From Fedora Project Wiki
1. Install the prerequisites:
# yum install -y realmd oddjob oddjob-mkhomedir sssd adcli samba-common
2. Have realmd discover the AD host:
# realm discover example.com
3. Have realmd join the AD host and type the AD Administrator password when prompted:
# realm join example.com
After following the above commands, you should be able to run the following against the AD domain:
# id someone@example.com # ssh someone@example.com@localhost