I also encountered this requirement and created a tool to handle it. It runs as a non-privileged user and is independent of dhclient and the like. My DNS zones are hosted in AWS, so it uses their API. No other DNS providers are supported.
https://github.com/jsleeio/ru1 I'm much more sysadmin than developer but this has been sufficiently reliable that I forget it's there John On Sun, 26 Apr 2020 at 12:00, Bryan Stenson <bryan.sten...@gmail.com> wrote: > I've thought about this as well....and would love to use native > OpenBSD tools for the job. > > Just a design idea: > > 1. Use dhcpd(8) synchronization > (https://man.openbsd.org/dhcpd.8#SYNCHRONISATION) to send details of > dhcp leases to a DNS creator/listener. > 2. The dns creator/listener creates/updates the zone file, and > 3. Send a SIGHUP to nsd(8) (https://man.openbsd.org/nsd.8#SIGHUP) to > reload the zone details. > > Issues to consider: > 1. hostname collisions - what happens (what should happen?) when more > than one dhcp client has the same hostname? > 2. what should ttl on these A records be? probably something much > less than the dhcp lease duration (depending on how aggressive clients > are at renewing soon-to-be-expired leases). > > I'm sure there are a thousand other things to consider > here...thoughts/ideas? > > On Sat, Apr 25, 2020 at 3:10 PM Raymond, David <david.raym...@nmt.edu> > wrote: > > > > I use dnsmasq (an openbsd package) on the gateway for my lab ethernet > > network and it works great with minimal configuration as a local DNS > > server. At home I have a Synology wireless router which does the same > > as long as you tell it to make DNS reservations. Your mileage may > > vary with cheaper routers. One could in principle use dnsmasq even in > > this case, but I haven't tried it. > > > > > > Dave Raymond > > > > On 4/25/20, bofh <goodb...@gmail.com> wrote: > > > Hi, > > > I searched through the archives and saw a couple of discussions about > using > > > Dnsmasq from a long time ago. > > > > > > Is that the best way to let the stuff in my home to have valid dns > entries > > > in my home network? > > > > > > How difficult is it to get the OpenBSD provided dhcpd and unbound to do > > > this? > > > > > > Thanks. > > > > > > > > > -- > > David J. Raymond > > david.raym...@nmt.edu > > http://physics.nmt.edu/~raymond > > > >
