How to upgrade kernel version?

First you need to download the latest stable kernel.
You can check it at http://kernel.org/.
Download it :
root@server [~]# cd /usr/local/src/

root@server [~]# wget http://www.kernel.org/pub/linux/kernel/v2.6/
Select latest Kernel and download it

root@server [~]# tar –zxvf linux-2.6.28.tar.gz
root@server [~]#cd linux-2.6.28
root@server [~]# make clean
root@server [~]# make mrproper
root@server [~]# uname -r
root@server [~] # cp /boot/config-‘uname -r’ .config
root@server [~] # make oldconfig
root@server [~] # make menuconfig
root@server [~] # make
root@server [~] # make modules_install
root@server [~] # make install
root@server [~] # grubby –bootloader-probe
root@server [~] # pico /etc/grub.conf Change the default as per the entry for your new kernel.
root@server [~]# reboot

Some time after reboot server it won’t up and running with the new kennel due to that before rebooting server, make following

changes.

root@server [~]#grub

Above command will give you grub prompt.

grub > savedefault –default=0 –once

grub>quit

root@server [~]#reboot

If server is up and running after reboot you can set new kernel as default server in grub.conf file.

root@server [~]#pico /boot/grub/grub.conf

Set

default=1

to

default=0

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