Can't start Samba on Fedora Linux

Question

I'm trying to get Samba running as an Active Directory Domain Controller with Kerberos, but when I try to start its service I get a strange error that I can't seem to find anywhere on the internet. Running

sudo systemctl start samba

fails, and

sudo systemctl status samba

afterwards gives this.

The error seems to be at

samba_terminate: samba_terminate of samba 1363: KDC: Unable to start kpasswd server

but I haven't been able to find anyone else having this error anywhere.

As far as I can tell, Kerberos is running fine;

sudo systemctl status kadmin.service

and

sudo systemctl status krb5kdc.service

give this:

kadmin status

krb5kdc status

The only thing weird I see in there is in krb5kdc's status, with

krb5kdc.service: Can't open PID file /run/krb5kdc.pid (yet?) after start: No such file or directory

But I've looked that up and it seems that it doesn't matter; just an error where krb5kdc tries to access a file before one of its child processes can create it. (And checking that directory, the file does exist)

Looking at KDC's logs at /var/log/samba/mit_kdc.log reveals this from the last reboot I did.

I really have no idea what's going on; something's got to have been set up wrong, but I don't know what.

I'm running Fedora 31 and Samba version 4.11.2.

Answer 1

Fixed; turned out it was because I had already started the kadmin and krb5kdc services, and since samba starts those services itself, this was causing the error.