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

Keeping YUM clean and tidy


In this recipe, we will investigate the role of YUM with regard to ensuring that the working cache remains current. As a part of its typical mode of operation, YUM will create a cache that consists of metadata and packages. These files are very useful, but over time, they will accumulate in size to such an extent that you may find that YUM is acting erratically or not as intended. The frequency of this happening can vary from system to system, but it generally implies that the YUM cache system requires your immediate attention. Such a situation can be quite frustrating, but it is the purpose of this recipe to provide a quick solution that will serve to assist you in cleaning the cache and restoring YUM to its original working state.

Getting ready

To complete this recipe, you will require a working 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 facilitate...