"rawdns" is a DNS forwarder that allows for DNS requests to return the IP addresses of Docker containers directly.

For example, if one has a container named "app", then a request for "app.docker" would return the IP address of that container. Likewise, if the "app" container has a linked database container whose alias name is "db", then a request for "db.app.docker" would return the IP address of the linked database container.