Creating a local yum repository

If you cannot use yum to install updates because your management server is not connected to the internet, you must create a local repository using the proper Linux ISO distribution image.

1. Download the applicable Linux ISO image (for example, rhel-8.5-x86_64-dvd.iso) on a server with internet access and copy the file to the management server.
2. Create a directory and mount the ISO image using the following commands:

   mkdir /media/OSImage
   mount -o loop filename.iso /media/OSImage

3. If the /etc/yum.repos.d directory contains an existing repo file, rename the file extension or delete it.
4. Use a file editor to create the new repository file, as in this example using vim:

   vim /etc/yum.repos.d/local.repo

5. Configure the yum repository by copying and pasting the following text into the file:

   [dvd-baseos]
   name=dvd-baseos
   baseurl=file:///media/OSImage/BaseOS/
   gpgcheck=0
   enabled=1
   
   [dvd-appstream]
   name=dvd-appstream
   baseurl=file:///media/OSImage/AppStream/
   gpgcheck=0
   enabled=1

6. Save the file.