#RUN DYN UPDATER AS A SERVICE HOW TO#
#RUN DYN UPDATER AS A SERVICE INSTALL#
#RUN DYN UPDATER AS A SERVICE UPDATE#

The default template is called, well, default, and is applied automatically to all zones that do not specify another template. While it is possible to define it without using a zone template, I put it here because you may have additional zones you want to serve (like me) and it quickly becomes confusing without using templates. Make sure to give the same key name in acl.key as in key.id.Īgain, the ACL identifier can be chosen arbitrarily. Next we need to declare an access control list to allow local updates to the zone. Paste the key section into the config and ignore the comment for now, which contains the same secret but in a different format. You can choose any identifier in place of sftdyn. Secret: kFJd7k6xH8FYToPRgJf7AAkiMUmSoiX2aAAvoUSHcttgn7slf2REBNsw8tvvawCYOIpSr3cgEvoa7fpOKpEXNQ= # hmac-sha512:sftdyn:kFJd7k6xH8FYToPRgJf7AAkiMUmSoiX2aAAvoUSHcttgn7slf2REBNsw8tvvawCYOIpSr3cgEvoa7fpOKpEXNQ=

Here it is in its entirety, which I will explain in detail below: The configuration file sits at /etc/knot/nf.īy default, it is quite small, and we have to extend it substantially.

#RUN DYN UPDATER AS A SERVICE INSTALL#

We start with choosing a DNS server software.įor me, Knot DNS fit the bill, and I installed it with apt install knot on an Ubuntu machine.

add a cronjob to the local clients to make HTTP requests to the web server.

on the same DNS server also install a web server that processes updates, and.

make sure that the parent zone (here: domain.tld) contains an NS record pointing to the server,.

install a DNS server that is authoritative for a subdomain (here: ) of some domain,.

There did not seem to be any off-the-shelf solution for this use case whose popularity I had underestimated.Īnyhow, nothing a bit of glue, duct tape, and Python can’t fix.īut note that I did not want to wrangle DNSSEC, so I’m conveniently leaving that part out.

#RUN DYN UPDATER AS A SERVICE UPDATE#

While browsing the web for possible existing implementations, I quickly realized that while there are tons of DNS server implementations, I actually had to build my own script to update the configuration. The configuration is maintained manually.Īlso, a dynamic DNS server obviously needs to have a stable IP address, so I had to resort to use a virtual machine somewhere in a datacenter. I already have a local DNS server running, but I used it for recursive lookups and ad-blocking purposes.

I found the existing providers I had used in the past to be annoying.

In order to reach my home server from the outside, I decided to build my own dynamic DNS service.

#RUN DYN UPDATER AS A SERVICE HOW TO#

How to build your own personal DynDNS serviceĬonsumer-grade internet subscriptions typically come with NAT and dynamically-assigned IP addresses. How to build your own personal DynDNS service Lars Hupel.

# Run the display ddns interface gigabitethernet 1/0/0 command on Router to check information about the DDNS policy of GE1/0/0. # Run the display ddns policy mypolicy command on Router to check information about the DDNS policy named mypolicy. When the configuration is complete and the IP address of GE1/0/0 changes, Router notifies the DNS server to update the mapping relationship between the domain name and the IP address, ensuring that users can obtain the latest IP address by parsing the domain name

Run dyn updater as a service