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fiat
Asked: 2024-05-20 10:42:24 +0800 CST

Resolve DNS for short name of the Active Directory domain

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In trying to configure a SQL Server container for Active Directory, [the instructions]

(https://learn.microsoft.com/en-us/sql/linux/sql-server-linux-active-directory-join-domain?view=sql-server-ver16#check-the-connection-to-a-domain-controller) and troubleshooting

state that:

Check that you can contact the domain controller by using both the short and the fully qualified names of the domain

DNS lookups on the domain name and NetBIOS name should return the same IP address

For example, my Active Directory domain mydomain.dev, should resolve using:

nslookup mydomain

In both my test and production environment this lookup doesn't work.

$ nslookup mydomain.dev
Server:         127.0.0.53
Address:        127.0.0.53#53

Non-authoritative answer:
Name:   mydomain.dev
Address: 172.31.10.20

$ nslookup mydomain
Server:         127.0.0.53
Address:        127.0.0.53#53

** server can't find mydomain: SERVFAIL

Where/how do I configure this short/NetBIOS name?

The DC is Windows Server 2022 and I have otherwise setup the DNS, AD etc.

active-directory

2 Answers

  1. Best Answer

    Windows DNS can resolve short names. You can enable and populate the GlobalNames zone on the DNS server.

    DNS suffix search order and hosts file client side solutions also work.

    https://learn.microsoft.com/en-us/powershell/module/dnsserver/set-dnsserverglobalnamezone

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  2. Thanks to @yagmoth555 comment, I realised that my /etc/systemd/resolved.conf was wrong and I had repeated the error in test and production

    It was

    [Resolve]
DNS=172.31.10.20
Domains=mydomain.dev mydomain

    but it should have been

    [Resolve]
DNS=172.31.10.20
Domains=mydomain.dev dev

    Resolution now works: nslookup mydomain

    Server:         127.0.0.53
Address:        127.0.0.53#53

Non-authoritative answer:
Name:   mydomain.dev
Address: 172.31.10.20
    • 1