version: '3.8'

services:
  bind9:
    build: .
    container_name: bind9-dns
    ports:
      - "53:53/udp"
      - "53:53/tcp"
    volumes:
      - bind9_data:/etc/bind:ro
      - bind9_cache:/var/named/data
    restart: unless-stopped
    cap_drop:
      - ALL
    cap_add:
      - NET_BIND_SERVICE

volumes:
  bind9_cache:
  bind9_data: