How to boot server with older kernel and set it as default

Identify the Linux Kernel installed on your server by executing following command in shell on file /boot/grub/grub.conf;

grep '^[[:space:]]*kernel' /boot/grub/grub.conf

To boot from old kernel which is 0 in /boot/grub/grub.conf, change the default value of old kernel to 1 in /boot/grub/grub.conf.

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