docker-compose.yaml

version: "3.8"

services:
  sharpns:
    build:
      context: .
      dockerfile: Dockerfile
    networks:
      app-network:
        # Set fixed IP address for DNS server
        ipv4_address: "172.10.0.2"
  
  cli:
    image: penumbra23/yant-cli:1.1
    networks:
      - app-network
    # This command changes the github IP address and inserts the following record:
    # github.com    A   123.123.123.123
    command: ["sh", "-c", "sleep 1 && yant http --target sharpns/record -h \"Content-Type: application/json\" -m POST -b '{\"domain\": \"github.com\", \"ip\": \"123.123.123.123\", \"type\": \"A\"}'"]
    depends_on:
    - sharpns
  
  cli-tester:
    image: alpine
    # Set the DNS server to the sharpns one
    dns: 172.10.0.2
    networks:
      - app-network
    # Using nslookup, the IP address of github should resolve to 123.123.123.123 instead of the real address
    # while google.com should default to the fallback DNS server 8.8.8.8
    command: ["sh", "-c", "sleep 2 && nslookup github.com && nslookup google.com"]
    depends_on:
      - cli

networks:
  app-network:
    ipam:
      driver: default
      config:
        - subnet: "172.10.0.0/24"