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

Introducing initial cluster tests

In addition, for the actual performance tests, you should note that MariaDB comes with several database-related utilities that can come in handy for a variety of administration tasks. One of them is mysqlshow, which returns complete information about databases and tables in one quick command.

Its generic syntax is as follows:

mysqlshow [options] [db_name [tbl_name [col_name]]]

So, we could use the following command to display the description for the titles table in the employees database:

mysqlshow employees titles -h -u root -p


You can list the complete set of utilities that are included in your MariaDB installation using the ls /bin | grep mysql command. Each of those tools has a corresponding manual page, which can be invoked from the command line as usual.

We will use another of the tools that are included by MariaDB to see how our database server performs when placed under significant load. The tool is mysqlslap, a diagnostic program designed...