How to troubleshoot RHEL9 Linux errors faced during the boot process without any Data loss

Troubleshoot Several RHEL9 Linux Boot Process errors –
We are going to Solve these Boot Errors
1. Not able to find kernel/vmlinuz file. Rhel8/9 You can use – Rescue Mode i-By using second kernel ii).By using the CD/USb drive
2. Not able to initialize/load initramfs kernel panic error. #dracut command although we can follow the same steps as kernel recovery file because installing the kernel file regenerates the initramfs image automatically.
3. Unable to mount /test filesystem + Ctrl+D error
4. we forget root Password – This is not a Hackinh RHEL9 its feature for administrator – Singal user mode
5. Not Able to load Grub Bootloader. It goes into the grub rescue mode

the objective is – We have to troubleshoot Without data loss in Minimum Down Time

when we press power button / Just click on start vm

Step-1. POST – Power On Self Test -Test its all attached and required hardware
Step-2. Load BIOS/UEFi- POST
Step-3. Load MBR(Master Boot Record)-512MB
Step-4. Load boot Loader ie Grub, LILO, Grub2 or in Windows winload.exe/ntldr.exe
Step-5. Load Kernel vmlinuz and its required driver by using initramfs.img
step-6. Start systemd Mount fstab file and Load Linux file System and target mode acc.

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