How to Set Up a Local Yum/DNF Repository on CentOS 8

In this article, you will learn how you can locally set up a DNF or YUM repository on your CentOS 8 system using an ISO or an installation DVD.

CentOS 8 ships with 2 repositories: BaseOS and AppStream (Application Stream) – So what’s the difference between the two repositories?

The BaseOS repository consists of the requisite packages required for the existence of a minimal operating system. On the other hand, AppStream comprises the remaining software packages, dependencies, and databases.

Related Read: How to Create Local HTTP Yum/DNF Repository on RHEL 8

Now let’s roll up our sleeves and set up a local YUM/DNF repository in CentOS 8.

Step 1: Mount CentOS 8 DVD Installation ISO File

Begin by mounting the ISO file to a directory of your choice. Here, we have mounted in on /opt directory.

# mount CentOS-8-x86_64-1905-dvd1.iso /opt
# cd /opt
# ls
Mount CentOS 8 ISO File

Mount CentOS 8 ISO File

Step 2: Create a CentOS 8 Local Yum Repository

In the mounted directory where your ISO is mounted, copy the media.repo file to the /etc/yum.repos.d/ directory as shown.

# cp -v /opt/media.repo  /etc/yum.repos.d/centos8.repo
Create CentOS 8 Local Yum Repository

Create CentOS 8 Local Yum Repository

Next, assign file permissions as shown to prevent modification or alteration by other users.

# chmod 644 /etc/yum.repos.d/centos8.repo
# ls -l /etc/yum.repos.d/centos8.repo
Set Permission On Yum Repository File

Set Permission On Yum Repository File

We need to configure the default repository file residing on the system. To check the configurations, use the cat command as shown.

# cat etc/yum.repos.d/centos8.repo
Check Yum Repository File

Check Yum Repository File

We need to modify the configuration lines using a text editor of your choice.

# vim etc/yum.repos.d/centos8.repo

Delete all the configuration, and copy & paste the configuration below.

[InstallMedia-BaseOS]
name=CentOS Linux 8 - BaseOS
metadata_expire=-1
gpgcheck=1
enabled=1
baseurl=file:///opt/BaseOS/
gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-centosofficial

[InstallMedia-AppStream]
name=CentOS Linux 8 - AppStream
metadata_expire=-1
gpgcheck=1
enabled=1
baseurl=file:///opt/AppStream/
gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-centosofficial

Save the repo file and exit the editor.

After modifying the repository file with new entries, proceed and clear the DNF / YUM cache as shown.

# dnf clean all
OR
# yum clean all

To confirm that the system will get packages from the locally defined repositories, run the command:

# dnf repolist
OR
# yum repolist
List Yum Repositories

List Yum Repositories

Now set ‘enabled’ parameter from 1 to 0 in CentOS-AppStream.repo and CentOS-Base.repo files.

Step 3: Install Packages Using Local DNF or Yum Repository

Now, let’s give it a try and install any package. In this example, we are going to install NodeJS on the system.

# dnf install nodejs
OR
# yum install nodejs
Install Packages from Local Yum Repository

Install Packages from Local Yum Repository

And this is a clear indicator that we have successfully set up a local DNF/YUM repository on CentOS 8.

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