you can send a mail to your mailbox
google Raspberry Pi mailip
such as http://elinux.org/RPi_Email_IP_On_Boot_Debian
for local network, there is no complicated steps to find the IP
just get the hardware address of your card and scan the network with nmap.
> -----原始邮件-----
> 发件人: "Florin Andrei" <florin@xxxxxxxxxxxxxxx>
> 发送时间: 2014-12-09 07:35:13 (星期二)
> 收件人: "CentOS mailing list" <centos@xxxxxxxxxx>
> 抄送:
> 主题: print something on console after boot
>
> CentOS 7
>
> How do I print something on the text-mode console right after the OS has
> finished booting?
>
> I've a virtual instance and I need to know its IP address after it has
> finished booting up, to know where to ssh into it. I've tried adding "ip
> -4 addr > /dev/tty0" to rc.local, but that obviously doesn't work,
> because the login prompt overwrites everything I do.
>
> --
> Florin Andrei
> http://florin.myip.org/
>
> _______________________________________________
> CentOS mailing list
> CentOS@xxxxxxxxxx
> http://lists.centos.org/mailman/listinfo/centos
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