Skip to content

Contact sales

By filling out this form and clicking submit, you acknowledge our privacy policy.
  • Labs icon Lab
  • A Cloud Guru
Google Cloud Platform icon
Labs

Maintaining Linux Systems

In this lab, we are going to practice scheduling updates, modifying NTP settings, and changing what kernel the server will reboot into. Understanding how to do these tasks will prepare you for various administrative duties in the future. *This course is not approved or sponsored by Red Hat.*

Try for free Contact sales
Google Cloud Platform icon
Labs

Path Info

Level
Clock icon Intermediate
Duration
Clock icon 30m
Published
Clock icon Apr 05, 2019

Contact sales

By filling out this form and clicking submit, you acknowledge our privacy policy.

Table of Contents

  1. Challenge

    Schedule a Job Using the `at` Utility

    To schedule commands using the at command, you can run

    at 12:00am

    at> yum update -y

    Pressing Ctrl+D will show a message, then send you back to the shell.

    at> <EOT>

    You can run atq to verify that the command is scheduled.

    If you get an error similar to: Can't open /var/run/atd.pid to signal atd. No atd running?

    That means that the atd service isn't running. You can resolve that by running

    systemctl start atd

  2. Challenge

    Modify the NTP Pools to Keep Clocks Synchronized

    NTP configuration is set in /etc/chrony.conf.

    The lines that need to be modified are at the top of the file. Edit them to look like:

    server 0.pool.ntp.org iburst

    server 1.pool.ntp.org

    server 2.pool.ntp.org

    server 3.pool.ntp.org

  3. Challenge

    Modify GRUB to Boot a Different Kernel

    List the currently installed kernels with grubby --info=ALL

    Find the line that looks like

    index=1

    You'll see information about that kernel following the index.

    Run grubby --set-default-index=<index number>

    Run grubby --default-index to verify it worked.

A Cloud Guru - Labs - Maintaining Linux Systems
Author
A Cloud Guru

The Cloud Content team comprises subject matter experts hyper focused on services offered by the leading cloud vendors (AWS, GCP, and Azure), as well as cloud-related technologies such as Linux and DevOps. The team is thrilled to share their knowledge to help you build modern tech solutions from the ground up, secure and optimize your environments, and so much more!

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.

Start learning by doing today

View Plans