[Samba] Failed to join domain: failed to find DC for domain...

[Rowland Penny]

On Sat, 9 Sep 2023 11:29:53 -0400
Rob Campbell via samba <samba at lists.samba.org> wrote:

> >
> > It looks like DNS is failing, does /etc/resolv.conf look like this:
> >
> > search home.rob-campbell.lan
> > nameserver A.DC.IPADDRESS
> >
> 
> This is what it looks like in this order (if that matters)
> nameserver 10.0.0.10
> nameserver 10.0.0.1
> search HOME.ROB-CAMPBELL.LAN

The order doesn't matter, just so long as the first nameserver
(10.0.0.10) is a DC.

> 
> >
> > While you are checking, does /etc/hosts contain a line like this:
> >
> > computers_ip computers FQDN computers short_hostname
> >
> 
> Yes
> 
> root at D01:~/.bin# realm leave

I suggest you stop using realmd, it isn't a Samba product and you do
not need it, the same goes for sssd if it is also installed.

> root at D01:~/.bin# net ads join -U administrator
> Password for [HOME\administrator]:
> Failed to join domain: failed to connect to AD: No logon servers are
> currently available to service the logon request.

Why can it not find a DC ? Is there a firewall or similar running ?

> root at D01:~/.bin# samba-tool domain join home.rob-campbell.lan MEMBER
> -U administrator

That does basically the same as 'net ads join', so if one fails, the
other isn't likely to work.


> 
> ./check_smb.sh
>  144310 ?        Ss     0:00 smbd
>  144311 ?        S      0:00 smbd
>  144312 ?        S      0:00 smbd
>  144320 ?        Ss     0:00 nmbd
>  144321 pts/1    S+     0:00 /bin/bash ./check_smb.sh
>  144323 pts/1    S+     0:00 grep -E samba|smb|nmb|winbind

From that, it looks like smbd and nmbd are running, but winbind isn't.
At this point (before the join), none of them should be running.

Rowland