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 Postfix


In a previous recipe, we learned how to install and configure Postfix as our domain-wide e-mail server. When it comes to working with e-mails, there are lots of different tools and programs available for Linux and we already showed you how to send e-mails through the sendmail program as well as the swaks utility. Here in this recipe, we will show you how to work with one of the most commonly used mail utilities in Unix and Linux, called mailx, which has some useful features missing in the sendmail package for sending mails or reading your mailbox.

How to do it...

We will begin this recipe by installing the mailx package on our server running our domain-wide Postfix service, as it is not available on CentOS 7 by default.

  1. Begin by logging in as root and typing the following command:

    yum install mailx
    
  2. The easiest way is to use mailx with its standard input mode, as follows:

    echo "this is the mail body." | mail -s "subject" [email protected]
    
  3. You can also send mails from a text...