Today I encounter an interesting task about system administration: Configure your system to automatically loop-mount the ISO of the installation disk on the directory /repo. Configure your system to remove this loop-mounted ISO as the only repository that is used for installation. Do not register your system with subscription-manager, and remove all reference to external repositories that may already exist. This is a common issue when you set up the VM: After you finish installing Linux, you want to boot the Linux normally, rather than running into the installation disk again. So when you install Linux, you attach the iso image. Later detach the iso so that Linux can boot normally. This could be easily done from virtualization software such as VirtualBox, VMWare Workstation, thanks to their user-friendly UI. However, this task asks you to do it through automation. In system admin books, this is barely mentioned. But it's still worth digging: in the scenario where you're settin...