Rai Vishal - Expert Linux Administration Guide

My beloved Parents:

Late S.N Rai Sharma

Smita Kusum Rai

&

My wife Dr. Jyoti Rai and My Son Ivan Rai , Rudransh Rai & my brother Mr. Monaswi Rai

Vishal Rai has done B.Sc. (Maths), Masters in Mathematics, A-Level, M.C.A., and a number of certifications related to database and networking and Cyber Law. He has worked as a Jr.Consultant/Sr. System Administrator in Govt./Private organization and a total of 10+ years of experience in various domains like Mathematics, Database, Networking, Cyber Security and Virtualization etc. Deployed the Lab for Cyber Security Training using Virtualization. He has trained the Govt. Employee of various organizations related to cyber security.

Dr. Ashwini Kumar Srivastava received his M.Sc in Mathematics from D.D.U. Gorakhpur University, MCA(Hons.) from U.P. Technical University, M.Phil. in Computer Science from Allagappa University Karaikudi and Ph.D. in Computer Science from D.D.U. Gorakhpur University, Gorakhpur. Currently working as Assistant Professor & Head in Department of Computer Application, Shivharsh Kisan P.G. College, Basti, U.P.

He has seventeen years of teaching and thirteen years research experience in the scenario of Computer Science & Application. His areas of interest include Software Reliability, Artificial Neural Networks, Bayesian methodology, Data Warehousing, Cybercrime and operating system.

About more than 25 of his research papers and articles have been published in reputed refereed national and international journals and in edited books and also published two books in reputed publications.

Dr. Ashwinis academic activities include presentation of many papers in national and international seminars. He is a member of the Editorial/Advisory Board of some International Journals. He is a well acknowledged resource person in computer education. He has delivered many more invited expert lectures in various organizations like colleges, institutes and industries in the area of his specialization.

Gouri Amrita is a person with loads of enthusiasm and passion. Worked as a senior technical consultant with a corporate and presently working as a technical corporate trainer. Worked extensively with Active Directory Services, Mail Server configurations, Virtualization, Web Server, Firewall, Windows Server Administrations, Powershell and Shell Scripting, Networking and Red Hat Linux Administrations. 12+ years of experience started as a lecturer in an Engg College and moved forward with technical upskilling to corporate world, delivered training to various IT companies pan India. Recently added skills are in the area of cyber defense. A kind of perfectionist who takes pain to properly test codes and configurations along with the documentation process.

Possess mature thought process to create training material relevant to the audience. With natural ease in dealing with people and ability to transfer knowledge leaves a lasting impact in learning forums. In addition to technology, other areas of interest are spiritual upliftment, enhancement of core human values to bring out the best possible in a person which in turn add joy and ease at work and society. Do lots of reading, practice and communication in this field.

There are a few people I want to thank for the continued and ongoing support they have given me during the writing of this book. First and foremost, I would like to thank my parents for continuously encouraging me for writing the book I could have never completed this book without their support.

I am grateful to the course and the companies which gave me support throughout the learning process of web scraping and very important to learn the tools related to web scraping.

Thank you for the all hidden support provided. I gratefully acknowledged Mrs. Gouri Amirta for his kind technical scrutiny for this book.

My gratitude also goes to the team at BPB Publications for being supportive enough to provide me quite a long time to finish the first part of the book and also allow me to publish the book in multiple parts, since image processing, being a vast and very active area of research, it was impossible to deep-dive into different class of problems in a single book, especially by not making it too voluminous.

One of the major benefits of Linux operating system is in its availability in open source platform and also majority of its vast features like the desktops, UNIX compatibility; network servers; and numerous software applications such as office, multimedia, and Internet applications. GNOME and the K Desktop Environment (KDE) are commonly available in most of the Linux distributions. Linux is also considered as a fully functional UNIX operating system. It has all the standard features of a powerful UNIX system, including a complete set of UNIX shells such as BASH, TCSH, and the Z shell. Those familiar with the UNIX interface can use any of these shells, with the same UNIX commands, filters, and configuration features. UNIX has found its usage in variety of fields hence in order to facilitate the user with the basic theme, this book primarily focuses on configuration & installation of different types of typical servers such as DNS, DHCP, FTP, SAMBA, Squid etc. with detailed explanations. This book also covers the numerous troubleshooting tips and ready to use the solution which can also be helpful to System Manager/System Administrator/ Technical Assistant for quickly resolving the most commonly occurring problems. This book also provides you the some of the critical aspect of how to configure the hardware and design a hard disk layout related to production environment.