Enable EPEL repository on Oracle Linux 9

Make sure install the [oracle-epel-release-el9] package.

dnf install oracle-epel-release-el9

Enable EPEL repository:

dnf config-manager --enable ol9_developer_EPEL
dnf update

Install packages from EPEL repository:

dnf install certbot python3-certbot-nginx
dnf install fail2ban
dnf install etckeeper