services:
- name: dns
  addr: :1053
  handler:
    type: dns
    metadata:
      # Unreachable upstream so the system-DNS fallback is bypassed.
      # The host mapper resolves mapped names before the exchanger is
      # reached; unmapped names must hit the exchanger and fail.
      dns: udp://127.0.0.1:1
      timeout: 2s
  listener:
    type: dns
  hosts: my-hosts

hosts:
- name: my-hosts
  mappings:
  - ip: 10.0.0.100
    hostname: mapped.example.com
  - ip: 192.168.1.200
    hostname: aaaa.mapped.example.com