[Samba] Samba 4.x to 4.9 upgrade and bind DLZ dns.

[L.P.H. van Belle]

Hai Guys, 

Just a general notification. 

Currently if you run samba 4.x-4.8 and upgraded to 4.9.0-4.9.4 on bind9 dns. 
Your missing the new folders. 

So even when your already running on bind9_dlz, follow these steps, 
and prevent possible problems in future. 

# create the missing folder. 
mkdir -p /var/lib/samba/bind-dns/dns

# use samba_upgradedns to move the files and folder and fixes rights.
samba_upgradedns --dns-backend=BIND9_DLZ
... Yes, even if you already run bind9_dlz. 

# Change the path in bind. So samba can load the needed named.conf again. 
sed -i 's/private/bind-dns/g' $(rgrep "samba/private/named.conf" | awk -F":" '{ print $1 }')

# restart bind and samba
systemctl restart bind9 samba-ad-dc

And your done. 

Greetz, 

Louis