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Fix initramfs from broken update

Overview

I updated my CentOS 7 virtual guest and after boot it could not locate my partitions. I had actually 2 instances, an LVM guest and a non-LVM guest. LVM guest waited for a few minutes until it told me some errors about dracut. Non-LVM guest waited indefinitely for vda partition mount.

Solution

I booted the virtual instance with CentOS 7 ISO, selected rescue mode, let it mount existing system as read-write to /mnt/sysimage and chrooted to it.

While chrooted I rebuilt my initramfs with following command:

dracut -H -f /boot/initramfs-3.10.0-1127.8.2.el7.x86_64.img 3.10.0-1127.8.2.el7.x86_64 || dracut -fv --regenerate-all

Where 3.10.0-1127.8.2.el7.x86_64 is the kernel version, which you must check before issuing the command. