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Troubleshooting Ruby Processes by Philippe Hanrigou Pdf
This is the eBook version of the printed book. This short cut introduces key system diagnostic tools to Ruby developers creating and deploying web applications. When programmers develop a Ruby application they commonly experience complex problems which require some understanding of the underlying operating system to be solved. Difficult to diagnose, these problems can make the difference between a project's failure or success. This short cut demonstrates how to leverage system tools available on Mac OS X, Linux, Solaris, BSD or any other Unix flavor. You will learn how to leverage the raw power of tools such as lsof, strace or gdb to resolve problems that are difficult to diagnose with the standard Ruby development tools. You will also find concrete examples that illustrate how these tools solve real-life problems in Ruby development. This expertise will prove especially relevant during the deployment phase of your application. In this way, should your production Mongrel cluster freeze and stop serving HTTP requests, it will not take you 2 days to figure out why!
Troubleshoot your Puppet infrastructure to leverage your system's performance effectively About This Book Covers major tools in Puppet deployment Fix catalog compilation problems and deal with issues found in larger deployments, such as scaling and improving performance. A fast-paced guide with real-world examples Who This Book Is For If you are a beginner to intermediate Puppet Engineer looking for guidance to help fix problems with your Puppet deployments, this book is for you. What You Will Learn Debug your Puppet infrastructure Use APIs to ensure services are working properly Fix catalog compilation issues Solve problems using Hiera tool Detect problems in your environment using PuppetDB tool Learn ways to format code to aid in identifying errors Troubleshoot errors in modules and templates In Detail Puppet is a configuration management system written for system administrators to manage a large number of systems efficiently and help maintain order. Deploying Puppet becomes more complex as you increase the number of nodes in your environment. The Puppet tool is an intelligent solution that increases the automation footprint for the proactive management of server infrastructures. Puppet's simple programming language is usable on most operating systems and is portable on different deployment environments. We begin by looking at the puppet.conf server configuration file, and talk about possible problems that can occur. What does puppet really do in the background and what options does it provide for troubleshooting? This is what we will explore. Moving on, we will be troubleshooting errors made in modules and templates, finding the best solutions. We will be writing code that will helping us in identify errors. Then we will explain how several ENCs do their job and how puppet communicates with them. We will learn how PuppetDB collects data generated by Puppet. It also enables advanced Puppet features like exported resources, and can be the foundation for other applications that use Puppet's data. By the end of the book we will have learned the best debugging tips for Puppet and PuppetServer. Style and approach This is a quick-paced guide packed with real-world examples and solutions to obstacles in your Puppet infrastructure.
Praise for Design Patterns in Ruby "Design Patterns in Ruby documents smart ways to resolve many problems that Ruby developers commonly encounter. Russ Olsen has done a great job of selecting classic patterns and augmenting these with newer patterns that have special relevance for Ruby. He clearly explains each idea, making a wealth of experience available to Ruby developers for their own daily work." —Steve Metsker, Managing Consultant with Dominion Digital, Inc. "This book provides a great demonstration of the key 'Gang of Four' design patterns without resorting to overly technical explanations. Written in a precise, yet almost informal style, this book covers enough ground that even those without prior exposure to design patterns will soon feel confident applying them using Ruby. Olsen has done a great job to make a book about a classically 'dry' subject into such an engaging and even occasionally humorous read." —Peter Cooper "This book renewed my interest in understanding patterns after a decade of good intentions. Russ picked the most useful patterns for Ruby and introduced them in a straightforward and logical manner, going beyond the GoF's patterns. This book has improved my use of Ruby, and encouraged me to blow off the dust covering the GoF book." —Mike Stok "Design Patterns in Ruby is a great way for programmers from statically typed objectoriented languages to learn how design patterns appear in a more dynamic, flexible language like Ruby." —Rob Sanheim, Ruby Ninja, Relevance Most design pattern books are based on C++ and Java. But Ruby is different—and the language's unique qualities make design patterns easier to implement and use. In this book, Russ Olsen demonstrates how to combine Ruby's power and elegance with patterns, and write more sophisticated, effective software with far fewer lines of code. After reviewing the history, concepts, and goals of design patterns, Olsen offers a quick tour of the Ruby language—enough to allow any experienced software developer to immediately utilize patterns with Ruby. The book especially calls attention to Ruby features that simplify the use of patterns, including dynamic typing, code closures, and "mixins" for easier code reuse. Fourteen of the classic "Gang of Four" patterns are considered from the Ruby point of view, explaining what problems each pattern solves, discussing whether traditional implementations make sense in the Ruby environment, and introducing Ruby-specific improvements. You'll discover opportunities to implement patterns in just one or two lines of code, instead of the endlessly repeated boilerplate that conventional languages often require. Design Patterns in Ruby also identifies innovative new patterns that have emerged from the Ruby community. These include ways to create custom objects with metaprogramming, as well as the ambitious Rails-based "Convention Over Configuration" pattern, designed to help integrate entire applications and frameworks. Engaging, practical, and accessible, Design Patterns in Ruby will help you build better software while making your Ruby programming experience more rewarding.
The expert guide to building Ruby on Rails applications Ruby on Rails strips complexity from the development process, enabling professional developers to focus on what matters most: delivering business value. Now, for the first time, there’s a comprehensive, authoritative guide to building production-quality software with Rails. Pioneering Rails developer Obie Fernandez and a team of experts illuminate the entire Rails API, along with the Ruby idioms, design approaches, libraries, and plug-ins that make Rails so valuable. Drawing on their unsurpassed experience, they address the real challenges development teams face, showing how to use Rails’ tools and best practices to maximize productivity and build polished applications users will enjoy. Using detailed code examples, Obie systematically covers Rails’ key capabilities and subsystems. He presents advanced programming techniques, introduces open source libraries that facilitate easy Rails adoption, and offers important insights into testing and production deployment. Dive deep into the Rails codebase together, discovering why Rails behaves as it does— and how to make it behave the way you want it to. This book will help you Increase your productivity as a web developer Realize the overall joy of programming with Ruby on Rails Learn what’s new in Rails 2.0 Drive design and protect long-term maintainability with TestUnit and RSpec Understand and manage complex program flow in Rails controllers Leverage Rails’ support for designing REST-compliant APIs Master sophisticated Rails routing concepts and techniques Examine and troubleshoot Rails routing Make the most of ActiveRecord object-relational mapping Utilize Ajax within your Rails applications Incorporate logins and authentication into your application Extend Rails with the best third-party plug-ins and write your own Integrate email services into your applications with ActionMailer Choose the right Rails production configurations Streamline deployment with Capistrano
Case Studies in Clinical Psychological Science by William O'Donohue,Scott O. Lilienfeld Pdf
In the past few decades clinical science has emerged as a prominent model for training and practice in clinical psychology. This model emphasizes evidence derived from high-quality research and is consistent with the increasingly influential evidence-based movement in medicine, which is a vital step toward making psychotherapy more effective, efficient, and safe. Despite this trend, much current psychological practice is not evidence-based; moreover, there is a marked dearth of resources available to train students and assist practitioners with the challenging goal of translating science into practice. Case Studies in Clinical Psychological Science demonstrates in detail how the clinical science model can be applied to actual cases. Edited by Professors William O'Donohue and Scott O. Lilienfeld, this book's unique structure presents dialogues between leading clinical researchers regarding the treatment of a wide variety of psychological problems, from depression and Alzheimer's disease to Panic Disorder and chronic pain. Chapters describe what evidence-based practice consists of for various clinical problems and are followed by commentary sections in which other leading clinical researchers analyze the case at hand, pointing out additional assessment and treatment options and controversial issues. The chapter authors then reply to the commentary in response sections. By examining the application of scientifically based interventions to actual cases and modeling thoughtful and collegial discussion among prominent clinical researchers, Case Studies in Clinical Psychological Science will assist students, practitioners, and clinical researchers with the crucial task of applying research evidence to psychotherapy and bridging the gap between science and practice.
Investigate and solve problems with Nginx-powered websites using a deep understanding of the underlying principles About This Book Solve problems with your Nginx-powered websites before your audience notices anything Peek into the Nginx architecture and gain knowledge that will help you be valuable to you in the long run Gain knowledge of different types of problems in a step-by-step way Who This Book Is For The book is for technical specialists who already use Nginx to serve web pages for their users. Whether you are an experienced system administrator or a new professional, this book will help you do your job in the most efficient way. What You Will Learn Detect and investigate problems with your web servers Create correct and professional configuration files Get an in-depth understanding of the web server software Interpret Nginx log files easily and with actionable insights Make your websites respond as fast as possible Prevent problems by setting up proper monitoring and alerts In Detail Nginx is clearly winning the race to be the dominant software to power modern websites. It is fast and open source, maintained with passion by a brilliant team. This book will help you maintain your Nginx instances in a healthy and predictable state. It will lead you through all the types of problems you might encounter as a web administrator, with a special focus on performance and migration from older software. You will learn how to write good configuration files and will get good insights into Nginx logs. It will provide you solutions to problems such as missing or broken functionality and also show you how to tackle performance issues with the Nginx server. A special chapter is devoted to the art of prevention, that is, monitoring and alerting services you may use to detect problems before they manifest themselves on a big scale. The books ends with a reference to error and warning messages Nginx could emit to help you during incident investigations. Style and approach This comprehensive tutorial on Nginx troubleshooting takes an practical approach to guiding you through common issues in Nginx server.
