Linux

How to use the DNF Package Manager in REHL Systems

This guide aims to familiarize you with the DNF commands you are most likely to encounter while working with your CentOS 8 or Fedora server. By the end, you should feel comfortable navigating all but the more advanced features DNF offers.
Captain Salem 5 min read
How to use the DNF Package Manager in REHL Systems

Dandified YUM, or simply DNF, is the successor to the popular Yellowdog Updater, Modified package manager, more commonly known as YUM.

Both DNF and YUM provide a user-friendly interface to the RPM Package Manager (RPM) that comes with CentOS, RHEL, Fedora, and many other Linux distributions.

As the successor to YUM, DNF has several enhancements including increased performance, faster dependency resolution, and more complete documentation for its API.

DNF has replaced YUM as the default package manager on most newer RPM-based distributions, including:

  • RHEL (Red Hat Enterprise Linux) 8
  • CentOS 8 and other RHEL derivatives (such as AlmaLinux 8 and Rocky Linux 8)
  • Fedora 22 (and later)

While the YUM package manager is no longer used on these distributions, the yum command still works in many cases.

Most distributions link the yum command to the DNF software and, since DNF maintains compatibility with much of YUM's CLI, most commands still function as intended. This is why some documentation for these distributions still reference the yum command to install or update software.

You can also find a few helpful resources at the end of this guide.

Before You Begin

Before running the commands within this guide, you will need:

A system running on CentOS/RHEL 8, AlmaLinux 8, Rocky Linux 8, Fedora 22, or later versions of these distributions. Other Linux distributions that employ the DNF package manager can also be used.

Login credentials to the system

Upgrade Packages

Use the following command to upgrade your installed packages to their latest versions:

sudo dnf upgrade

It is usually a good idea to run this command before you begin a new installation to ensure your existing packages are up to date. You are likely to see this command at the beginning of many installation guides and wherever DNF is used.

You can list the installed packages for which updates are available. This command also lists any installed packages that are becoming obsolete.

sudo dnf check-update

To upgrade a specific package, use the following command.

sudo dnf upgrade <package-name>

The following example upgrades the Apache package.

 sudo dnf upgrade httpd

Install Packages

You can install a package using the following command. This example installs the Nginx server

sudo dnf install nginx

You can reinstall a package using the following command:

sudo dnf reinstall nginx

Uninstall Packages

Use the following command to uninstall a package. This example uninstalls the MySQL Server

sudo dnf remove mysql-server

To remove a package and all of the dependency packages that were installed alongside it, use the following command.

sudo dnf autoremove mysql-server

Using the autoremove command without specifying a package identifies and removes any packages originally installed as dependencies but which are no longer needed.

sudo dnf autoremove

DNF also provides an option to remove duplicate packages. The following command removes any older versions installed and reinstalls the newest version.

sudo dnf remove --duplicates

Useful Options

DNF provides numerous options in common between many of its commands. The examples below show the most commonly used of these options.

You can provide a list of packages, separated by spaces, where you would normally provide the package name. For instance, the following install Nginx, PHP, and MySQL Server in a single command:

sudo dnf install nginx php mysql-server

To use a specific version of a package, follow the package name with - and the desired version number. This works with any of the commands where you designate a package name. This example installs version 9.0 of the *Vim text editor:

sudo dnf intall vim-9.0.0

To identify the available versions of a package, use the --showdupicates option with the list command and the specific package's name.

sudo dnf list neovim --showduplicates

Use the -y, or --assumeyes, flag to automatically answer Yes to all prompts DNF would otherwise present. The following example installs NeoVim without prompting the user to confirm any steps in the installation process, such as when it needs to install dependencies.

sudo dnf install neovim -y

To list all packages in DNF's repositories, you can use DNF's list command. But, this gives you a massive list of all packages.

You can use the following options that give you a useful list of a specific group of packages.

The installed option lists all of the packages currently installed on your system.

sudo dnf list installed

The recent option lists packages added to the DNF repositories in the past week.

sudo dnf list recent

You can also give the name of a package along with the --showduplicates flag. This gives a list of available versions of the package. You can see a version of this command used in the Useful Options section above. The example below shows all of the versions of Git available in DNF's repositories:

sudo dnf list git --showduplicates

You can search DNF's available packages using the following command. Here, the command finds packages that have the term git in their metadata.

sudo dnf search git

The search command supports multiple arguments separated by spaces. You can use this to search for multiple keywords.

sudo dnf search version control

If you want to find a package based on a specific command it provides, you can use a command like the following. This example finds packages that provide a jupyter-notebook command.

sudo dnf provides jupyter-notebook

In this case, the search comes up with the python3-notebook package.

You can also get additional details about a package. For example, the python3-notebook package was found in the previous example.

sudo dnf info python3-notebook

Automate Package Updates

DNF has a supplemental package, DNF Automatic, which allows you to configure an automated process for updating packages. These steps show you how to install and get started using DNF Automatic.

Install the DNF Automatic package.

sudo dnf install dnf-automatic

Using your preferred text editor, open the DNF Automatic configuration file which is located at: /etc/dnf/automatic.conf. Here, enter your configuration preferences.

The following presents example values for some configuration options. It is recommended that you change these values.

[commands]
upgrade_type=default
download_update=yes
apply_updates=yes
emit_via=motd

You can switch upgrade_type to security if you want to limit the updates made to only those impacting system security. With emit_via set to motd, DNF Automatic's reports will be stored in the /etc/motd file.

You can start the DNF Automatic timer by running the following command:

sudo systemctl enable --now dnf-automatic.timer

You can verify that the timer has been created with the following command:

sudo systemctl list-timers dnf-*

Conclusion

With the information in this guide, you should be armed for the majority of cases in which you are likely to use DNF on your Fedora webserver. If you come to a situation where you need to use DNF's more advanced features, you can explore DNF with the -h, or --help, flag.

sudo dnf -h

For more information on a specific DNF command and a list of the command's options, follow the command with the -h flag. This example gets information on the autoremove command:

sudo dnf autoremove -h

Stay tuned for DNF Command Cheat Sheet coming up soon!!

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