[CentOS] is it possible to login to a switch via RS232 / serial port from the shell? - SOLVED

Rudi Ahlers Rudi at SoftDux.com
Mon Jun 23 10:26:22 UTC 2008

Tru Huynh wrote:
> Hi Rudi,
> 1) please TRIM the replies.
> 2) don't let people try to guess your setup
> - your initial email does not event state your CentOS version/arch
> - your should have told that you were using xen at the very beginning
> - post the relevant lines of /var/log/messages and/or the config files
>   of the program(s) you are using: it will avoid typos such as tty0/ttyS0 
> ...
> just like you did with: :D
>> [root at venus /]# grep tty /var/log/dmesg
>> Xen virtual console successfully installed as ttyS0
>> [root at venus /]# setserial /dev/ttyS0
>> Cannot get serial info: Invalid argument
>> [root at venus /]#
>> It may seem that Xen uses ttyS0 for itself, but how do I get around it?
> show the grub.conf entry of your kernels (dom0/domU) 
> and/or /proc/cmdline content.
> Tru
> ------------------------------------------------------------------------
> ______________________________________________

Hi Tru

Sorry for the inconvenience, since this is a CentOS list, I didn't think 
it's necessary to say I'm using CentOS. And to be honest with you, I 
didn't think there's a problem on the server, but more that I didn't 
know how to use minicom - which was the case.

Only after people recommended a few other things, did I think of Xen.

Anyway, it's working now. I had to change the Xen config in 
/boot/grub/menu and tell Xen not to use ttyS0 as a serial console for 


Kind Regards
Rudi Ahlers
CEO, SoftDux

Web:   http://www.SoftDux.com
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