[Samba] DLZ Backend DNS Hosed

[Matthew Delfino]

Hello,


I'm in trouble here with what appears to be a total meltdown of my DNS on my Domain Controllers.


I only have two DCs right now and I cannot resolve anything on either of them. I am on Ubuntu 16.04 with a compiled version of Samba 4.10.4.


I also have a compiled version of BIND 9.10.3-P4-Ubuntu <id:ebd72b3>


# service bind9 status
● bind9.service - BIND Domain Name Server
   Loaded: loaded (/lib/systemd/system/bind9.service; enabled; vendor preset: enabled)
  Drop-In: /run/systemd/generator/bind9.service.d
           └─50-insserv.conf-$named.conf
   Active: failed (Result: exit-code) since Tue 2019-06-18 21:14:39 CDT; 27min ago
     Docs: man:named(8)
  Process: 28347 ExecStop=/usr/sbin/rndc stop (code=exited, status=1/FAILURE)
  Process: 28329 ExecStart=/usr/sbin/named -f $OPTIONS (code=exited, status=1/FAILURE)
 Main PID: 28329 (code=exited, status=1/FAILURE)


Jun 18 21:14:39 cordelia named[28329]: samba_dlz: starting configure
Jun 18 21:14:39 cordelia named[28329]: zone mydomain.com/NONE: has no NS records
Jun 18 21:14:39 cordelia named[28329]: samba_dlz: Failed to configure zone 'mydomain.com'
Jun 18 21:14:39 cordelia named[28329]: loading configuration: bad zone
Jun 18 21:14:39 cordelia named[28329]: exiting (due to fatal error)
Jun 18 21:14:39 cordelia systemd[1]: bind9.service: Main process exited, code=exited, status=1/FAILURE
Jun 18 21:14:39 cordelia rndc[28347]: rndc: connect failed: 127.0.0.1#953: connection refused
Jun 18 21:14:39 cordelia systemd[1]: bind9.service: Control process exited, code=exited status=1
Jun 18 21:14:39 cordelia systemd[1]: bind9.service: Unit entered failed state.
Jun 18 21:14:39 cordelia systemd[1]: bind9.service: Failed with result 'exit-code'.


It appears that somehow I lost my NS records for one of my zones. It seems that I cannot get BIND up long enough to edit anything.


I've been able to delete my non-essential zones with samba-tool:



 #  samba-tool dns zonedelete localhost mydomain.com
 #  samba-tool dns zonedelete localhost 7.168.192.in-addr.arpa
 #  samba-tool dns zonedelete localhost 3.168.192.in-addr.arpa
 #  samba-tool dns zonedelete localhost 2.168.192.in-addr.arpa
 #  samba-tool dns zonedelete localhost 11.168.192.in-addr.arpa
 #  samba-tool dns zonedelete localhost 5.168.192.in-addr.arpa


But now my error is "zone _msdcs.samdom.mydomain.net/NONE: has no NS records" and I am real nervous to delete that zone.


Does anyone know what I can do to get my samba DC to have NS records that my BIND DNS server will understand and therefore load?



Thanks,
Matthew

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