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Pierluigi Riti - Beginning HCL Programming Using Hashicorp Language for Automation and Configuration

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Pierluigi Riti Beginning HCL Programming Using Hashicorp Language for Automation and Configuration
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Book cover of Beginning HCL Programming Pierluigi Riti and David Flynn - photo 1
Book cover of Beginning HCL Programming
Pierluigi Riti and David Flynn
Beginning HCL Programming
Using Hashicorp Language for Automation and Configuration
1st ed.
Logo of the publisher Pierluigi Riti Mullingar Ireland David Flynn New - photo 2
Logo of the publisher
Pierluigi Riti
Mullingar, Ireland
David Flynn
New Orleans, LA, USA

Any source code or other supplementary material referenced by the author in this book is available to readers on GitHub via the books product page, located at www.apress.com/9781484266335 . For more detailed information, please visit www.apress.com/source-code .

ISBN 978-1-4842-6633-5 e-ISBN 978-1-4842-6634-2
https://doi.org/10.1007/978-1-4842-6634-2
Pierluigi Riti and David Flynn 2021
This work is subject to copyright. All rights are reserved by the Publisher, whether the whole or part of the material is concerned, specifically the rights of translation, reprinting, reuse of illustrations, recitation, broadcasting, reproduction on microfilms or in any other physical way, and transmission or information storage and retrieval, electronic adaptation, computer software, or by similar or dissimilar methodology now known or hereafter developed.
The use of general descriptive names, registered names, trademarks, service marks, etc. in this publication does not imply, even in the absence of a specific statement, that such names are exempt from the relevant protective laws and regulations and therefore free for general use.
The publisher, the authors and the editors are safe to assume that the advice and information in this book are believed to be true and accurate at the date of publication. Neither the publisher nor the authors or the editors give a warranty, expressed or implied, with respect to the material contained herein or for any errors or omissions that may have been made. The publisher remains neutral with regard to jurisdictional claims in published maps and institutional affiliations.
Distributed to the book trade worldwide by Apress Media, LLC, 1 New York Plaza, New York, NY 10004, U.S.A. Phone 1-800-SPRINGER, fax (201) 348-4505, e-mail orders-ny@springer-sbm.com, or visit www.springeronline.com. Apress Media, LLC is a California LLC and the sole member (owner) is Springer Science + Business Media Finance Inc (SSBM Finance Inc). SSBM Finance Inc is a Delaware corporation.

To my family

Pierluigi Riti

I would obviously like to dedicate this book to Pier. I would also like to mention all the pioneers around the world who have, are, and will hopefully continue to develop, research, and explore these new technologies in order to bring exciting new avenues for technological advancement. A further mention to all those at Mastercard and previous companies who have developed my knowledge to allow such endeavors as this.

David Flynn

Introduction

HashiCorp offers a full range of products to improve the life of every DevOps engineer. Our goal with this book is to introduce various software applications and show how to use the HCL language to configure them. This book is not meant to be an exhaustive guide to all possible scenarios, but to introduce the software options and how to use them together to create a complete Infrastructure as Code. To get the most out of this book, you should have a basic knowledge of Bash PowerShell scripting and a basic knowledge of programming in general.

Table of Contents
About the Authors
Pierluigi Riti

is a Lead Security Information Engineer and DevOps fanatic he actually work in MasterCard. He has worked for company like, Coupa Software, and Synchronoss Technologies. Prior to that, he was a senior software engineer at Ericsson and Tata. His experience includes implementing DevOps in the cloud using Google Cloud Platform, AWS, and Azure. Also, he has over 20 years of extensive experience in more general design and development of different scale applications particularly in the telco and financial industries. He has quality development skills using the latest technologies including Java, J2EE, C#, F#, .NET, Spring .NET, EF, WPF, WF, WinForm, WebAPI, MVC, Nunit, Scala, Spring, JSP, EJB, Struts, Struts2, SOAP, REST, C, C++, Hibernate, NHibernate, WebLogic, XML, XSLT, Unix script, Ruby, and Python.

David Flynn

is an Associate Analyst in Employee Access Business Operations at MasterCard. He is an electronic engineer with experience in telecommunications, networks, software, security, and financial systems. David started out as a telecommunications engineer working on voice, data, and wireless systems for Energis and later Nortel Networks, supporting systems such as Lucent G3r, Alcatel E10, and Nortel Passport. He then did some time in transport and private security abroad before retraining in computing, cyber security, and cloud systems plus doing cyber security and telecomm research for the Civil Service. He has completed separate diplomas in computing and cloud focusing on Windows, C#, Google, AWS, and PowerShell among other technologies. David has also worked as a C# engineer. More recently, David has worked for various fintech companies including Bank of America and Merrill Lynch, focusing on technical and application support encompassing such technologies as Rsa Igl, Rsa SecurID, IBM Tam/Isam, Postgres/Oracle databases, mainframes, Tandem, CyberArk, MaxPro, and Active Directory.

Pierluigi Riti and David Flynn 2021
P. Riti, D. Flynn Beginning HCL Programming https://doi.org/10.1007/978-1-4842-6634-2_1
1. Introduction to HCL
Pierluigi Riti
(1)
Mullingar, Ireland
(2)
New Orleans, LA, USA

HashiCorp is a significant player in the cloud revolution. The company produces most of the essential tools for any DevOps engineer or cloud engineer.

The HashiCorp ecosystem is quite huge; the aim of this book is to introduce the configuration language and the different HashiCorp software components.

HCL, A Brief Introduction

HCL is a configuration language designed to be both human- and machine-readable. HCL is an automation language that is used to manage, create, and release Infrastructure as Code. Based on a study conducted on the GitHub repository, HCL was the third highest in terms of language growth popularity in 2019, which indicates how important the HCL platform has become, which in turn was probably aided by HashiCorp applications like Terraform, Consul, and Vault.

HCL is designed to ease the maintenance of cloud and multi-cloud hybrid solutions. The language is structural, with the goal of being easily understood by humans and machines.

HCL is fully JSON-compatible and the language is intended to be used to build DevOps tools and servers, manage PKI passwords, and release Docker images. HCL gets its inspiration from libucl, the Nginx configuration, and other configuration languages.

libucl, the Universal Configuration Library Parser, is the main inspiration for the HCL language. As you will see, HCL uses a similar structure, and UCL is heavy inspired by Nginx configuration.

When HCL was designed, the choice was made to mix together the power of a general-purpose language like Ruby, Python, or Java with the simplicity and human readability of JSON. HashiCorp designed its own DSL language.

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