Programming Ruby 3.3 by Noel Rappin,Dave Thomas Pdf
Ruby is one of the most important programming languages in use for web development. It powers the Rails framework, which is the backing of some of the most important sites on the web. The Pickaxe Book, named for the tool on the cover, is the definitive reference on Ruby, a highly-regarded, fully object-oriented programming language. This updated edition is a comprehensive reference on the language itself, with a tutorial on the most important features of Ruby - including pattern matching and Ractors - and describes the language through Ruby 3.3. Would you like to go from first idea to working code much, much faster? Do you currently spend more time satisfying the compiler instead of your clients or end users? Are you frustrated with demanding languages that seem to get in your way instead of helping you get the work done? Are you using Rails and want to dig deeper into the underlying Ruby language? If so, then we've got a language and book for you! Ruby is a fully object-oriented language. The combination of the power of a pure object-oriented language with the convenience of a scripting language makes Ruby a favorite tool of programmers that want to get things done quickly and cleanly. This comprehensive reference manual for Ruby includes a description of the most important standard library modules, built-in classes, and modules. It also includes all the new and changed syntax and semantics introduced through Ruby 3.3, including pattern matching and Ractors, and describes the language through Ruby 3.3. What You Need: This book assumes you have a basic understanding of object-oriented programming. In general, Ruby programmers tend to favor the the command line for running their code, and they tend to use text editors rather than IDEs. Ruby runs on Windows, Linux, and MacOS.
Sams Teach Yourself Network Troubleshooting in 24 Hours by Jonathan Feldman Pdf
Covers topics including black box troubleshooting strategies, documentation, cable modems, wireless infrastructure, enterprise routers, and lag problems.
Nurturing the Nurturers by Bonnie Benard,Douglas Quiett Pdf
In the Marin City Families First early-intervention model, a home visitor plays a sweeping role in the life of the client family. The job is particularly challenging for those working with families in which financial uncertainty, substance abuse, feelings of oppression, inadequate education, and other poverty-related factors can breed depression, anger, and hopelessness. To become and remain effective, home visitors need a high degree of support. This report describes how home visitors support client families and how, in turn, home visitors receive support from the program supervisor. A case study introduces the reader to one family and their needs. It reveals the intensity of the home visitor's challenge and demonstrates how home visitors and the program supervisor work together to move the family forward.
Troubleshooting Docker by Vaibhav Kohli,Rajdeep Dua,John Wooten Pdf
Strategically design, troubleshoot, and automate Docker containers from development to deployment About This Book Utilize current and emergent technologies for effective Docker orchestration and management A step-by-step guide to diagnosing and fixing problems with Docker containers. Who This Book Is For This book is intended for seasoned solutions architects, developers, and programmers, system engineers, and administrators to help you troubleshoot common areas of Docker containerization. If you are looking to build production-ready Docker containers for automated deployment, you will be able to master and troubleshoot both the basic functions and the advanced features of Docker. Advanced familiarity with the Linux command line syntax, unit testing, the Docker Registry, Github, and leading container hosting platforms and Cloud Service Providers (CSP) are the prerequisites. What You Will Learn Install Docker ecosystem tools and services, Microservices and N-tier applications Create re-usable, portable containers with help of automation tools Network and inter-link containers Attach volumes securely to containers Consume and troubleshoot Docker APIs Troubleshooting issue of Docker deployment in Public cloud Ease the process of container management with Kubernetes In Detail This book will traverse some common best practices to for complex application scenarios where troubleshooting can be successfully employed to provide the repeatable processes and advantages that containers can deliver. This book will be a practical guide showing how to fix real-life issues related to installation, memory, Dockerfile syntax, connection, authorization, networking and so on in Docker. This book will also teach how to solve errors that occur during advanced setup and administration and deployment in a step-by-step fashion. By sequentially working through the real-world production scenarios in each chapter throughout the book, you will gain insight into and mastery of common areas not only for effective troubleshooting, but ways and means to avoid troubleshooting in the first place. This book will also cover tips and tricks that make the workflow easier. Style and approach An easy-to-follow guide full of interactive examples of real-world development and deployment scenarios. Ample screenshots, workflows, complementary tools, and related terminal commands are provided to address a wide range of practical and situational applications.
