CM4树莓派开机功能-1️⃣固定网卡

固定eth0网卡

#!/usr/bin/env python3
# 固定 eth0 IP 的简单脚本（基于 NetworkManager/nmcli）

import subprocess
import sys

# ===== 在这里改 IP / 网关 / DNS =====
STATIC_IP = "192.168.137.64/24"         # 要固定的 IP 和掩码
GATEWAY   = "192.168.137.1"             # 常见网关，可按实际改
DNS       = "114.114.114.114,8.8.8.8"   # DNS，可以填多个，用逗号分隔
IFACE     = "eth0"                      # 网卡名，默认 eth0
# ===================================

def run(cmd):
    print("执行：", " ".join(cmd))
    subprocess.check_call(cmd)

def get_conn_name(iface):
    # 通过 nmcli 找到跟 eth0 对应的连接名
    out = subprocess.check_output(
        ["nmcli", "-t", "-f", "NAME,DEVICE", "connection", "show"],
        text=True
    )
    for line in out.strip().splitlines():
        name, dev = line.split(":", 1)
        if dev == iface:
            return name
    return None

def main():
    # 先检查是否有 nmcli
    try:
        subprocess.check_call(
            ["nmcli", "--version"],
            stdout=subprocess.DEVNULL,
            stderr=subprocess.DEVNULL,
        )
    except Exception:
        print("错误：系统中没有 NetworkManager/nmcli，不能用这个脚本。")
        print("如果是别的网络管理方式（如 netplan / dhcpcd），需要用对应方法配置。")
        sys.exit(1)

    conn_name = get_conn_name(IFACE)
    if not conn_name:
        print(f"错误：找不到与 {IFACE} 绑定的网络连接，请确认网线已插好、网卡名正确。")
        sys.exit(1)

    print(f"找到连接：{conn_name} (设备 {IFACE})")

    # 设置静态 IP
    run([
        "nmcli", "connection", "modify", conn_name,
        "ipv4.addresses", STATIC_IP,
        "ipv4.gateway",   GATEWAY,
        "ipv4.dns",       DNS,
        "ipv4.method",    "manual"
    ])

    # 重启连接生效
    run(["nmcli", "connection", "down", conn_name])
    run(["nmcli", "connection", "up",   conn_name])

    print("✅ 已为", IFACE, "设置静态 IP：", STATIC_IP, "网关：", GATEWAY)

if __name__ == "__main__":
    main()