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

Configuring our cluster with PCS GUI

If you followed the steps outlined in Chapter 2, Installing Cluster Services and Configuring Network Components, to enable the Hacluster account for cluster administration, we can also use the PCS GUI, a cluster management web interface, to manage clusters. This includes the ability to add, remove, and edit existing clusters.

To navigate to the PCS web interface, go to https://<ip_of_one_node>:2224 (note that it's https and not http), accept the security exceptions, and then log in using the credentials that were previously set for Hacluster, as shown in the following screenshot:

The next screen that you will see (which is as shown in the following screenshot) will present the menus to remove an existing cluster, add an existing cluster, or create a new one. When you click on the Add Existing button, you will be prompted to enter the hostname or IP address of a node that currently belongs to an existing cluster that you want to manage using the web...