It's an Alpine based distribution of dnsmasq in a Docker image that works on the Raspberry PI. It is only several MB in size. It is just an ENTRYPOINT to the dnsmasq binary.
This was inspired by https://github.com/andyshinn/docker-dnsmasq for x86.
It is usually a good idea to use a tag other than latest if you are using this image in a production setting.
unwritten/dnsmasq-arm32v6:latest: dnsmasq based on Alpine 3.6 for ARMv6 32bit
dnsmasq requires NET_ADMIN capabilities to run correctly. Start it with something like docker run -p 53:53/tcp -p 53:53/udp --cap-add=NET_ADMIN andyshinn/dnsmasq:2.75.
The configuration is all handled on the command line (no wrapper scripts here). The ENTRYPOINT is dnsmasq -k to keep it running in the foreground. If you wanted to send requests for an internal domain (such as Consul) you can forward the requests upstream using something like docker run -p 53:53/tcp -p 53:53/udp --cap-add=NET_ADMIN andyshinn/dnsmasq:2.75 -S /consul/10.17.0.2. This will send a request for redis.service.consul to 10.17.0.2
As this is a very barebones entrypoint with just enough to run in the foreground, there is no logging enabled by default. To send logging to stdout you can add --log-facility=- as an option.