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Linux Serial Consoles for Servers and Clusters February 10, 2009

Posted by hasnain110 in Linux.
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The more Linux servers you’re responsible for, the more that serial consoles can save you money, space and headaches by easing remote administration duties.

Required: Serial/Console Cable

Bootloader Configuration: GRUB

GRUB is a flexible bootloader with excellent support for serial consoles.

Can be found under /etc/grub.conf

Listing 1. An Ordinary grub.conf File

# grub.conf generated by anaconda
#
# Note that you do not have to rerun grub
# after making changes to this file
# NOTICE:You have a /boot partition.
#        This means that all kernel
#        and initrd paths are relative
#        to /boot/, eg.
#        root (hd0,1)
#        kernel /vmlinuz-version ro root=/dev/hda6
#        initrd /initrd-version.img
#boot=/dev/hda
default=0
timeout=10
splashimage=(hd0,1)/grub/splash.xpm.gz
title Red Hat Linux (2.4.20-8)
        root (hd0,1)
        kernel /vmlinuz-2.4.20-8 ro root=LABEL=/
        initrd /initrd-2.4.20-8.img
You need to add this console=ttyS0,9600n8 right after LABEL=/

Listing 2. A grub.conf File That Supports Serial Console

#boot=/dev/hda
# Options added for serial console
serial  --unit=0 --speed=9600 \
        --word=8 --parity=no --stop=1
terminal --timeout=10 serial console
default=0
timeout=10
title Red Hat Linux (2.4.20-8)
        root (hd0,1)
        kernel /vmlinuz-2.4.20-8 ro \
                root=LABEL=/ console=ttyS0,9600n8 
        initrd /initrd-2.4.20-8.img
Next time you reboot the server with appropriate setting in windows Hyper terminal
 you should get the the console output… and you are done !!!
 And your done !!!
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