NAT小鸡用systemd 来更新 Cloudflare DDNS的ipv4

TinyServe

首先找到 RECORD_ID
登陆 https://dash.cloudflare.com 找到域名的 ZONE_ID 和 API_TOKEN
输入：

 curl -X GET "https://api.cloudflare.com/client/v4/zones/$ZONEID/dns_records" \
     -H "Authorization: Bearer $API_TOKEN" \
     -H "Content-Type: application/json"

创建脚本
vi /usr/local/bin/cloudflare_ddns.sh

#!/bin/bash

API_TOKEN="content of API_TOKEN"
ZONE_ID="content of ZONE_ID"
RECORD_ID="content of RECORD_ID"
RECORD_NAME=" content of RECORD_NAME"
 
# Telegram bot credentials
TELEGRAM_BOT_TOKEN=" content of  TELEGRAM_BOT_TOKEN"
TELEGRAM_CHAT_ID="content of TELEGRAM_CHAT_ID"

# Function to send Telegram message
send_telegram_message() {
    message="$1"
    curl -s -X POST "https://api.telegram.org/$TELEGRAM_BOT_TOKEN/sendMessage" \
         -d "chat_id=$TELEGRAM_CHAT_ID" \
         -d "text=$message" \
         -d "parse_mode=HTML"
}

# Get current public IP
CURRENT_IP=$(curl -s https://api.ipify.org)

# Get the current DNS record IP from Cloudflare
OLD_IP=$(curl -s -X GET "https://api.cloudflare.com/client/v4/zones/$ZONE_ID/dns_records/$RECORD_ID" \
     -H "Authorization: Bearer $API_TOKEN" \
     -H "Content-Type: application/json" \
     | jq -r '.result.content')

# Check if IP has changed
if [ "$CURRENT_IP" != "$OLD_IP" ]; then
    # Update DNS record with new IP
    RESULT=$(curl -s -X PUT "https://api.cloudflare.com/client/v4/zones/$ZONE_ID/dns_records/$RECORD_ID" \
         -H "Authorization: Bearer $API_TOKEN" \
         -H "Content-Type: application/json" \
         --data '{"type":"A","name":"'"$RECORD_NAME"'","content":"'"$CURRENT_IP"'","ttl":1,"proxied":false}')

    # Check if update was successful
    if [ "$(echo "$RESULT" | jq -r '.success')" = "true" ]; then
        echo "DNS record updated successfully."
        send_telegram_message "<b>DNS record updated:</b> $RECORD_NAME now points to $CURRENT_IP"
    else
        echo "Error updating DNS record:"
        echo "$RESULT"
        send_telegram_message "<b>Error updating DNS record:</b> $RESULT"
    fi
fi

给权限 chmod +x /usr/local/bin/cloudflare_ddns.sh
安装 jq apt install jq

vi /etc/systemd/system/cloudflare-ddns.service

[Unit]
Description=Cloudflare Dynamic DNS Update
After=network-online.target
Wants=cloudflare-ddns.timer

[Service]
User=root
Type=oneshot
ExecStart=/usr/local/bin/cloudflare_ddns.sh
Restart=on-failure

[Install]
WantedBy=multi-user.target

vi /etc/systemd/system/cloudflare-ddns.timer

[Unit]
Description=Run cloudflare-ddns every 5 minutes

[Timer]
OnBootSec=1m
OnUnitActiveSec=5m

[Install]
WantedBy=timers.target

 sudo systemctl daemon-reload

sudo systemctl enable cloudflare-ddns
sudo systemctl start cloudflare-ddns

sudo systemctl enable cloudflare-ddns.timer
sudo systemctl start cloudflare-ddns.timer

查看日志：
sudo journalctl -u cloudflare-ddns.service --no-pager