[Samba] ?==?utf-8?q? Joining a samba ad dc domain from another samba installation

[Rowland Penny]

On Fri, 2022-04-29 at 09:09 +0200, François Legal via samba wrote:
> Le Mercredi, Avril 27, 2022 22:57 CEST, François Legal via samba <
> samba at lists.samba.org> a écrit: 
>  
> > Le Mardi, Avril 26, 2022 11:10 CEST, Rowland Penny via samba <
> > samba at lists.samba.org> a écrit: 
> >  
> > > On Tue, 2022-04-26 at 10:36 +0200, François Legal via samba
> > > wrote:
> > > > Le Lundi, Avril 25, 2022 15:24 CEST, Jonathon Reinhart <
> > > > jonathon.reinhart at gmail.com> a écrit: 
> > > >  
> > > > > On Mon, Apr 25, 2022 at 7:13 AM François Legal via samba <> >
> > > > > > > samba at lists.samba.org> wrote:
> > > > > 
> > > > > > samba-tool domain join [my samba domain] DC -k yes --dns-
> > > > > > backend=BIND9_DLZ
> > > > > > --option='idmap_ldb:use rfc2307 = yes'
> > > > > > INFO 2022-04-25 10:41:04,952 pid:374
> > > > > > /usr/lib/python3/dist-packages/samba/join.py #107: Finding
> > > > > > a
> > > > > > writeable DC
> > > > > > for domain '[my samba domain]'
> > > > > > INFO 2022-04-25 10:41:04,973 pid:374
> > > > > > /usr/lib/python3/dist-packages/samba/join.py #109: Found
> > > > > > DC  [my-
> > > > > > dc].[my
> > > > > > samba domain]
> > > > > > ERROR(<class 'samba.join.DCJoinException'>): uncaught
> > > > > > exception -
> > > > > > Can't
> > > > > > join, error: 00002020: Operation unavailable without
> > > > > > authentication
> > > > > > 
> > > > > 
> > > > > I see you used "-k yes". Did you confirm that you have a
> > > > > valid
> > > > > Kerberos TGT
> > > > > for a Domain Admin account? (Run "kinit" to get a ticket and
> > > > > "klist" to
> > > > > check.)
> > > >  
> > > > Yes. I’ve kinit administrator@[my realm], the ticket shows out
> > > > in
> > > > klist afterwards.
> > > > But either using -U administrator (for which no password is
> > > > requested), either --krb5-ccache=/tmp/krb5cc_0 produce the same
> > > > result 
> > > > 
> > > > François
> > > 
> > > Provided that krb5.conf and DNS are set up correctly, you should
> > > just
> > > run 'kinit administrator' to get a ticket.
> > > I take it that you are doing this as root.
> > > 
> > > Rowland
> > > 
> > 
> > Yes, krb5.conf is setup correctly, dns resolver too. KDC is
> > discovered through NS requests successfully, kinit & samba-tool run
> > as root.
> > 
> > François
> > 
> 
> Just to make sure :
> 
> root@[my new dc hostname]:~# more /etc/krb5.conf 
> [libdefaults]
> 	default_realm = [my realm]
> 	dns_lookup_realm = false
> 	dns_lookup_kdc = false
> 
> [realms]
> 	[my realm] = {
> 	kdc = [my dc ip]
> 	}

Good job you did, it is wrong :-)

Try it like this:

[libdefaults]
    default_realm = [my realm]
    dns_lookup_realm = false
    dns_lookup_kdc = true

Rowland