This program acts as a DNS server that resolves A queries. It starts with a default IP address for every request but you can dynamically add other IP addresses using requests of type 23.
It is meant to be used for testing with split DNS resolving, like for instance
systemd-resolved
A typical use would be to create a dummy network interface, assign it an non
routable IP address and use resolvectl to instructs split DNS that on that
address there is a DNS server listening.
This functionality is implemented in
setup_dummy_interface.sh.
Further on, you can assign some domains for split DNS to resolve through this server:
sudo resolvectl domain dns-stub test.mydomain.comA helper script is also provided:
scripts/resolve_dns.shAfter that, start the server passing in the command line the IP address of the dummy interface and the address it should return in the DNS answers.
The run-with-minikube.sh script instructs it to return the address of a running minikube instance.
If the logging is set to level debug RUST_LOG=debug the program will save in
files all the requests and responses.
Normally Docker containers are assigned a dynamic address when they are started. Using this server you could add their IP address in the DNS server and resolve them via regular names.