Key Value Store DNS Server

This is a DNS Server that uses one of three Key Value Databases (Cassandra is a Column Database but we use it as if) as a DNS Resource Record Backend to answer queries.

This application uses Redis, Cassandra or Etcd to store the RRs in a distributed fashion. This allows us to have atomic updates for each record, easy RR distribution accross a datacenter or multiple datacenters and reliability.

TODO: DNSSec, Zone Transfer.

̀Disclaimer

Currently a Work in Progress. Intended as a research application.

System requirements

Since the application is meant to be backend distributed with a single entrypoint you need at least 3 machines.

On the main machine:

• Go 1.14
• Ansible >= 2.7 via python or package manager
• An SSH Key

On each machine:

• SSH-Server
• The following ports, which you can configure on the ansible inventory/group_vars
  • Redis: 7001,7002,7003,7004,7005,7006 and 17001,17002,17003,17004,17005,17006 since Redis uses "server port + 10" for intercluster gossip.
  • Cassandra: 7000, 9042, 9160
  • Etcd: 2380, 2379

Ansible will compile each database on the system checking for the system requirements.

Setup

First to set up the databases you need to have remote access to the remote machines and sudo access. The connection assumes the following:

• You have added your public key to the remote servers.
• The same user is present on every system.
• You have root privileges for each user.

Then you need to add your servers to the Ansible inventory. Go over to scripts/inventory/hosts and modify your IP addresses and ports if the default ports are already in use. Add the IP port:combination to the Makefile variables and the database name.

To Build

$ make build

To start the server

$ make run

Ansible will prompt you asking for the sudo password to install the db on the remote servers.

Utils

TODO