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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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Path Info

Level
Clock icon Intermediate
Duration
Clock icon 30m
Last updated
Clock icon Aug 31, 2025

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Table of Contents

  1. 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

  2. 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

  3. 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

  4. 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

  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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