A Practical Guide to Fedora™ and Red Hat® Enterprise Linux®

11. System Administration: Core Concepts

In This Chapter

Running Commands with root Privileges 409

Using su to Gain root Privileges 413

Using sudo to Gain root Privileges 415

The systemd init Daemon (Fedora) 426

The Upstart init Daemon (RHEL) 436

SysVinit (rc) Scripts: Start and Stop System Services (Fedora/RHEL) 442

Single-User Mode 449

SELinux 459

Setting Up a chroot Jail 485

DHCP: Configures Network Interfaces 489

nsswitch.conf: Which Service to Look at First 494

Objectives

After reading this chapter you should be able to:

• Explain the need for and the responsibility of the privileged user (root)

• Gain privilege using su and sudo

• Describe the startup sequence using systemd (Fedora) and Upstart (RHEL)

• Explain the history and current ...