LAlAz2imOvV·Apr 8, 2020
There are a few examples in rubydns code eg. https://github.com/socketry/rubydns/blob/master/examples/wik...
In Show HN: Wikipedia over DNSsocketry
rubydns
Ruby2020–2020
socketry / rubydns
rubydns
A DSL for building fun, high-performance DNS servers.
2Distinct people
2Mentions
0Explicit recommenders
727GitHub stars
What to know before exploring
What it is
A DSL for building fun, high-performance DNS servers.
GitHub
Where it is used
No documented product use has been verified yet.
What people are saying
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Also in these discussions
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This week on Hacker News
Nov 7–Nov 14 UTC · Direct repository links and separately labeled related project stories. Indexed through 11/14/2026, 1:49:46 PM UTC.
No direct repository links were found in the indexed HN discussions over the past seven days. Older discussions are available below.
Mentions over time
HN mentions by week2 dated mentions
Observed mentions: 2020-02-12 18:23:51 UTC to 2020-04-08 06:38:28 UTC. Weeks start Monday, UTC.
Counts come from the repository’s dated source evidence. Index cutoff: 2026-11-02 08:16:59 UTC.
View mention counts and date ranges
| Period | Start (UTC) | End (exclusive, UTC) | Mentions | Submissions | Comments |
|---|---|---|---|---|---|
| Feb 10 | 2020-02-10 00:00:00 UTC | 2020-02-17 00:00:00 UTC | 1 | 0 | 1 |
| Feb 17 | 2020-02-17 00:00:00 UTC | 2020-02-24 00:00:00 UTC | 0 | 0 | 0 |
| Feb 24 | 2020-02-24 00:00:00 UTC | 2020-03-02 00:00:00 UTC | 0 | 0 | 0 |
| Mar 2 | 2020-03-02 00:00:00 UTC | 2020-03-09 00:00:00 UTC | 0 | 0 | 0 |
| Mar 9 | 2020-03-09 00:00:00 UTC | 2020-03-16 00:00:00 UTC | 0 | 0 | 0 |
| Mar 16 | 2020-03-16 00:00:00 UTC | 2020-03-23 00:00:00 UTC | 0 | 0 | 0 |
| Mar 23 | 2020-03-23 00:00:00 UTC | 2020-03-30 00:00:00 UTC | 0 | 0 | 0 |
| Mar 30 | 2020-03-30 00:00:00 UTC | 2020-04-06 00:00:00 UTC | 0 | 0 | 0 |
| Apr 6 | 2020-04-06 00:00:00 UTC | 2020-04-13 00:00:00 UTC | 1 | 0 | 1 |
What Hacker News says
2 sourcesI haven't looked at DNS in depth in a very very long time. My recollection is that it is a pretty simple protocol. Is that still the case?
If it is, I wonder if it would be reasonable to build a small stand-alone DNS server specifically to use with Let's Encrypt for this. You run this on your own server, and it only handles the domains that you need to satisfy Let's Encrypt.
Point the _acme-challenge record there with a CNAME on your "real" DNS server, and whenever you are getting or renewing a Let's Encrypt certificate, bring up the small stand-alone server.
When the certificate issues or is renewed, shut down the small stand-alone server.
Some Googling of the form "simple DNS server $LANG" for various programming languages $LANG turns up a few that could provide nice starting points.
Perl: on meta::cpan there is Net::DNS::Nameserver, me
Read the rest
ant to provide a local nameserver for testing local client resolvers, but would probably be adaptable.
Python: [1] under 50 lines and using no imports other than "socket". It's very minimal, but shows dealing with the protocol. [2] [3] [4] are all using something called "dnslib". [2] is nearly 150 lines, but it is more complicated than we need. It's even using multithreading. Same for [3]. [4] is much similar, and much smaller (comparable to using Net::DNS::Nameserver in Perl). Another library for simple DNS in Python is pydnserver [5].
PHP: I didn't find anything simple. All I found was much more full featured and many more lines of code than we need.
Go: [6].
Bash: [7]. I'm not sure what disturbs me more. That someone made this, or that I searched for it.
Ruby: [8].
[1] http://code.activestate.com/recipes/491264-mini-fake-dns-ser...
[2] https://gist.github.com/andreif/6069838
[3] https://gist.github.com/pklaus/b5a7876d4d2cf7271873
[4] https://stackoverflow.com/questions/33531551/how-to-create-a...
[5] https://pypi.org/project/pydnserver/
[6] https://gist.github.com/walm/0d67b4fb2d5daf3edd4fad3e13b162c...
[7] https://gist.github.com/CheRuisiBesares/f35f71f028926e65191d...
[8] https://github.com/socketry/rubydns