This chapter covers the following subjects:

• The Boot Process—This section provides a high-level overview of the boot process and how it works.

• Working with GRUB—Here, you learn how to work with GRUB, the default bootloader for Red Hat.

• Runlevels—This section covers the different runlevels and how they work during the boot process.

• Service Management—This section explains how to manage system services during and after the boot process.

The following RHCSA exam objectives are covered:

• Boot, reboot, and shut down the system normally

• Boot systems into different runlevels manually

• Configure systems to boot into a specific runlevel automatically

• Use single-user mode to gain access to a system

• Start, stop, and check the status of network services

• Modify the system bootloader

• Configure network services to start automatically at boot