Modifying Runlevels on Linux

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Modifying Runlevels on Linux

A runlevel is a specific mode of operation used by systems that implement System V initialization. In this lab, we are tasked with modifying runlevels for both CentOS and Ubuntu.

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Lab Info

Level

Intermediate

Last updated

Sep 21, 2025

Duration

30m

Challenge

Configure the Runlevels on the CentOS Server
1. Use the chkconfig command to disable the crond service for runlevels 2 and 4:
  
  chkconfig --level 24 crond off
2. Use the chkconfig to enable the httpd service for runlevels 3 and 5:
  
  chkconfig --level 35 httpd on
Challenge

Modify the Initialization Script for the Postfix Service on the CentOS Server
1. Use a text editor to modify the init script for postfix at /etc/rc.d/init.d/postfix with the following changes:
2. Update this line:
  
  # chkconfig: 2345 80 30
  
  To be:
  
  # chkconfig: 3 78 35
3. Update this line:
  
  # Default-Start: 2 3 4 5
  
  To be:
  
  # Default-Start: 3
4. Apply the changes.
5. Remove the postfix service:
  
  chkconfig --del postfix
6. Add the postfix service:
  
  chkconfig --add postfix
Challenge

Remove the SysVinit Script Links for the Nginx Service on the Ubuntu server
1. Use the update-rc.d command to remove init links for nginx:
  
  update-rc.d nginx remove
Challenge

Enable the Lighttpd Service for Runlevels 2 and 5 on the Ubuntu server
1. Use the update-rc.d command to enable lighttpd for runlevels 2 and 5:
  
  update-rc.d lighttpd enable 2 5
Challenge

Create the Default SysVinit links for the Bluetooth Service on the Ubuntu server
1. Use the update-rc.d command to add the defaults for the Bluetooth service:
  
  update-rc.d bluetooth defaults

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