Your secure and private DNS server on Raspberry Pi!
This container implements dnscrypt-proxy. Just run this docker container on your Raspberry Pi.
docker run -dt -p 53:53/udp -p 53:53/tcp --name dnscrypt-proxy --restart unless-stopped imple/dnscrypt-proxy:latest
After the container is running, configure your operating system or router to use address of your RPi as a DNS server.
For those who do not know how to get docker on Raspberry Pi, here is very small manual.
$ curl -fsSL https://get.docker.com -o get-docker.sh
$ sudo sh ./get-docker.sh