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

[Ted Kaczmarek <tedkaz@optonline.net>]

Your default=0, that will always boot the 2.4.20-28.9BOOT,
change it to 1 and it will boot the other version.
You can also pick the other one manually, but your timeout is only 10
seconds so pay attention :-) when booting.

Ted
On Wed, 2004-01-14 at 15:14, prince wrote:
> 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.
> 
> 
> 
> 
>