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 and starting clustering services

Having reviewed the key networking concepts that were outlined earlier, we are now ready to start describing the cluster services.

Starting and enabling clustering services

You will recall from the previous chapter that we installed the following clustering components:

  • Pacemaker: This is the cluster resource manager

  • Corosync: This is the messaging service

  • PCS: This is the synchronization and configuration tool

As you can probably guess from the preceding list, these components should run as daemons, a special type of process that runs in the background without the need of direct intervention or control of an administrator. Although we installed the necessary packages in Chapter 1, Cluster Basics and Installation on CentOS 7, we did not start the cluster resource manager or the messaging services. So, we now need to start them manually for the first time and enable them to run automatically on startup during the next system boot.

We will start by configuring...