Regenerate Initramfs File in Linux | Resolve Kernel Panic Error in Redhat Enterprise Linux

Kernel Panic Error Resolution in RHEL 7/8:
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1. See the details of Kernel Panic Error (Identify the reason behind it eg. New Kernel, Corrupted initramfs, New Packages after Patching, Hardware change etc.)
2. Login the system with root credentials through rescue mode.
3. Take necesarry action as the reason of getting this error.
If it is due to new kernel, then downgrade it.
If it is due to corrupted or missing initramfs, regenerate it.
4. In our case it is due to corrupted/absent initramfs file. First check your kernel version.
uname -r
5. Now regenerate initramfs with dracut or mkinitrd command: (here your kernel version should be same as in previous command result)
To create new initramfs use:
#dracut initramfs-3.10.0-1062.el7.x86_64.img 3.10.0-1062.el7.x86_64
OR
mkinitrd initramfs-3.10.0-1062.el7.x86_64.img 3.10.0-1062.el7.x86_64
To replace exsiting initramfs file use:
dracut -f initramfs-3.10.0-1062.el7.x86_64.img 3.10.0-1062.el7.x86_64
OR
mkinitrd --force initramfs-3.10.0-1062.el7.x86_64.img 3.10.0-1062.el7.x86_64
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#NehraClasses

[@vemagantianand1260]

Was very useful nehra sir got to know in simple steps

[@chinnakumar2623]

Awesome Explanation :) loved the presentation

[@michealobinna4285]

I think you did a great job in your presentation. Thank you so much.

[@sureshk12888]

Excellent presentation - keep up the good work

[@vishwaschaudhary4833]

Thank you sir for great explanation 👍 👏 👌 🙏

[@saisandy6301]

Thank you so much sir. These videos boot up my knowledge

[@kashefshaikh9666]

Do we have such videos if kernel itself corrup in Linux server, if it is there please give me link thanks

[@mahvishaman9402]

Thank you great explanation

[@saisandy6301]

Thank so much for sharing your knowledge

[@NehraClasses]

My pleasure!

[@PavanM-rm5yh]

Good explanation... Thanks alot

[@NehraClasses]

🙏

[@kashefshaikh9666]

Very good information thanks

[@NehraClasses]

You're welcome

[@MrPrabhu666]

Sir can you teach how to get in emergency mode please

[@tabbytabrez6767]

Sir how can we check if any module is creating the kernel panic error...lsmod will list all modules but which module is creating the error how to make sure...pls confirm

[@NehraClasses]

Please go through kernel panic logs

[@me_traveller7002]

Thanks a lot ..

[@pratikmuli9641]

In my case, normal user mode as well as rescue mode lands me to emergency shell, dracut/# terminal saying "1. Warning /dev/mapper/rhel-root does not exist 2. /dev/rhel/root does not exist 3. /dev/rhel/swap does not exist Gemerating" /run/initramfsm/rdsosreport.txt" Can you please help?!

[@ashishgupta3788]

Same here. Please advise

[@deepakpaul8453]

Thanks sir

[@rajeshchhetri-1875]

Help me I had a problem: kernel panic not syncing attempting to kill init exit code 0x00000100

[@NehraClasses]

For better support please join us on telegram.

[@Afro_Updates]

Top IT firm do ask this question during the first phone interview for devops cloud support

[@NehraClasses]

Yes

[@kasturisudarshan56]

Useful Info

[@NehraClasses]

Thanks

[@nareshshrivastava2286]

So nicely.

[@NehraClasses]

Thank you! 😊

[@hemanthkumar-xn5vu]

any idea about "failed to start login services" in rhel 7.6

[@balaji276]

For me also same problem brother. Do you get any solution

[@mohammedidris59]

Gud n excellent

[@NehraClasses]

Thanks

[@Abhishek-qg9fj]

Good information.....

[@NehraClasses]

Thanks 👍

[@siddharthkumar3772]

sir can you please explain how can I restore our initramfs and vmlinuz file through CD thankyou.

[@NehraClasses]

Videos already available in our RHCSA playlist

[@mithuparmar]

Super

[@NehraClasses]

Thanks

[@balaji276]

Thanks

[@NehraClasses]

Welcome

[@MohitGupta-iv3uc]

Sir what if initramfs image for resuce mode get deleted ?? . Does it follow vice-versa

[@NehraClasses]

In that case we use live iso image to boot up the machine to fix the issue

[@MohitGupta-iv3uc]

@@NehraClasses Thanks Sir

[@manjitkumar3242]

In MY case not working , can you please help

[@NehraClasses]

Please send me the error screenshots in our telegram channel 🙏

[@akshaybagde8462]

Why in Ubuntu it's almost impossible to resolve this kernel panic error

[@NehraClasses]

it is not like that, we can fix some kernel panic errors in ubuntu as well.

[@mishu002]

Ce Nu ai inteles? Iti mai sexplic o data

[@sreepaljsp]

i think, you have missed one step.. when you enter into rescue mode, system loads under "/mnt/sysimage" ... then you need to change it to root by giving "#chroot /mnt/sysimage"

[@NehraClasses]

I think you did watch it properly, I did it from the rescue kernel image, not from single user mode.

[@sreepaljsp]

@@NehraClasses rescue mode lands ur system into /mnt/sysimage

[@NehraClasses]

Rescue mode and rescue kernel both are different dear. The rescue mode is also referred to as the single-user mode. As the name suggests, the rescue mode is used when you want to salvage your system from a system failure, for example, boot failure or reset a password. In rescue mode, all the local filesystems are mounted. However, only salient services are started. Normal services such as network services will not be started. The rescue kernel is taking up space in /boot. A rescue kernel entry is created for every Kernel installation. A rescue kernel is marked as default after a Kernel installation.

[@NehraClasses]

In this method you don't need to manually remount the system as rw and no need to do chrooting. This rescue kernel just work like the normal one, but it is used for troubleshooting purpose.

[@sreepaljsp]

@@NehraClasses thank you very much ..

[@subhashsingh8553]

Not working at all as per your steps