Join domain as secondary domain controller

bogdan_bartos admin at
Sat Jun 6 15:24:02 MDT 2015

I am trying to joing an existing samba 4 DC and it's giving me an error:

[root at backupdc bin]# host -t A has address

[root at backupdc bin]# cat /etc/krb5.conf
    dns_lookup_realm = true
    dns_lookup_kdc = true
    default_realm = FILESERVER.SPECIFIED.CA

[root at backupdc bin]# kinit
Password for administrator at FILESERVER.SPECIFIED.CA:
Warning: Your password will expire in 41 days on Sat 18 Jul 2015 01:58:01 PM

[root at backupdc bin]# klist
Ticket cache: FILE:/tmp/krb5cc_0
Default principal: administrator at FILESERVER.SPECIFIED.CA

Valid starting     Expires            Service principal
06/06/15 15:42:02  07/06/15 01:42:02 
        renew until 07/06/15 15:41:59

[root at backupdc bin]# ./samba-tool domain join DC
Finding a writeable DC for domain ''
ERROR(exception): uncaught exception - Failed to find a writeable DC for
domain ''
line 175, in _run
    return*args, **kwargs)
line 613, in run
    machinepass=machinepass, use_ntvfs=use_ntvfs, dns_backend=dns_backend)
  File "/usr/local/samba/lib64/python2.7/site-packages/samba/", line
1161, in join_DC
    machinepass, use_ntvfs, dns_backend, promote_existing)
  File "/usr/local/samba/lib64/python2.7/site-packages/samba/", line
79, in __init__
    ctx.server = ctx.find_dc(domain)
  File "/usr/local/samba/lib64/python2.7/site-packages/samba/", line
267, in find_dc
    raise Exception("Failed to find a writeable DC for domain '%s'" %

What do you sugest? I did this before and it worked like a charm on another

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