Tutorial on how to use YUM to manage software packages in CentOS/RHEL 7 and earlier versions

We are familiar with the CentOS system and generally use YUM (Yellowdog Updater, Modified) to manage software packages. YUM is the default package manager for CentOS 7 and older versions of RHEL and Fedora. This article introduces some common YUM commands, including YUM commands to install software, update software packages, uninstall software packages, search for software packages, etc. However, it has largely been replaced by its successor Dandified YUM (also known as DNF) in most newer RPM-based distributions, including CentOS 8, RHEL 8, and Fedora 22 (and later).

Preparation before starting

1. Prepare a CentOS/RHEL 7 system

Systems running on CentOS/RHEL 7, Fedora 21, or any earlier distribution. Other Linux distributions that use the APT package manager can also be used. If there is no compatible system yet, you can reinstall the system.

2. Connect to Banwagonhost SSH

Secondly, we need to connect to the Banwagonhost VPS via SSH before we can perform a series of operations.

Use YUM to upgrade packages

1. Update installed software packages

sudo yum update

2. List installed software packages that can be updated

sudo yum list updates

3. Update specific software packages (taking Apache as an example)

sudo yum update httpd

Use YUM to install packages

1. Install the software package (taking PHP as an example)

sudo yum install php

2. Reinstall the software package

sudo yum reinstall php

Use YUM to uninstall packages

1. Uninstall the software package (taking MariaDB as an example)

sudo yum remove mariadb-server

2. Delete a package and all dependent packages installed with it

sudo yum autoremove mariadb-server

3. Use the autoremove command without specifying a package to identify and delete system dependencies that are no longer needed

sudo yum autoremove

Some useful YUM options

1. Install multiple software packages at the same time (the following commands install Apache, PHP and MariaDB in a single command)

sudo yum install httpd php mariadb-server

2. To specify a specific version of the software package, please add – and the required version number after the package name

sudo yum install neovim-0.3.8

To list the available versions of a package, use the –showdupicates option with the list command and the name of a specific package:

sudo yum list neovim --showduplicates

3. Automatically confirm, use -y or –assumeyes option

sudo yum install neovim -y

Find and search packages

1. List all packages in the YUM repository

sudo yum list

List all packages that can be installed on the system via YUM's repository:

sudo yum list available

List all packages currently installed on the system:

sudo yum list installed

List packages added to the YUM repository in the past week:

sudo yum list recent

2. Search for available YUM packages (take git as an example)

sudo yum search git

Search multiple keywords:

sudo yum search version control

3. Search for packages based on commands (such as finding packages containing the pip3 command)

sudo yum provides pip3

4. Get other detailed information about the package

sudo yum info python36

5. Get the dependency list of a given package

sudo yum deplist python36

Add YUM repository method

Like other Linux package managers, YUM allows adding repositories in addition to the default repositories. The following mainly introduces how to add Extra Packages for Enterprise Linux (EPEL).

1. Install EPEL repository

sudo yum install epel-release

2. Verify that the EPEL repository is in use

sudo yum repolist

3. Once the repository is added, you can install packages from it just like you would from the default repository. This example installs Nagios, which is available in the EPEL repository but not in YUM's default repository

sudo yum install nagios

Get more help using YUM

You can use the -h or –help command to get more help information.

sudo yum help

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