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Implementing System Security on Linux

Implementing security best practices is a necessary skill for a system administrator. In this hands-on lab, you will be tasked with securing a Linux host in a wide array of areas.

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Path Info

Level
Clock icon Intermediate
Duration
Clock icon 30m
Last updated
Clock icon Sep 02, 2025

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Table of Contents

  1. Challenge

    Update the System Software

    • Use the package manager to update all software packages (depending on the state of the lab image, packages may already be updated).

  2. Challenge

    Limit the Services on the Host to Only the Apache HTTP Server

    • Stop and disable the postfix service.
    • Remove the postfix package.

  3. Challenge

    Set Up a Local Firewall

    • Start and enable the firewalld service.
    • Allow the https service through the firewall.

  4. Challenge

    Implement File-Level Security and Detection

    • Set SELinux to enforcing mode.
    • Install the the aide utility.

  5. Challenge

    Create a Remote Backup of Important Data on the Host

    • Generate a public and private key on server01. This should use the default location for storing the keys, and a password should be provided.
    • Share the public key with the backup server (server02).
    • Use the rsync command to back up the contents of the /opt/data directory to the /home/cloud_user/data directory on server02.
Pluralsight Skills - Labs - Pluralsight
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Pluralsight Skills

Pluralsight Skills gives leaders confidence they have the skills needed to execute technology strategy. Technology teams can benchmark expertise across roles, speed up release cycles and build reliable, secure products. By leveraging our expert content, skill assessments and one-of-a-kind analytics, keep up with the pace of change, put the right people on the right projects and boost productivity. It's the most effective path to developing tech skills at scale.

What's a lab?

Hands-on Labs are real environments created by industry experts to help you learn. These environments help you gain knowledge and experience, practice without compromising your system, test without risk, destroy without fear, and let you learn from your mistakes. Hands-on Labs: practice your skills before delivering in the real world.

Provided environment for hands-on practice

We will provide the credentials and environment necessary for you to practice right within your browser.

Guided walkthrough

Follow along with the author’s guided walkthrough and build something new in your provided environment!

Did you know?

On average, you retain 75% more of your learning if you get time for practice.
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