Changing Runlevels and Boot Targets

In the previous chapter, we focused on the booting process. Afterward, the focus was switched to the various boot managers available in Linux distributions. In particular, we worked with GRUB and GRUB2, which are by far the most popular boot managers available. We looked at their respective configuration files, focusing on the timer, default boot entry, and passing arguments at the GRUB/GRUB2 boot menu. Finally, separate illustrations were created in order to add a customer boot entry in the boot menu for both GRUB and GRUB2. This chapter focuses on the introduction of runlevels and boot targets, the types of runlevels and boot targets available in the Linux distributions, and the differences between runlevels and boot targets. We will also look at working with runlevels and boot targets at the CLI.

In this chapter, we will cover the following topics:

• Introduction to runlevels
• Introduction to boot targets
• Working with runlevels
• Working with boot targets