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Re: [Samba] AD bind DNS broken after 4.7.3 -> 4.9.2 upgrade

2018-12-31 20:50 időpontban L.P.H. van Belle via samba ezt írta:
Can you try to upgrade to any 4.8 version then to 4.9.4?
might work, atleast my guess this will have a better chance get passed this bug.

I can confirm that an upgrade to 4.7.3 to 4.8.5 works. But!

After upgrading the dnsupdate did not work, giving these log messages:

[2019/01/02 19:18:42.908955, 0] ../source4/smbd/server.c:466(binary_smbd_main)
  samba version 4.8.5-Debian started.
  Copyright Andrew Tridgell and the Samba Team 1992-2018
[2019/01/02 19:18:56.468276, 0] ../source4/smbd/server.c:638(binary_smbd_main)
  binary_smbd_main: samba: using 'standard' process model
[2019/01/02 19:19:00.030904, 0] ../lib/util/util_runcmd.c:327(samba_runcmd_io_handler) /usr/sbin/samba_dnsupdate: ERROR(runtime): uncaught exception - (9711, 'WERR_DNS_ERROR_RECORD_ALREADY_EXISTS') [2019/01/02 19:19:00.031193, 0] ../lib/util/util_runcmd.c:327(samba_runcmd_io_handler) /usr/sbin/samba_dnsupdate: File "/usr/lib/python2.7/dist-packages/samba/netcmd/__init__.py", line 176, in _run [2019/01/02 19:19:00.031286, 0] ../lib/util/util_runcmd.c:327(samba_runcmd_io_handler)
  /usr/sbin/samba_dnsupdate:     return self.run(*args, **kwargs)
[2019/01/02 19:19:00.031360, 0] ../lib/util/util_runcmd.c:327(samba_runcmd_io_handler) /usr/sbin/samba_dnsupdate: File "/usr/lib/python2.7/dist-packages/samba/netcmd/dns.py", line 940, in run [2019/01/02 19:19:00.031595, 0] ../lib/util/util_runcmd.c:327(samba_runcmd_io_handler)
  /usr/sbin/samba_dnsupdate:     raise e
[2019/01/02 19:19:00.471859, 0] ../lib/util/util_runcmd.c:327(samba_runcmd_io_handler) /usr/sbin/samba_dnsupdate: ERROR(runtime): uncaught exception - (9711, 'WERR_DNS_ERROR_RECORD_ALREADY_EXISTS') [2019/01/02 19:19:00.472011, 0] ../lib/util/util_runcmd.c:327(samba_runcmd_io_handler) /usr/sbin/samba_dnsupdate: File "/usr/lib/python2.7/dist-packages/samba/netcmd/__init__.py", line 176, in _run [2019/01/02 19:19:00.472084, 0] ../lib/util/util_runcmd.c:327(samba_runcmd_io_handler)
  /usr/sbin/samba_dnsupdate:     return self.run(*args, **kwargs)
[2019/01/02 19:19:00.472238, 0] ../lib/util/util_runcmd.c:327(samba_runcmd_io_handler) /usr/sbin/samba_dnsupdate: File "/usr/lib/python2.7/dist-packages/samba/netcmd/dns.py", line 940, in run [2019/01/02 19:19:00.472301, 0] ../lib/util/util_runcmd.c:327(samba_runcmd_io_handler)
  /usr/sbin/samba_dnsupdate:     raise e

and so on...

After downgrading from 4.9.2 back to 4.7.3 I experienced the same, and I could fix it by running "samba_upgradedns --dns-backend=BIND9_DLZ" (at least I guess this fixed it). The results of this command were basically the same as on the wiki page. But this time the result was exactly the same as with 4.9.2:

isa:~/# samba_upgradedns --dns-backend=BIND9_DLZ
Reading domain information
DNS accounts already exist
No zone file /var/lib/samba/bind-dns/dns/MYAD.DOMAIN.EU.zone
DNS records will be automatically created
DNS partitions already exist
dns-isa account already exists
Failed to create link /var/lib/samba/private/dns.keytab -> /var/lib/samba/bind-dns/dns.keytab: No such file or directory
Failed to chown /var/lib/samba/bind-dns to bind gid 107
Failed to chown /var/lib/samba/bind-dns/dns.keytab to bind gid 107
Traceback (most recent call last):
  File "/usr/sbin/samba_upgradedns", line 533, in <module>
    create_dns_dir(logger, paths)
File "/usr/lib/python2.7/dist-packages/samba/provision/sambadns.py", line 697, in create_dns_dir
    os.mkdir(dns_dir, 0770)
OSError: [Errno 2] No such file or directory: '/var/lib/samba/bind-dns/dns'

I started to panic, but since I ran this with samba stopped, I restarted samba and the error messages are gone! The names are resolved and the clients are happily updating the records.

So to summarize, I do not know how it got fixed and why upgradedns does not work, but I believe the bug is already included somewhere in the 4.8 branch. Even if it works.

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