Re: How do I boot from different kernel when I don't have access to the console?

["prince" <prince@resoftcorp.com>]

Just to let you know, This is my /etc/grub.conf

% sudo cat /etc/grub.conf

# 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 (hd0,0)
#          kernel /vmlinuz-version ro root=/dev/hda3
#          initrd /initrd-version.img
#boot=/dev/sda
### BEGIN AUTOMAGIC KERNELS LIST
default=0
timeout=10
splashimage=(hd0,0)/grub/splash.xpm.gz

title Red Hat Linux (2.4.20-28.9BOOT)
        root (hd0,0)
        kernel /vmlinuz-2.4.20-28.9BOOT ro root=/dev/sda3
        initrd /initrd-2.4.20-28.9BOOT.img
title Red Hat Linux (2.4.20-28.9)
        root (hd0,0)
        kernel /vmlinuz-2.4.20-28.9 ro root=/dev/sda3
        initrd /initrd-2.4.20-28.9.img
=============================================================================
On Wed, 14 Jan 2004 12:08:51 -0800, prince wrote
> Recently I downloaded some kernel*.rpm (Linux i386) from 
> https://rhn.redhat.com/errata/RHSA-2003-417.html  and I installed 
> all the rpms using "rpm -iUvh kernel*.rpm". My mistake. I should 
> have used "rpm - Fvh". Now I do not know what kernel was there 
> previously. From the following output it looks, I had 2.4.20-18.9smp 
> earlier.
> 
> % ls -l /lib/modules/
> total 12
> drwxr-xr-x    3 root     root         4096 Jan  6 15:03 2.4.20-
> 18.9smp drwxr-xr-x    3 root     root         4096 Jan 12 16:01 
> 2.4.20-28.9 drwxr-xr-x    3 root     root         4096 Jan  6 15:02 
> 2.4.20-28.9BOOT
> 
> % rpm -qa | grep kernel
> kernel-pcmcia-cs-3.1.31-13
> kernel-2.4.20-28.9
> kernel-BOOT-2.4.20-28.9
> kernel-doc-2.4.20-28.9
> kernel-source-2.4.20-28.9
> 
> Now, whenever I boot the system it comes up with "2.4.20-28.9BOOT" 
> which doesn't have iptables module.
> 
> % lsmod
> Password:
> Module                  Size  Used by    Not tainted
> e1000                  54528   1 
> ext3                   61280   2 
> jbd                    46804   2  [ext3]
> 3w-xxxx                36192   3 
> sd_mod                 11916   6 
> scsi_mod               63416   2  [3w-xxxx sd_mod]
> 
> % uname -a
> 
> Linux dev9.my-comp.com 2.4.20-28.9BOOT #1 Thu Dec 18 13:27:13 EST 
> 2003 i686 i686 i386 GNU/Linux
> 
> I have ip tables in 2.4.20-28.9
> % ls -l /lib/modules/2.4.20-28.9/kernel/net/
> total 68
> drwxr-xr-x    2 root     root         4096 Jan  6 15:02 8021q
> drwxr-xr-x    2 root     root         4096 Jan  6 15:02 appletalk
> drwxr-xr-x    2 root     root         4096 Jan  6 15:02 atm
> drwxr-xr-x    2 root     root         4096 Jan  6 15:02 ax25
> drwxr-xr-x    4 root     root         4096 Jan  6 15:02 bluetooth
> drwxr-xr-x    2 root     root         4096 Jan  6 15:02 bridge
> drwxr-xr-x    2 root     root         4096 Jan  6 15:02 decnet
> drwxr-xr-x    3 root     root         4096 Jan  6 15:02 ipv4
> drwxr-xr-x    3 root     root         4096 Jan  6 15:02 ipv6
> drwxr-xr-x    2 root     root         4096 Jan  6 15:02 ipx
> drwxr-xr-x    5 root     root         4096 Jan  6 15:02 irda
> drwxr-xr-x    2 root     root         4096 Jan  6 15:02 netrom
> drwxr-xr-x    2 root     root         4096 Jan  6 15:02 rose
> drwxr-xr-x    2 root     root         4096 Jan  6 15:02 sched
> drwxr-xr-x    2 root     root         4096 Jan  6 15:02 sunrpc
> drwxr-xr-x    2 root     root         4096 Jan  6 15:02 tux
> drwxr-xr-x    2 root     root         4096 Jan  6 15:02 wanrouter
> 
> /lib/modules/2.4.20-28.9/kernel/net/ipv4/netfilter/ip_tables.o
> 
> But not under 2.4.20-28.9BOOT/ (there is no ipv?)
> % ls -l /lib/modules/2.4.20-28.9BOOT/kernel/net/
> total 24
> drwxr-xr-x    2 root     root         4096 Jan  6 15:02 8021q
> drwxr-xr-x    2 root     root         4096 Jan  6 15:02 ax25
> drwxr-xr-x    4 root     root         4096 Jan  6 15:02 bluetooth
> drwxr-xr-x    2 root     root         4096 Jan  6 15:02 netrom
> drwxr-xr-x    2 root     root         4096 Jan  6 15:02 rose
> drwxr-xr-x    2 root     root         4096 Jan  6 15:02 sunrpc
> 
> Now, I only have remote access to this server and I don't have 
> access to the console at this time. 
> 
> Is there a way, I can boot the system with "2.4.20-28.9" instead of 
> "2.4.20-
> 28.9BOOT". If the system does not come up properly, I should be able 
> to reboot with "2.4.20-28.9BOOT" which is working (but no iptables). 
> I have only remote power cycle capability.
> 
> Could you please suggest a way to get this done?
> 
> Note: This is follow-up to the question I earlier posted on 
> "iptables v1.2.7a: can't initialize iptables table `filter':"
> 
> thanks,
> Prince.