CloudFlare DDns

Cloudflare DDNS written in go

How to use

0. Add domain record on Cloudflare web panel

The domain should be added manually before running this program
While adding domain, input a incorrect ip.(later you can check if this program updating your domain well or not)

1. Config file example

{
    "zones": "",
    "email": "",
    "apikey": "",

    "A": [
        "example.com",
        "4.example.com"
    ],
    "AAAA": [
        "example.com",
        "6.example.com"
    ],

    "subnet6": {
        "prefix": 64,
        "targets": [
            {
                "domain": "6.example.com",
                "suffix": "::1111:2222:3333:ffff/64"
            },
            {
                "domain": "66.example.com",
                "suffix": "::8888/16"
            }
        ]
    }
}

zones: your cloudflare domain zone id
email: your cloudflare account email
apikey: your cloudflare global api key

A: domain list to update A record to this machine
AAAA: domain list to update AAAA record to this machine

subnet6: (this is optional)
prefix: your ipv6 prefix length
targets: your other machines in your subnet to update
domain: domain to update AAAA record to your other machine
suffix: your other machine's ipv6 suffix

2. Executable arguments

• --conf Config file path, default value is ./config.json
• --log Log file path
• --onetime Run just once, suitable for Crontab.
• --usedns Use dns to get domain current recorded ip instead of Cloudflare api
• --nolog Do not log to any file, only log to console

3. Linux systemd service

Copy executable and config file to /opt/cfddns-go/

Create service file at /usr/lib/systemd/system with following content

[Unit]
Description=Cloudflare DDns go
After=network.target

[Service]
Type=simple
User=root
ExecStart=/opt/cfddns-go/cfddns-go --conf /opt/cfddns-go/config.json
Restart=always
RestartSec=3

[Install]
WantedBy=multi-user.target

Start and enable service

systemctl start cfddns-go
systemctl enable cfddns-go