Question

我想看看是否有表达网络配置的语言。我可以使用M4和YAML对一些配置进行宏观操作，但是使用条件语句，它们似乎会崩溃。

有什么建议吗？

谢谢，尼尔

Answer 1

我的NCD programming language可能正是您所寻找的。

以下是使用DHCP配置有线网络接口的示例程序（与wiki相同）：

process lan {
    # Set device.
    var("eth0") dev;

    # Wait for device, set it up, and wait for network cable.
    net.backend.waitdevice(dev);
    net.up(dev);
    net.backend.waitlink(dev);

    # DHCP configuration.
    # net.ipv4.dhcp() will block here until it obtaines an IP address.
    # Note that it will only obtain the IP address, and *not* assign it;
    # we do that with a separate command below.
    net.ipv4.dhcp(dev) dhcp;

    # Check IP address - make sure it's not local.
    # If you have other reserved subnets around, check for those too.
    ip_in_network(dhcp.addr, "127.0.0.0", "8") test_local;
    ifnot(test_local);

    # Assign IP address, as obtained by DHCP.
    net.ipv4.addr(dev, dhcp.addr, dhcp.prefix);

    # Add default route, as obtained by DHCP.
    net.ipv4.route("0.0.0.0", "0", dhcp.gateway, "20", dev);

    # Configure DNS servers, as obtained by DHCP.
    net.dns(dhcp.dns_servers, "20");
}

请务必阅读整个NCD维基页面。 NCD的能力远远超过它最初的样子（例如，条件，循环，未知设备的动态配置......）。它甚至可以执行一些与网络无关的任务，例如报告输入设备（键盘，鼠标）事件。

表达网络配置的编程语言建议

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