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<div class="moz-cite-prefix">On 08/07/2019 14:31, Dominik Menke
wrote:<br>
</div>
<blockquote type="cite"
cite="mid:0822ca52-a495-b412-57a9-38e79c40fd55@digineo.de"><br>
Just for clarification, in your example.com zone, you have an NS
record pointing to your "challenge DNS server", i.e.
<br>
<br>
_acme-challenge IN NS nsacme.example.org.
<br>
<br>
right? What about subdomains of example.com? Won't they need an NS
record as well?
<br>
<br>
_acme-challenge.db IN NS nsacme.example.org.
<br>
_acme-challenge.git IN NS nsacme.example.org.
<br>
; etc.
</blockquote>
<p><br>
</p>
<p>That's correct: a separate NS record for each domain you want a
certificate for. This is static, so you just add it manually the
first time you want a certificate.<br>
</p>
<p>The top-level one should also allow you to get a <a
moz-do-not-send="true"
href="https://community.letsencrypt.org/t/acme-v2-and-wildcard-certificate-support-is-live/55579">wildcard
certificate</a>, but I've not tried that yet.</p>
<p>Note that if you have split DNS, e.g. where "int.example.org" is
an internal domain on hidden private DNS servers, then on the
outside you can just have a single NS record:</p>
<p>int IN NS nsacme.example.org.</p>
<p>Regards,</p>
<p>Brian.<br>
</p>
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