For a very long time the process on Linux has basically been making sure SSSD / SSSD-AD / realmd were installed, and then running, realm join mydomain.fqdn

For a very long time the process on Linux has basically been making sure SSSD / SSSD-AD / realmd were installed, and then running, realm join mydomain.fqdn Some distros defaulted to SMB (though which, I dont know), and occasionally the default configs of sssd.conf are not sufficient for your organization (such as if you want to use SSH keys via ldap, sudoers, dynamic dns, etc). But generally you were seeing a bunch of guides because they were referring to truly ancient distros.