samba 4.7.0 AD DC: FSMO roles transfer error

[Rowland Penny]

On Thu, 12 Oct 2017 15:12:29 +0200
Daniele Dario <d.dario76 at gmail.com> wrote:

> 
> Mhh.
> 
> On mer, 2017-10-11 at 19:11 +0100, Rowland Penny via samba-technical
> wrote:
> > On Wed, 11 Oct 2017 20:03:03 +0200
> > Daniele Dario <d.dario76 at gmail.com> wrote:
> > 
> > > Hi Rowland,
> > > the DCs are both local and running on ubuntu 16.04 x64.
> > > 
> > > The timeout problem disappear if I put a second delay between
> > > transfer calls.
> > > 
> > > The other error happens exactly when transfer dns roles is
> > > performed and adding the import seems to fix the issue.
> > > 
> > > Daniele
> > 
> > sudo apt-get install python
> > 
> > Might be a good idea, Just checked and Ubuntu 16.04 comes with
> > python 3.5.1 by default and the whilst the Samba python code is
> > being ported to python 3, you still need python 2.7
> > 
> > Rowland
> > 
> 
> As far as I can see, there are both installed or am I missing
> something?
> 
> root at kdc02:~# apt list -a python3.5
> Listing... Done
> python3.5/xenial-updates,now 3.5.2-2ubuntu0~16.04.3 amd64 [installed]
> python3.5/xenial-security 3.5.2-2ubuntu0~16.04.1 amd64
> python3.5/xenial 3.5.1-10 amd64
> 
> root at kdc02:~# apt list -a python2.7
> Listing... Done
> python2.7/xenial-updates,xenial-security,now 2.7.12-1ubuntu0~16.04.1
> amd64 [installed,automatic]
> python2.7/xenial 2.7.11-7ubuntu1 amd64
> 
> Same on kdc01.
> 
> My python is not as good as I would but AFAIK if I want to address
> samba.drs_utils this means drs_utils has to be something visible
> inside samba but it isn't so I think it is needed to add the line
> import samba.drs_utils
> 
> About the timeout error: the two DCs are local and traffic on LAN was
> normal. I had just updated to 4.7.0 the first DC when tried to
> transfer the roles to it before upgrading the other one.
> 
> Adding a timeout between transfers allowed to move the roles from one
> to the other and vice-versa without timeouts reliably.
> 
> Daniele.
> 

You are the first person to have this problem and 'fsmo.py' has never
had 'import samba.drs_utils'. This is why I think it is a problem with
python, the default on Ubuntu 16.04 is probably 3.5.2, what does
'python -V' show ?
Samba requires python >= 2.4

Rowland