Book Image

CentOS 7 Linux Server Cookbook - Second Edition

By : Jonathan Hobson
Book Image

CentOS 7 Linux Server Cookbook - Second Edition

By: Jonathan Hobson

Overview of this book

This book will provide you with a comprehensive series of starting points that will give you direct access to the inner workings of the latest CentOS version 7 and help you trim the learning curve to master your server. You will begin with the installation and basic configuration of CentOS 7, followed by learning how to manage your system, services and software packages. You will then gain an understanding of how to administer the file system, secure access to your server and configure various resource sharing services such as file, printer and DHCP servers across your network. Further on, we cover advanced topics such as FTP services, building your own DNS server, running database servers, and providing mail and web services. Finally, you will get a deep understanding of SELinux and you will learn how to work with Docker operating-system virtualization and how to monitor your IT infrastructure with Nagios. By the end of this book, you will have a fair understanding of all the aspects of configuring, implementing and administering CentOS 7 Linux server and how to put it in control.
Table of Contents (22 chapters)
CentOS 7 Linux Server Cookbook Second Edition
Credits
About the Authors
About the Reviewer
www.PacktPub.com
Preface
Index

Creating a virtual block device


In this recipe, we will create a virtual block device that we will use to simulate real devices and partitions so that we can test-drive concepts and commands used in all later recipes in this chapter. Working with real disks and partitions often involves the risk of losing important data or even having to re-install your complete system. A virtual block device is ideal to learn the techniques and try things out before switching to "production mode". Later, if you have gained enough experience and feel safe, you can easily replace it with "real" hardware devices, partitions, and logical volumes (which is a part of LVM; see the later recipe). All you need to do is substitute your virtual device with "real" block device names.

Getting ready

To complete this recipe, you will require a minimal installation of the CentOS 7 operating system with root access. To create a virtual block device, you should have at least one gigabyte of free hard disk space that we will...