docker-compose.yml

name: nanodns

services:
  dns:
    build: .
    environment:
      - DNS_PORT=10053
      # A Records (domain|ip[|ttl])
      - A_REC1=app.example.com|service:webapp
      - A_REC2=api.example.com|service:api|120
      - A_REC3=static.example.com|10.10.0.1|300
      
      # CNAME Records (domain|target[|ttl])
      - CNAME_REC1=www.example.com|app.example.com
      
      # MX Records (domain|priority|mailserver[|ttl])
      - MX_REC1=example.com|10|mail1.example.com
      - MX_REC2=example.com|20|mail2.example.com|3600
      
      # TXT Records (domain|"text value"[|ttl])
      - TXT_REC1=example.com|v=spf1 include:_spf.example.com ~all
      - TXT_REC2=_dmarc.example.com|v=DMARC1; p=reject; rua=mailto:dmarc@example.com|3600
      - TXT_REC3=_acme-challenge.example.com|validation-token-here|60
    ports:
      - "10053:10053/udp"
    networks:
      - app_network

  webapp:
    image: nginx
    networks:
      - app_network

  api:
    image: node
    networks:
      - app_network

networks:
  app_network:
    driver: bridge