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Working with Kernel Modules

The Linux system provides a framework for loadable modules which can add or remove certain functionality without the need for a restart. In this lab, you will be tasked with installing and removing kernel modules, as well as displaying additional information about them.

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Labs

Path Info

Level
Clock icon Intermediate
Duration
Clock icon 30m
Published
Clock icon Apr 10, 2020

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Table of Contents

  1. Challenge

    Get a Count of the Current Installed Modules and Save It to /root/current_count.txt

    Display all the loaded modules:

    lsmod

    Save the count of all the loaded modules to /root/current_count.txt:

    lsmod | wc -l > /root/current_count.txt

  2. Challenge

    Remove the target_core_mod Module and All Its Dependencies

    To remove the target_core_module, the iscsi_target_mod dependency must be removed (the -v option can be used to display additional information):

    modprobe -r iscsi_target_mod

    Validate the modules have been removed:

    lsmod | grep target

  3. Challenge

    Install the nfsd Module

    Install the nfsd module using the modprobe command (the -v option can be used to display additional information):

    modprobe -v nfsd

    Validate that the module was loaded:

    lsmod | grep nfsd

  4. Challenge

    Display the Dependencies for the nfsd Module and Save the Names to /root/dependencies.txt

    Display information for the nfsd module:

    modinfo nsfd

    Save the names of the dependencies to /root/dependencies.txt:

    modinfo nfsd | grep depends > /root/dependencies.txt

  5. Challenge

    Get a Final Count of the Modules and Save It to /root/updated_count.txt

    Add the output from lsmod | wc -l to the /root/updated_count.txt file:

    lsmod | wc -l > /root/updated_count.txt

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