[Samba] Removed a DC but...

[Marco Gaiarin]

Some month ago a local branch office closed; the local branch had a DC,
that i've simply removed the dc with:

	samba-tool domain demote --server=vdcsv1.ad.fvg.lnf.it  -U gaio

(see https://lists.samba.org/archive/samba/2019-February/221195.html)

But this leave some old DNS records, eg:

 root at vdcsv1:~# host -t SRV _kerberos._udp.ad.fvg.lnf.it | awk '{print $NF}'| sed 's/.$//'
 vdctms1.ad.fvg.lnf.it
 vdcsv2.ad.fvg.lnf.it
 vdcsv1.ad.fvg.lnf.it
 vdcpp2.ad.fvg.lnf.it
 vdcud1.ad.fvg.lnf.it
 vdc3t1.ad.fvg.lnf.it
 vdcpp1.ad.fvg.lnf.it

Now, i need to upgrade (finally!) to something more fresh then 4.5.

It is advise to cleanup (manually?) old dns records and do the upgrade,
or i can safely upgrade to, eg, 4.8 and then do something like:

	samba-tool doamin demote --remove-other-dead-server=vdcud1.ad.fvg.lnf.it -U gaio

to have better chance to cleanup data?


Thanks.

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