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

Setting up a virtual IP for the cluster

As mentioned in Chapter 1, Cluster Basics and Installation on CentOS 7, since a cluster is by definition a group of computers (which we have been referring to as nodes or members) that work together so that the set is seen as a single system from the outside, we need to ensure that end users and clients see it that way.

For this reason, the last thing that we will do in this chapter is configure a virtual IP, which is the address that external clients will use to connect to our cluster. Note that in an ordinary, non-cluster environment, you can use tools, such as ifconfig to configure a virtual IP for your system.

However, in our case, we will use nothing more and nothing less than PCS and perform two operations at once:

  • Creating the IPv4 address

  • Assigning it to the cluster as a whole

Adding a virtual IP as a cluster resource

Since a virtual IP is what is called a cluster resource, we will use pcs resource help to look for information on to how to create...