[RHEL8.0] You can use subscription-manager to register.

[root@ontunev5 mnt]# sudo yum -y install gcc gcc-c++ make autoconf readline readline-devel zlib zlib-devel openssl openssl-devel gettext gettext-devel python3 python3-devel wget icu libicu-devel
Updating Subscription Management repositories.
Unable to read consumer identity
This system is not registered to Red Hat Subscription Management. You can use subscription-manager to register.
Last metadata expiration check: 0:24:03 ago on Wed 02 Oct 2024 03:35:53 PM KST.


$ sudo subscription-manager register --auto-attach

Registering to: subscription.rhshttp://m.redhat.com:443/subscription
Username: 
Password:
The system has been registered with ID: 0acc8115-a052-43d6-9334-25a2df5a5aac
The registered system name is: ontunev5.myguest.virtualbox.org
Installed Product Current Status:
Product Name: Red Hat Enterprise Linux for x86_64
Status:       Not Subscribed

Redhat.com 에서 가입한 ID 및 Password 입력하면 해결