[CentOS] Serial console

SilverTip257 silvertip257 at gmail.com
Mon Jan 21 15:19:11 UTC 2013


On Fri, Jan 18, 2013 at 8:09 PM, Tracy Reed <treed at ultraviolet.org> wrote:

> I am trying to get a CentOS 6.3 serial console to work with IPMI SOL. I
> think I
> have everything working but maybe the wrong baud rate on the getty:
>
>
Hi Tracy,

On a Dell PowerEdge 2950 I have CentOS 6.3 and Serial over LAN working.
I too had issues with a feedback loop where two items were fighting and
causing spontaneous invalid log ins.  Below is simply what I used - adjust
your baud rate to whatever you have chosen.

BIOS:
Set external connector to COM1
Set SoL to run on COM2
Set to 57600 with RTS/CTS flow control

CentOS:
~]# cat /etc/init/serial-ttyS1.conf
#  This service maintains a getty on /dev/ttyS1.start on stopped rc
RUNLEVEL=[2345]
#stop on starting runlevel [016]respawn
#exec /sbin/agetty -h -L ttyS1 57600 vt100
#

# ttyS1 - agetty
#
# This service maintains a agetty on ttyS1.

stop on runlevel [S016]
start on runlevel [23]

respawn
exec agetty -h -L -w /dev/ttyS1 57600 vt100


~]# initctl start serial-ttyS1


$ ipmitool -I lanplus -U root -H 10.0.0.14 sol activate
> Password:
> [SOL Session operational.  Use ~? for help]
> ����������
>
> 10.0.0.14 is the DRAC IP address of the CentOS 6.3 box. It accepts the
> password
> and connects me to the console but then when I type I get those funny
> characters. Somehow an agetty is already being run:
>
> root     46110     1  0 16:13 ttyS1    00:00:00 /sbin/agetty /dev/ttyS1
> 19200 vt100-nav
>
> Is udev starting this up for me somehow? It says 19200 when everything I
> have
> read says it should be 115200. How do I change this? Some docs say I should
> create my own /etc/init/serial-ttyS1.conf containing:
>
> # For IPMI serial console
> # ttyS1 - agetty
> #
> # This service maintains a agetty on ttyS1.
>
> stop on runlevel [S016]
> start on runlevel [23]
>
> respawn
> exec agetty -h -L -w /dev/ttyS1 115200 vt102
>
> but when I do that I end up with two gettys, presumably fighting over the
> serial port, and the original is apparently holding onto it because I still
> can't connect and get a login prompt.
>
> # ps -ef |grep agetty
> root     46110     1  0 16:13 ttyS1    00:00:00 /sbin/agetty /dev/ttyS1
> 19200 vt100-nav
> root     46118     1  0 16:13 ?        00:00:00 agetty -h -L -w /dev/ttyS1
> 115200 vt102
>
> What is the right way to set this up?
>
>
You are on the right track.

I managed to fix my setup by trial and error.  I stopped the serial getty
with initctl and started again a few moments later and my setup has been
behaving since.


> Thanks!
>
> --
> Tracy Reed
> _______________________________________________
> CentOS mailing list
> CentOS at centos.org
> http://lists.centos.org/mailman/listinfo/centos
>

-- 
---~~.~~---
Mike
//  SilverTip257  //



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