Book Image

Mastering CentOS 7 Linux Server

By : Mohamed Alibi, BHASKARJYOTI ROY
Book Image

Mastering CentOS 7 Linux Server

By: Mohamed Alibi, BHASKARJYOTI ROY

Overview of this book

Most server infrastructures are equipped with at least one Linux server that provides many essential services, both for a user's demands and for the infrastructure itself. Setting up a sustainable Linux server is one of the most demanding tasks for a system administrator to perform. However, learning multiple, new technologies to meet all of their needs is time-consuming. CentOS 7 is the brand new version of the CentOS Linux system under the RPM (Red Hat) family. It is one of the most widely-used operating systems, being the choice of many organizations across the world. With the help of this book, you will explore the best practices and administration tools of CentOS 7 Linux server along with implementing some of the most common Linux services. We start by explaining the initial steps you need to carry out after installing CentOS 7 by briefly explaining the concepts related to users, groups, and right management, along with some basic system security measures. Next, you will be introduced to the most commonly used services and shown in detail how to implement and deploy them so they can be used by internal or external users. Soon enough, you will be shown how to monitor the server. We will then move on to master the virtualization and cloud computing techniques. Finally, the book wraps up by explaining configuration management and some security tweaks. All these topics and more are covered in this comprehensive guide, which briefly demonstrates the latest changes to all of the services and tools with the recent shift from CentOS 6 to CentOS 7.
Table of Contents (16 chapters)
Mastering CentOS 7 Linux Server
Credits
About the Authors
About the Reviewers
www.PacktPub.com
Preface
Index

Setting up a mail tool (Dovecot) to retrieve mails


As we have said earlier, Dovecot is an open source IMAP and POP3 server. It is fast, easy to set up and configure, and it uses very little RAM memory. For this section, we are going to install it to work with Postfix as MDA (POP/IMAP service) and sieve for sorting mail at the mail server POP/IMAP service. As this image shows, Dovocot is positioned between the user mailbox and Postfix:

Since we have already installed Dovecot, we now only need to configure it to work alongside Postfix. If we ever miss the installation, we can always use the yum package manager to reinstall it:

$ sudo yum install dovecot

Then, we need to add Dovecot support to the Postfix configuration file. Again, we will not go and edit the file; we will only use the command postconf -e. First, we need to enable Dovecot to use the SMTP and enable the service authentication:

$ sudo postconf -e 'smtpd_sasl_type = dovecot'
$ sudo postconf -e 'smtpd_sasl_path = private/auth...