[Wayback/Archive] RubyConf Mini 2022: Keynote: Learning DNS by Julia Evans – YouTube
Via [Wayback/Archive] 🔎Julia Evans🔍 on Twitter: “Just noticed that the recording of my keynote “Learning DNS in 10 Years” from @RubyConfMini is up!”
–jeroen
Archive for the ‘DNS’ Category
RubyConf Mini 2022: Keynote: Learning DNS by Julia Evans – YouTube
Posted by jpluimers on 2026/06/18
Posted in Communications Development, Development, DNS, Internet, Internet protocol suite, Power User, Software Development, TCP, UDP | Leave a Comment »
vmstan/gravity-sync: 💫 The easy way to synchronize the DNS configuration of two Pi-hole 5.x instances.
Posted by jpluimers on 2026/01/28
Interesting: [Wayback/Archive] vmstan/gravity-sync: 💫 The easy way to synchronize the DNS configuration of two Pi-hole 5.x instances.
Reasoning: [Wayback/Archive] Frequent Questions: Why two Pi-hole? · vmstan/gravity-sync Wiki
Via:
- [Wayback/Archive] Can PiHole work fine for more than 100k clients? : pihole
- [Wayback/Archive] Gravity Sync, an easy way to keep multiple Pi-hole In-sync – General / Customizing Pi-hole – Pi-hole Userspace
What is better than a Pi-hole blocking ads via DNS on your network? That’s right, Two Pi-hole! But if you have more than one Pi-hole (PH) in your network you’ll want a simple way to keep the list configurations identical between the two. I’ve recently been toiling away at a script to do exactly this, and what started as a few lines lines of bash was shared with some friends, and has grown into what I now call Gravity Sync — which I’d now like to share with you all for your feedback.
–jeroen
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Posted in *nix, *nix-tools, bash, bash, Development, DNS, Hardware Development, Internet, Power User, Raspberry Pi, Scripting, Software Development | Leave a Comment »
DNS/web options: How to verify your Bluesky account – Bluesky
Posted by jpluimers on 2025/07/21
Just in case I ever want to bind a BSKY handle to a domain name I own:
- [Wayback/Archive] How to verify your Bluesky account – Bluesky
- [Wayback/Archive] Bluesky with own domain-handle and .well-known/atproto-did – Capi’s Corner
Via:
- [Wayback/Archive] Jilles Groenendijk: “Welcome to BlueSky. In this post you will find a 2 starter packs for both Dutch as well as InfoSec people to follow to get you kickstarted here. Profile names use different characters. You can claim your own domain-name as username (like I did) by registering an _atproto TXT dns-record.” — Bluesky
You can claim your own domain-name as username (like I did) by registering an
_atprotoTXTdns-record. - [Wayback/Archive] _atproto dns – Sök på Google
- [Wayback /Archive] “_atproto” dns – Sök på Google
--jeroen
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Posted in BlueSky, Development, DNS, Hosting, Internet, Power User, SocialMedia, Software Development, Web Development | Leave a Comment »
Some posts on example domains and example IP-ranges (IPv4 and IPv6)
Posted by jpluimers on 2025/05/05
Here are some of my blog posts on documenting using example domains and example IP-addresses or IP-ranges:
- RFC2606: Reserved Top Level DNS Names (RFC); draft-ellermann-idnabis-test-tlds-04: Reserved Top Level DNS Names (Internet-Draft, 2008)
- A url or site like example.org which always produces a 404 error (and two for 200 and 204)
- Example.[com|net|org] Web Page
- The Bogon Reference – Team Cymru
(I really wish that example.org and others would service SMTP with blackhole routing so one can also use it for bogus email addresses in documentation)
The blog posts above were incomplete (IPv6 was missing; IPv4 was not explained), so below are more links that do a better job based on a Tweet from [Wayback/Archive] Julia Evans (@b0rk).
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Posted in Conference Topics, Conferences, Development, DNS, documentation, Event, Infrastructure, Internet, IPv4, IPv6, Power User, Software Development | Leave a Comment »
“NAMED_CONF_INCLUDE_FILES” has been gone from /etc/sysconfig/named since OpenSuSE 15.4
Posted by jpluimers on 2025/04/28
In the past, I used to modify /etc/sysconfig/named and add entries to the NAMED_CONF_INCLUDE_FILES setting, then run /usr/share/bind/createNamedConfInclude
to generate /etc/named.conf.include.
As of OpenSuSE 15.4, /usr/share/bind/createNamedConfInclude has become an empty file and NAMED_CONF_INCLUDE_FILES got removed and NAMED_INITIALIZE_SCRIPTS introduced.
