Use public IP for default admin password

README.md

@@ -50,6 +50,17 @@ Access example:
 http://your-server-ip:8380
 ```
 
+### Admin login
+
+On first start the backend creates a default administrator account:
+
+- Username: `NodeProbe`
+- Password: `nodeprobe` followed by the last segment of your server's **public** IP address
+  (e.g. public IP `203.0.113.5` -> password `nodeprobe5`)
+
+If the server cannot determine its public IP, you can provide it via the `SERVER_IP`
+environment variable.
+
 ### Using the deploy script
 
 The repository provides a `deploy.sh` script for one‑click deployment or updates. The script automatically switches to its directory and can be executed from anywhere:

README.zh.md

@@ -49,6 +49,16 @@ docker compose up -d
 http://your-server-ip:8380
 ```
 
+### 管理员登录
+
+首次启动时后台会自动创建一个管理员账户：
+
+- 用户名：`NodeProbe`
+- 密码：`nodeprobe` 加上服务器**公网**IP 的最后一段  
+  （例如公网 IP `203.0.113.5` 对应密码 `nodeprobe5`）
+
+若服务无法自动获取公网 IP，可通过 `SERVER_IP` 环境变量手动指定。
+
 ### 使用部署脚本
 
 仓库自带 `deploy.sh`，可一键部署或更新。脚本会自动切换到自身目录，可在任意位置通过绝对路径执行：

backend/main.py

@@ -85,7 +85,12 @@ def short_ts(ts):
 @app.on_event("startup")
 def create_default_user():
     db = database.SessionLocal()
-    host_ip = os.environ.get("SERVER_IP") or socket.gethostbyname(socket.gethostname())
+    host_ip = os.environ.get("SERVER_IP")
+    if not host_ip:
+        try:
+            host_ip = requests.get("https://api.ipify.org", timeout=5).text.strip()
+        except Exception:
+            host_ip = socket.gethostbyname(socket.gethostname())
     try:
         user = db.query(models.User).first()
         if not user: