Cannot join as secondary DC - samba 4.2.2 - <bug?>

bogdan_bartos admin at
Sat Jun 6 19:53:28 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'" %

[root at backupdc bin]# ./samba-tool dns query fileserver f                                                                              ALL
  Name=, Records=3, Children=0
    SOA: serial=22, refresh=900, retry=600, expire=86400, minttl=0,
ns=fileserve                                                                             ,
000f0, serial=22, ttl=3600)
    NS: (flags=600000f0, serial=110,
    A: (flags=600000f0, serial=110, ttl=900)
  Name=_msdcs, Records=0, Children=0
  Name=_sites, Records=0, Children=1
  Name=_tcp, Records=0, Children=4
  Name=_udp, Records=0, Children=2 

This happens on samba 4.22. What do you sugest? I have extended acls on the
xfs filesystem.

[root at backupdc ~]# cat /etc/fstab

# /etc/fstab
# Created by anaconda on Sun May 31 09:34:12 2015
# Accessible filesystems, by reference, are maintained under '/dev/disk'
# See man pages fstab(5), findfs(8), mount(8) and/or blkid(8) for more info
/dev/mapper/fedora-root /                       xfs   
user_xattr,acl,barrier=1          1 1
UUID=75d1dec5-5499-4985-835b-3cd66e22f944 /boot                   ext4   
defaults        1 2
/dev/mapper/fedora-swap swap                    swap    defaults        0 0

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