to add cluster resources in order to further configure our newly created cluster into a real-world usage case, which we will deal with during the next chapter.

It is also worth reiterating that there are certain hardware components that we have not been able to discuss in detail, such as fencing devices, and you should take note of the fencing agents and devices (as per pcs stonith list) and see if any of them applies to the available hardware in your case.

Last but not least, you need to remember that in order to avoid split-brain situations, besides applying thoroughly the concepts outlined in the present chapter, you also need to ensure redundant communication links between the networks where the nodes are located. This will help you prevent a Single Point Of Failure (SPOF...