Can you please elaborate when we need to use iso image to boot any rhel server during server crash..?

Hi Rupali,

Actually booting from ISO is not the first step to take while troubleshooting servers down issue. Number of options can be tried before that -

1. Sometimes a simple reboot may resolve the issue.

2. You can try doing a "fastboot" for the server

3. Change the default kernel version to the older one or the last stable one

4. Now , in scenarios where someone removes a kernel related RPM / delete a file like grub.conf or initrd or any system dependent files , then the only solution is booting from iso .

I am attaching a really good comprehensive document that will guide you with boot process and related issues.