A Staff Guide to Addressing Disruptive and Dangerous Behavior on Campus by Brian Van Brunt,Amy Murphy Pdf
There is an increasing population of students coming to college who challenge and frustrate staff. Students struggle with complex mental health problems, environmental stress, anger difficulties, and the potential for explosively acting out with threats or violence. This practical guide provides college and university staff with direction when working with these students in a variety of college environments, including community colleges, four-year institutions, and online learning environments. Coverage includes how to identify and assess students who are at risk, calm and de-escalate a crisis, motivate and inspire change, and how to manage and maintain change in a positive direction over time. Grounded in theory and research, this book offers practical and tangible advice and guidance to make it easier to assist students in need.
Puppet Types and Providers by Dan Bode,Nan Liu Pdf
Puppet's true power exists in the simple resource model it uses to manage the state of complex operating systems. This concise guide shows you how to extend that model and implement custom functionality on top of Puppet by working with the type and provider APIs. Two experts from Puppet Labs explain the concepts behind these APIs, and provide instructions and examples to help you write your own fully functional types and providers. You'll also delve into Puppet's source code to get a better understanding of how types and providers are implemented internally. If you're familiar with basic Puppet concepts, you're ready to get started. Learn the fundamental concepts behind resources, and become familiar with the structure of Puppet's Resource Model Discover how the type API is used to create new resource types that Puppet can manage Understand how providers interact with the system to achieve the desired state of a declared resource Explore advanced features to get a more complete understanding of how Puppet works Simplify the troubleshooting process when developing types and providers
Hello Ruby: Adventures in Coding by Linda Liukas Pdf
"Hello Ruby is half picture book and half activity book rolled into one adorable package. It introduces programming without requiring a computer at all. The point of the book isn’t to teach you a programming language, but programming concepts." --GeekMom.com Meet Ruby—a small girl with a huge imagination, and the determination to solve any puzzle. As Ruby stomps around her world making new friends, including the Wise Snow Leopard, the Friendly Foxes, and the Messy Robots, kids will be introduced to the fundamentals of computational thinking, like how to break big problems into small ones, create step-by-step plans, look for patterns and think outside the box through storytelling. Then, these basic concepts at the core of coding and programming will be reinforced through fun playful exercises and activities that encourage exploration and creativity. In Ruby's world anything is possible if you put your mind to it.
Google SketchUp for Site Design illustrates a holistic approach to SketchUp: how it works and more importantly, what to do with it. Filled with tutorials from front to back, the book focuses on the start and completion of projects that include rich detail and expression. Each part and chapter of the book builds on the previous chapters and tutorial. You will learn how to approach modeling site plans, buildings and site elements: from modeling each of these exterior environment elements to piecing them together to generate a singular and expressive model. The book culminates with tutorials demonstrating effective and simple ways to include grades and terrain using the Sandbox tools and how best to integrate the entire approach with AutoCAD and SketchUp. Also included are links to supplemental on-line resources such as YouTube tutorials and free tutorial and example models from 3D Warehouse. The book is useful for all SketchUp proficiency levels including beginners, hobbyists, and professionals.
Tongues of Men and Angels by Bradley L. Pritchett Pdf
Tongues of Men and Angels is a thrilling contemporary fantasy incorporating elements of science-fiction, horror, and mystery as well. The sudden appearance of a stranger disrupts the lives of three very different individuals. Ruby Darling, a young African-American girl, is visited by an angel and subsequently gains the ability to speak in tongues and heal the sick. A graduate student nicknamed Warlock intercepts an apparent extraterrestrial transmission and sets out on a quest with his new alien lover. Miss Anne Shipley escapes Whitman Psychiatric Hospital through the aid of the magically reanimated corpse of the chief orderly. Drawn into these interconnected events, linguistics professor Adam Wren discovers that changes in the very nature of human language itself are transforming reality and that only he has any chance of stopping this.