Create high availability clusters to enhance system performance using CentOS 7 About This Book * Master the concepts of high performance and high availability to eliminate performance bottlenecks * Maximize the uptime of services running in a CentOS 7 cluster * A step-by-step guide that will provide knowledge of methods and approaches to optimize the performance of CentOS clusters Who This Book Is For This book is targeted at system administrators: those who want a detailed, step-by-step guide to learn how to set up a high-availability CentOS 7 cluster, and those who are looking for a reference book to help them learn or refresh the necessary skills to ensure their systems and respective resources are utilized optimally. No previous knowledge of high-availability systems is needed, though the reader is expected to have at least some degree of familiarity with any spin-off of the Fedora family of Linux distributions, preferably CentOS. What You Will Learn * Install a CentOS 7 cluster and network infrastructure * Configure firewall, networking, and clustering services and settings * Set up and test a HAC (high-availability cluster) to host an Apache web server and a MariaDB database server * Monitor performance and availability * Identify bottlenecks and troubleshoot issues * Improve performance and ensure high availability In Detail 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. Style and approach An easy-to-follow and step-by-step guide with hands-on instructions to set up real-world simple cluster scenarios that will start you on the path to building more complex applications on your own.

Master the Powerful Management Tools of Oracle Solaris 11.2 Govern a reliable and secure enterprise cloud computing infrastructure using the detailed information contained in this Oracle Press guide. Oracle Solaris 11 System Administration Handbook offers end-to-end deployment, configuration, and management instruction. Find out how to install and update Oracle Solaris 11.2, migrate data and applications, build bare-metal and virtual networks, and tune performance. This comprehensive resource fully explains new features, including OpenStack cloud support, Unified Archive provisioning, and Oracle Solaris Zones. * Install Oracle Solaris 11.2 on SPARC and x86 systems * Virtualize and sandbox applications with Oracle Solaris Zones * Handle the complete software lifecycle to ensure systems are appropriately patched * Create both physical and virtual networks and control bandwidth * Implement reliable, secure infrastructure with automated compliance reporting * Install software from pre-configured Unified Archives or custom IPS repositories * Manage configuration on a large scale with SMF, Puppet, and RAD * Administer cloud-based compute, storage, and networking resources using OpenStack

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Unleash the power of shell scripts to solve real-world problems by breaking through the practice of writing tedious code About This Book * Learn how to efficiently and effectively build shell scripts and develop advanced applications with this handy book * Develop high quality and efficient solutions by writing professional and real-world scripts, and debug scripts by checking and shell tracing * A step-by-step tutorial to automate routine tasks by developing scripts from a basic level to very advanced functionality Who This Book Is For This book is ideal for those who are proficient at working with Linux and who want to learn about shell scripting to improve their efficiency and practical skills. By the end of this book, you will be able to confidently use your own shell scripts in the real world. What You Will Learn * Familiarize yourself with the various text filtering tools available in Linux * Combine the fundamental text and file processing commands to process data and automate repetitive tasks * Understand expressions and variables and how to use them practically * Automate decision-making and save a lot of time and effort of revisiting code * Get to grips with advanced functionality such as using traps and signals and using dialogs to develop screens * Start up a system and customize a Linux system * Take an in-depth look at regular expressions and pattern matching to understand the capabilities of scripting In Detail Linux is the one of the most powerful and universally adopted OSes. Shell is a program that gives the user direct interaction with the operating system. Scripts are collections of commands that are stored in a file. The shell can read this file and act on the commands as if they were typed on the keyboard. Shell scripting is used to automate day-to-day administration, and for testing or product development tasks. This book covers Bash, GNU Bourne Again SHell, preparing you to work in the exciting world of Linux shell scripting. We start with an introduction to the Shell environment and explain basic commands used in Shell. Next we move on to check, kill, and control the execution of processes in Linux OS. Further, we teach you about the filter tools available in Linux and explain standard output and standard errors devices. Then we will ensure you understand Shell's interpretation of commands and get a firmer grasp so you use them in practice. Next, you'll experience some real-world essentials such as debugging and perform Shell arithmetic fluently. Then you'll take a step ahead and learn new and advanced topics in Shell scripting, such as starting up a system and customizing a Linux system. Finally, you'll get to understand the capabilities of scripting and learn about Grep, Stream Editor, and Awk. Style and approach This practical book will go from the very basics of shell scripting to complex, customized automation. The idea behind this book is to be as practical as possible and give you the look and feel of what real-world scripting is like.

