CentOS - Nov 2011 - serial console oddities with CentOS Linux release 6.0 (Final)

It seems as if /etc/inittab has undergone some changes. That doesn't seem
to be related to my issues however. I am able to setup the grub.conf (
menu.lst if you like ) to use the serial console ttyS0 at 9600 baud and
the usual bits.

However I can not actually see the GRUB menu at boot time. I see nothing
until the server begins to boot and then I can see everything. However the
grub menu is absent entirely.

My config looks like so :

# grep -v "^#" /boot/grub/grub.conf
default=0
timeout=30
serial --unit=0 --speed=9600 --word=8 --parity=no --stop=1
terminal -timeout=30 serial console
title CentOS (2.6.32-71.el6.x86_64)
        root (hd0,0)
        kernel /vmlinuz-2.6.32-71.el6.x86_64 ro
root=UUID=2396ae8a-7eaa-4690-8701-10fb1b604e21 rd_NO_LUKS
rd_NO_LVM rd_NO_MD rd_NO_DM LANG=en_US.UTF-8
SYSFONT=latarcyrheb-sun16 KEYBOARDTYPE=pc KEYTABLE=us
crashkernel=auto rhgb console=tty0 console=ttyS0,9600n8
        initrd /initramfs-2.6.32-71.el6.x86_64.img


Everything runs fine, however the GRUB menu is no where to be seen at boot
time. Any ideas ?

Dennis



-- 
--
http://pgp.mit.edu:11371/pks/lookup?op=vindex&search=0x1D936C72FA35B44B
+-------------------------+-----------------------------------+
| Dennis Clarke           | Solaris and Linux and Open Source |
| dclarke at blastwave.org   | Respect for open standards.       |
+-------------------------+-----------------------------------+

On Sun, Nov 20, 2011 at 02:13:13PM -0500, Dennis Clarke
wrote:
> 
....
> However I can not actually see the GRUB menu at boot time. I see nothing
> until the server begins to boot and then I can see everything. However the
> grub menu is absent entirely.
> 
> My config looks like so :
> 
..
> serial --unit=0 --speed=9600 --word=8 --parity=no --stop=1
> terminal -timeout=30 serial console
put these two lines at the beginning and fix the --timeout typo :)

This config works for me:
<cut>
serial --unit=0 --speed=38400
terminal --timeout=10 serial console
default=0
timeout=5

title CentOS Linux (2.6.32-71.29.1.el6.x86_64)
        root (hd0,0)
        kernel /vmlinuz-2.6.32-71.29.1.el6.x86_64 ro
root=/dev/mapper/vg_c6-lv_root rd_LVM_LV=vg_c6/lv_root rd_LVM_LV=vg_c6/lv_swap
rd_NO_LUKS rd_NO_MD rd_NO_DM LANG=en_US.UTF-8 SYSFONT=latarcyrheb-sun16
KEYBOARDTYPE=pc KEYTABLE=us nomodeset crashkernel=auto rhgb quiet console=tty0
console=ttyS0,38400n
        initrd /initramfs-2.6.32-71.29.1.el6.x86_64.img
</cut>

Cheers,

Tru

-- 
Tru Huynh (mirrors, CentOS i386/x86_64 Package Maintenance)
http://pgp.mit.edu:11371/pks/lookup?op=get&search=0xBEFA581B
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On Sun, 20 Nov 2011, Dennis Clarke wrote:
> My config looks like so :
>
> # grep -v "^#" /boot/grub/grub.conf
> default=0
> timeout=30
> serial --unit=0 --speed=9600 --word=8 --parity=no --stop=1
> terminal -timeout=30 serial console
The "timeout" option needs a double-dash: "--timeout".
> title CentOS (2.6.32-71.el6.x86_64)
>        root (hd0,0)
>        kernel /vmlinuz-2.6.32-71.el6.x86_64 ro
> root=UUID=2396ae8a-7eaa-4690-8701-10fb1b604e21 rd_NO_LUKS
> rd_NO_LVM rd_NO_MD rd_NO_DM LANG=en_US.UTF-8
> SYSFONT=latarcyrheb-sun16 KEYBOARDTYPE=pc KEYTABLE=us
> crashkernel=auto rhgb console=tty0 console=ttyS0,9600n8
I've always edited out the "rhgb" option when I depend on a serial
console, but I honestly haven't checked whether it makes any 
difference in CentOS 6.0.

-- 
Paul Heinlein <> heinlein at madboa.com <> http://www.madboa.com/