Freeradius systemd radiusd.service fails

[Alan Buxey]

Read the output of those 2 commands it gives you (really,  systemd does try to help you! ) . Ensure that the permissions of all files in raddb config are correct - owned by and readable by the user/gtoup that radiusd runs as. Ensure that all log/other locations are the same. 
If your module requires other environment variables ensure that those are in the startup scripts. 

Finally.  If using selinux et al , check those audit logs to see if the system believes that the daemon has no right to connect to certain ports etc and fix those issues (LOTS of people using postgres/mariadb etc so those systems are pretty well covered but oracle is rare and distro operators,  for example,  will not have provided patches/fixes/updates to deal with it)

alan