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

Working with SELinux security contexts


As we have learned from the previous recipe in this chapter, SELinux is all about labels and policies. In this recipe, we will show you how to work with these labels, also known as security contexts.

Getting ready

To complete this recipe, you will require a working installation of the CentOS 7 operating system with root privileges. It is assumed that you are working through this chapter recipe by recipe, so by now you should have installed the SELinux tools from the previous recipe and generated all the SELinux man pages for the policies. As you may notice, some of the commands that we will show you in this recipe have already been applied in other recipes in this book. We will explain them here in detail. For using the netstat program, install the package, net-tools, with the YUM package manager.

How to do it...

As we have learned in a previous recipe, almost every component in a SELinux system is an object (files, directories, processes, users, and so...