Change Runlevels and Shutdown or Reboot System

Introduction

The Change Runlevels and Shutdown or Reboot System module provides you with the instructions and devices to develop your hands on skills in the following topics:

• Configure a runlevel
• Switch among runlevels
• Shutdown and reboot the system from the command line
• Alert users before switching runlevels or other major system events
• Understand terms and utilities

Lab time: It will take approximately 1 hour to complete this lab.

Exercise 1 - Change Runlevels and Shutdown or Reboot System

A run level on a Linux system is the definition of what all services are running on the system. To run each service, relevant parameters need to be initialised in the init file. Therefore, each level defines the state of various parameters in the init file. Each run levels is referred to by a number. You can change between run levels to activate or shutdown various services, as required.

In this exercise, you will understand how to change runlevels to shutdown or reboot systems.