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Learning RHEL Networking

You're reading from   Learning RHEL Networking Gain Linux administration skills by learning new networking concepts in Red Hat Enterprise Linux 7

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Product type Paperback
Published in Jun 2015
Publisher
ISBN-13 9781785287831
Length 216 pages
Edition 1st Edition
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Toc

Table of Contents (13) Chapters Close

Preface 1. Introducing Enterprise Linux 7 FREE CHAPTER 2. Configuring Network Settings 3. Configuring Key Network Services 4. Implementing iSCSI SANs 5. Implementing btrfs 6. File Sharing with NFS 7. Implementing Windows Shares with Samba 4 8. Integrating RHEL 7 into Microsoft Active Directory Domains 9. Deploying the Apache HTTPD Server 10. Securing the System with SELinux 11. Network Security with firewalld Index

Elevating privileges

As an administrator of the RHEL server or desktop system, there will be times when root access will be required. The root user or user ID 0 is the local administrator on the system. Although it's possible to log in to the system as a root user, as with most systems, it's preferred that root access is gained as required. There are two mechanisms that can be used:

  • The substitute user or the su command
  • Using the sudo command

First, we will look at the su command.

The su command

When a user issues the su command without specifying a username, they will be prompted for the root password. If authentication is successful, they will be presented with a root shell. The following are the valid mechanisms to gain root privileges with su:

  • su -l: This presents a full login shell for root; all environment variables are set for root. The working directory of a user is changed to become the home directory of the root user, which is usually /root.
  • su: This is the same as su -l.
  • su...
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