Installing RHEL 7.9 in Virtualbox 6.1

Download the trial from: https://access.redhat.com/downloads

Open Virtualbox, create a new Virtual Machine, and select the downloaded iso.

Boot from the ISO, install as normal. Be sure to set a secure root password, and create a new user that has administrative access.

On boot, login using your new user.

Enable Networking

By default, networking will not work with Virtualbox, so we have to enable it:

sudo vi /etc/sysconfig/network-scripts/ifcfg-enp0s3

Search for ONBOOT and set it to yes. It should look like:

ONBOOT=yes

Save and write the file. Then enter:

sudo systemctl restart network

Networking should work now.

Registering the VM

Time to register the machine with Redhat:

sudo subscription-manager register --username YOUR_USERNAME_HERE
sudo subscription-manager attach --auto

Now update your OS:

sudo yum update

Installing Virtualbox Guest Additions

Now to install VirtualBox Guest Additions, be sure to load the cd in Virtualbox VM, then go back into the terminal and enter:

sudo yum install gcc perl bzip2 kernel-headers "kernel-devel-uname-r == $(uname -r)"
sudo yum groupinstall 'Development Tools'
mkdir ~/cdrom
sudo mount /dev/cdrom ~/cdrom
cd ~/cdrom
sudo ./VBoxLinuxAdditions.run

Now reboot the VM. That's it! Be sure to disable root access via SSH.