CentOS - Oct 2017 - Display IP addresses on the system console *before* the login prompt.

I have a bunch of VBox Linux VMs (CentOS 6/7, Debian7/8/9, Ubuntu
(14.0/16.04, Alpine) that get dynamic IPs.  To get their respecitive
IP addresses I have to login and run 'ip addr'

I would like such info to be displayed on the VM console *before* the
login prompt.  Ideally an ASCII log + info (see below sig line).
Thus, I can get the info from the VM console without having to login.

I read up on /etc/issue but adding "\4{eth0}" to the existing string
does not work.

TIA for solutions/pointers

-- Arun Khan

<console display>

 _               _
| |__   ___  ___| |_ _ __   __ _ _ __ ___   ___
| '_ \ / _ \/ __| __| '_ \ / _` | '_ ` _ \ / _ \
| | | | (_) \__ \ |_| | | | (_| | | | | | |  __/
|_| |_|\___/|___/\__|_| |_|\__,_|_| |_| |_|\___|

lo: 127.0.0.1
eth0: 10.1.1.122
kernel: 4.10.0-33-generic x86_64

login:

</console display>

What does 'man agetty' (or whatever you're using) on the OS in
question say?

Ubuntu 14.04 doesn't list "\4{<nic>}" as an option and it
doesn't work, 16.04 does and it does appear there (might have to press Enter
to get a screen refresh).

If the OS doesn't support it then you'll have to get creative (send
'ip addr' output to /etc/issue at boot or periodically) to get what you
want.

----- Original Message -----
From: "Arun Khan" <knura9 at gmail.com>
To: "centos" <centos at centos.org>
Sent: Monday, October 2, 2017 3:03:00 PM
Subject: [CentOS] Display IP addresses on the system console *before*
the????????login prompt.

I have a bunch of VBox Linux VMs (CentOS 6/7, Debian7/8/9, Ubuntu
(14.0/16.04, Alpine) that get dynamic IPs. ?To get their respecitive
IP addresses I have to login and run 'ip addr'

I would like such info to be displayed on the VM console *before* the
login prompt. ?Ideally an ASCII log + info (see below sig line).
Thus, I can get the info from the VM console without having to login.

I read up on /etc/issue but adding "\4{eth0}" to the existing string
does not work.

TIA for solutions/pointers

-- Arun Khan

<console display>

?_ ? ? ? ? ? ? ? _
| |__ ? ___ ?___| |_ _ __ ? __ _ _ __ ___ ? ___
| '_ \ / _ \/ __| __| '_ \ / _` | '_ ` _ \ / _ \
| | | | (_) \__ \ |_| | | | (_| | | | | | | ?__/
|_| |_|\___/|___/\__|_| |_|\__,_|_| |_| |_|\___|

lo: 127.0.0.1
eth0: 10.1.1.122
kernel: 4.10.0-33-generic x86_64

login:

</console display>
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El 2/10/17 a las 22:03, Arun Khan escribi?:
> I read up on /etc/issue but adding "\4{eth0}" to the existing
string
> does not work.
>
>
This works for me in CentOS 7 (in /etc/issue)

System IPv4: \4{ens33}

You must replace {ens33} with the nic name you want to show. Get it with 
ifconfig

On Mon, Oct 2, 2017 at 1:31 PM, Leroy Tennison <leroy at datavoiceint.com>
wrote:
> What does 'man agetty' (or whatever you're using) on the OS in
question say?
>
> Ubuntu 14.04 doesn't list "\4{<nic>}" as an option and
it doesn't work, 16.04 does and it does appear there (might have to press
Enter to get a screen refresh).
>
> If the OS doesn't support it then you'll have to get creative (send
'ip addr' output to /etc/issue at boot or periodically) to get what you
want.
>
You are right, Ubuntu 14.04 does not support it and that's where it
does *not* work.  I read the getty man page in CentOS 7/Ubuntu 16.04
and implemented in Ubuntu 14.04 duh.

-- Arun Khan

Jose Maria Terry Jimenez wrote:
> El 2/10/17 a las 22:03, Arun Khan escribi?:
>
>> I read up on /etc/issue but adding "\4{eth0}" to the existing
string
>> does not work.
>>
>>
> This works for me in CentOS 7 (in /etc/issue)
>
> System IPv4: \4{ens33}
>
> You must replace {ens33} with the nic name you want to show. Get it with
> ifconfig
>
That would be ip a

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