lxd/util/net.go
func NetworkInterfaceAddress() string {
	ifaces, err := net.Interfaces()
	if err != nil {
		return ""
	}
	for _, iface := range ifaces {
		if shared.IsLoopback(&iface) {
			continue
		}
		addrs, err := iface.Addrs()
		if err != nil {
			continue
		}
		if len(addrs) == 0 {
			continue
		}
		addr, ok := addrs[0].(*net.IPNet)
		if !ok {
			continue
		}
		return addr.IP.String()
	}
	return ""
}
func NetworkInterfaceAddress() string {
	ifaces, err := net.Interfaces()
	if err != nil {
		return ""
	}
	for _, iface := range ifaces {
		if shared.IsLoopback(&iface) {
			continue
		}
		addrs, err := iface.Addrs()
		if err != nil {
			continue
		}
		if len(addrs) == 0 {
			continue
		}
		addr, ok := addrs[0].(*net.IPNet)
		if !ok {
			continue
		}
		return addr.IP.String()
	}
	return ""
}
// NetworkInterfaceAddress returns the first non-loopback address of any of the
// system network interfaces.
//
// Return the empty string if none is found.