alexandremahdhaoui / betterdns

This service provides a REST API to control a dns server allowing services to register their ip and hostname to the nameserver autonomously.

betterdns

We would like to register new vms to the DNS as soon as they're up & running. To randomly assign any IPs to new vms/container or use DHCP.

The goal of this project is to achieve service discovery.

Issues:

• How do we unregister vms/containers that might shut down in a non-gracefully manner?
  • Use health checks.
  • Try to terminate non-healthy vms/containers.
  • Then unregister them from the DNS.

Repository structure

Path	Description
src/dns_manifest_parser	Parser for dns zone manifest.
src/dns_operator	Operator of the dns server. Highly decoupled into 3 internal services: controller.rs, runtime.rs & watcher.rs.
src/rest_api	REST API server.

TODO: Next steps

• Write tests.

Getting started

This binary will create 2 threads:

• One thread serving the REST API to {create,read,update,delete} records of the dns zone manifest.
• Another one will act as an operator, watching the dns zone manifest for change & updating the nameserver.
  • The operator is responsible for running the nameserver as a child process.

Endpoint	Method	Description
/	GET	get the whole dns manifest
/a	GET	get all A records.
/a/<name>	GET	get one A record by name.
/a	POST	create a new A record.
/a/<name>	PUT	update an A record by name.
/a/<name>	DELETE	delete an A record by name.

Installation

git clone https://gitlab.com/alexandre.mahdhaoui/betterdns
mv betterdns "$HOME"
"$HOME/betterdns/scripts/update.sh"

Please make sure to have a customized copy of Corefile, dns_manifest & Rocket.toml in the directory that runs betterdns.

If you want to secure your alpine with a firewall:

• https://wiki.alpinelinux.org/wiki/How-To_Alpine_Wall

Considerations

We will have a problem when we will try to authenticate/authorize clients. Indeed, we'll maybe try to use JWT tokens to authenticate new VM/container trying to register to the DNS.