gns3-server/gns3server/appliances/dns.gns3a

{
    "name": "DNS",
    "category": "guest",
    "description": "This appliance provides DNS using dnsmasq with the local domain set to \"lab\".",
    "vendor_name": "Ubuntu",
    "vendor_url": "https://www.ubuntu.com/",
    "product_name": "DNS",
    "registry_version": 3,
    "status": "stable",
    "maintainer": "Andras Dosztal",
    "maintainer_email": "developers@gns3.net",
    "usage": "You can add records by adding entries to the /etc/hosts file in the following format:\n%IP_ADDRESS% %HOSTNAME%.lab %HOSTNAME%\n\nExample:\n192.168.123.10 router1.lab router1",
    "symbol": "linux_guest.svg",
    "docker": {
        "adapters": 1,
        "image": "adosztal/dns:latest",
        "console_type": "telnet"
    }
}