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

Locking down remote access and hardening SSH


In this recipe, we will learn how to provide additional security measures in order to harden the secure shell environment. The Secure Shell (SSH) is the basic toolkit that provides remote access to your server. The actual distance to the remote machine is negligible, but the shell environment enables you to perform maintenance, upgrades, the installation of packages and file transfers; you can also facilitate whatever action you need to carry out as the administrator in a secure environment. It is an important tool; as the gateway to your system, it is the purpose of this recipe to show you how to perform a few rudimentary configuration changes that will serve to protect your server from unwanted guests.

Getting ready

To complete this recipe, you will require a minimal installation of the CentOS 7 operating system with root privileges, a console-based text editor of your choice, and a connection to the Internet in order to download additional packages...