Holy Moly. Maybe I just needed some rest.
After I ran (like you did)
sudo kdb5_util create -s -r MYCOOLNAME.COM
I then ran this:
sudo systemctl restart krb5-kdc.service
Then I ran this (below) (maybe you don't need sudo on this one)
sudo systemctl status krb5-kdc.service
And ( INSTEAD OF THE ERROR VORTEX I was getting before ) .... I instead got the below ( success !!!):
$ systemctl status krb5-kdc.service
● krb5-kdc.service - Kerberos 5 Key Distribution Center
Loaded: loaded (/lib/systemd/system/krb5-kdc.service; enabled; vendor preset: enabled)
Active: active (running) since Tue 2020-02-25 03:16:25 EST; 4min 45s ago
Process: 5749 ExecStart=/usr/sbin/krb5kdc -P /var/run/krb5-kdc.pid $DAEMON_ARGS (code=exited, status=
Main PID: 5763 (krb5kdc)
Tasks: 1 (limit: 4915)
CGroup: /system.slice/krb5-kdc.service
└─5763 /usr/sbin/krb5kdc -P /var/run/krb5-kdc.pid
Feb 25 03:16:25 myloginname krb5kdc[5749]: Setting pktinfo on socket 0.0.0.0.88
Feb 25 03:16:25 myloginname krb5kdc[5749]: Setting up UDP socket for address ::.88
Feb 25 03:16:25 myloginname krb5kdc[5749]: setsockopt(12,IPV6_V6ONLY,1) worked
Feb 25 03:16:25 myloginname krb5kdc[5749]: Setting pktinfo on socket ::.88
Feb 25 03:16:25 myloginname krb5kdc[5749]: Setting up TCP socket for address 0.0.0.0.88
Feb 25 03:16:25 myloginname krb5kdc[5749]: Setting up TCP socket for address ::.88
Feb 25 03:16:25 myloginname krb5kdc[5749]: setsockopt(14,IPV6_V6ONLY,1) worked
Feb 25 03:16:25 myloginname krb5kdc[5749]: set up 6 sockets
Feb 25 03:16:25 myloginname krb5kdc[5763]: commencing operation
Feb 25 03:16:25 myloginname systemd[1]: Started Kerberos 5 Key Distribution Center.
lines 1-19/19 (END)
And I teared up some.
Below is my complete list.....
(PURGE (and start over..sigh...again) (below) )
sudo rm -rf /etc/krb5conf
sudo rm -rf /var/lib/krb5kdc
sudo rm -rf /etc/krb5.conf
sudo apt purge -y krb5-kdc krb5-admin-server krb5-config krb5-locales krb5-user krb5.conf
("purge" commands above from .. from https://github.com/shafiquejamal/kafka-zookeeper-kerberos/blob/master/README-Kerberos.md )
(REINSTALL) (below)
sudo apt install krb5-kdc krb5-admin-server krb5-config krb5-locales krb5-user krb5.conf
sudo kdb5_util create -s -r MYCOOLNAME.COM
(and finally...to resolve the "Cannot open DB2 database '/var/lib/krb5kdc/principal'" issue) (below)
sudo systemctl status krb5-kdc.service
sudo systemctl restart krb5-kdc.service
Other helpful links:
https://medium.com/@vikramaroskar/getting-started-with-65711be52918
Unable to setup Kerberos on Ubuntu 14.04 - krb5kdc: No such file or directory - while initializing database for realm myrealm