Boot from one kernel to another kernel without reboot the system

Hi everyone,

Im a beginner in kernel related stuffs. I got two kernel in my system. both kernel r working fine so far.

But I would like switch from one working kernel to another kernel without rebooting my system. is there anybody here tell me how can I will able to do that?

thanks

Redwan

 

There used to be a mechanism called kexec am not sure if it is still maintained with the current kernels just google for kexec

 

hi,

thanks for reply... I have tried that command but when the new kernel start to boot, it suddenly get stuck at some point and generating the following error

No filesystem could mount root, tired: ext2 iso9660
kernel panic - not syncing: VFS: Unable to mount root fs on unknown-block(3,0)

do you have any idea about this?

Redwan

 

That is because you are not passing the correct root option to the kernel

 

Thanks a lot topdog.. finnaly I got able to switch another kernel..I used below command


kexec -l -t bzImage --command-line="ro root=/dev/VolGroup00/LogVol00" \
--initrd="/boot/initrd-2.6.24.3-custom_test.img" /boot/vmlinuz-2.6.24.3-custom_test

kexec -e

looking forward to future co-operation

regards

Redwan