So now I changed my playbooks to manually generate /etc/named.conf.include and include it form /etc/sysconfig/named.
Since I hardly perform these new installations, it took a few years for me to find out about this change. Upgrading existing systems somehow kept the generated file and included it.
Related links with quotes as it was hard to find out what changed and how to work around and I wasn’t the only one bump into issues:
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Posted in *nix, *nix-tools, bash, bash, bind-named, Development, DNS, LEAP, Linux, openSuSE, Power User, Scripting, Software Development, SuSE Linux | Tagged: include | Leave a Comment »
DNS Checker – DNS Check Propagation Tool
Posted by jpluimers on 2024/05/24
Not that long ago I learned about [Wayback/Archive] DNS Checker – DNS Check Propagation Tool:
CHECK DNS PROPAGATION
Recently changed your DNS records, switched web host, or started a new website: then you are at the right place! DNS Checker provides a free DNS lookup service to check Domain Name System records against a selected list of DNS servers located in multiple regions worldwide. Perform a quick DNS propagation lookup for any hostname, and check DNS data collected from all available DNS Servers to confirm that the DNS records are fully propagated.
I wish I had known it before as it is a great tool to verify DNS lookups from around the world.
For my link archive (A and SOA records are the most important to me):
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Julia Evans (b0rk on Twitter) does not just make cool zines (like the DNS one) but also cool sites (the DNS lookup one). It’ is better than Google Toolbox, IntoDNS and others
Posted by jpluimers on 2024/01/31
A while after writing notes on updating DNS info with bind DNS, b0rk (Julia Evans) posted about her DNS zine which got a reply about her DNS lookup tool. Below is part of that thread.
The reason I post is that – unlike the Google DNS ToolBox – you can bookmark her DNS tool link including the actual search part, which makes it far easier to do systems administration.
Examples:
- [Wayback/Archive] DNS lookups!
- [Wayback/Archive] DNS lookups! –
example.org– all records - [Wayback/Archive] DNS lookups! –
example.org–SOA - [Wayback/Archive] DNS lookups! –
wiert.me– all records - [Wayback/Archive] DNS lookups! –
wiert.me–SOA
There is a trace tool too:
- [Wayback/Archive] DNS lookups! –
trace - [Wayback/Archive] DNS lookups! –
trace–example.org - [Wayback/Archive] DNS lookups! –
trace–wiert.me
The thread:
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Posted in Development, DNS, Go (golang), Internet, Power User, Software Development, Web Development | Leave a Comment »
Guess the maximum DNS Response Size… (by Jan Schaumann)
Posted by jpluimers on 2023/12/26
Every once in a while Jan Schaumann writes a long Twitter thread and saves it in a blog post. Always good ways to learn. This time it was no different: [Wayback/Archive] DNS Response Size started with
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Posted in Communications Development, Development, DNS, Internet, Internet protocol suite, IPv4, IPv6, Power User, TCP, tcpdump, UDP, Wireshark | Leave a Comment »
b0rk does fun things with DNS: CNAME records at the root of the domain; technically not allowed, definitely not recommended, but somehow work for web browsing
Posted by jpluimers on 2023/12/21
[Wayback/Archive] 🔎Julia Evans🔍 on Twitter: “I’ve always heard that you can’t create CNAME records at the root of the domain. But apparently you can? It seems to work fine as far as I can tell but I’m curious about the possible consequences. (yes, I registered cnameroot.com just to make this tweet) “
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Posted in Cloud, Cloudflare, DNS, Infrastructure, Internet, Power User | Leave a Comment »
notes on updating DNS info with bind DNS
Posted by jpluimers on 2023/12/01
Steps:
- Edit the DNS zone file in
/var/lib/named/master - Make sure you updated the SOA serial number
rcnamed restart- Watch
/var/lib/named/log/generalfor errors (you can even increase logging, for instance by reading [Wayback/Archive] this serverfault entry and editing/etc/named.d/logging) and – on my system – these other logs for the actual zone transfers:/var/lib/named/log/in-xfer.logfor incoming zone transfers on the secondary server/var/lib/named/log/notify.logfor notifications of zone transfers on the primary and secondary servers/var/lib/named/log/out-xfer.logfor outgoing zone transfers on the primary server
- Check on [Wayback/Archive] mxtoolbox.com/SuperTool.aspx?action=dns:example.org&run=toolpage# to see if the SOA serials have been replicated (one day I will write a bookmarklet for this)
Alternatives for the last step are sites like these:
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The Wiert Corner - irregular stream of stuff 