Acquire skills to manage your IT infrastructure effectively with Puppet About This Book * Breeze through Puppet 4's key features and performance improvements to bring real advantage to your IT infrastructure * Discover Puppet best practices to help you avoid common mistakes and pitfalls * Blitz through easy-to-follow examples to get to grips with Puppet and succeed with everyday IT automation Who This Book Is For If you're an experienced IT professional and a new Puppet user, this book will provide you with all you need to know to go from installation to advanced automation in no time at all. Get a rapid introduction to the essential topics and then tackle Puppet for advanced automation. What You Will Learn * Write and employ individual Puppet manifests * Understand how Puppet implements system abstraction * Deploy the Puppet master and agents * Leverage and extend Facter to summarize your systems * Create modular and reusable Puppet code * Extend your code base with publicly available Puppet modules * Use the modern features of Puppet 4 * Separate logic from data using Hiera In Detail Puppet is a configuration management tool that allows you to automate all your IT configurations, giving you control over what you do to each Puppet Agent in a network, and when and how you do it. In this age of digital delivery and ubiquitous Internet presence, it's becoming increasingly important to implement scalable and portable solutions, not only in terms of software, but also the systems that run it. The free Ruby-based tool Puppet has established itself as the most successful solution to manage any IT infrastructure. Ranging from local development environments through complex data center setups to scalable cloud implementations, Puppet allows you to handle them all with a unified approach. Puppet 4 Essentials, Second Edition gets you started rapidly and intuitively as you'll put Puppet's tools to work right away. It will also highlight the changes associated with performance improvements as well as the new language features in Puppet 4. We'll start with a quick introduction to Puppet to get you managing your IT systems quickly. You will then learn about the Puppet Agent that comes with an all-in-one (AIO) package and can run on multiple systems. Next, we'll show you the Puppet Server for high-performance communication and passenger packages. As you progress through the book, the innovative structure and approach of Puppet will be explained with powerful use cases. The difficulties that are inherent to a complex and powerful tool will no longer be a problem for you as you discover Puppet's fascinating intricacies. By the end of the book, you will not only know how to use Puppet, but also its companion tools Facter and Hiera, and will be able to leverage the flexibility and expressive power implemented by their tool chain. Style and approach This quick learning guide for Puppet follows a practical approach, starting with some basic commands that you can use from the shell right away. It comprises a series of examples that will get you familiar with the most important aspects of Puppet in a flash.

Learn shell scripting to solve complex shell-related problems and to efficiently automate your day-to-day tasks About This Book * Familiarize yourself with the terminal by learning about powerful shell features * Automate tasks by writing shell scripts for repetitive work * Packed with easy-to-follow, hands-on examples to help you write any type of shell script with confidence Who This Book Is For This book is aimed at administrators and those who have a basic knowledge of shell scripting and who want to learn how to get the most out of writing shell scripts. What You Will Learn * Write effective shell scripts easily * Perform search operations and manipulate large text data with a single shell command * Modularize reusable shell scripts by creating shell libraries * Redirect input, output, and errors of a command or script execution to other streams * Debug code with different shell debugging techniques to make your scripts bug-free * Manage processes, along with the environment variables needed to execute them properly * Execute and embed other languages in your scripts * Manage creation, deletion, and search operations in files In Detail Shell scripting is a quick method to prototype complex applications or problems. Shell scripts are a collection of commands to automate tasks, usually those for which the user has a repeated need, when working on Linux-based systems. Using simple commands or a combination of them in a shell can solve complex problems easily. This book starts with the basics, including essential commands that can be executed on Linux systems to perform tasks within a few nanoseconds. You'll learn to use outputs from commands and transform them to show the data you require. Discover how to write shell scripts easily, execute script files, debug, and handle errors. Next, you'll explore environment variables in shell programming and learn how to customize them and add a new environment. Finally, the book walks you through processes and how these interact with your shell scripts, along with how to use scripts to automate tasks and how to embed other languages and execute them. Style and approach This book is a pragmatic guide to writing efficient shell programs, complete with hands-on examples and tips.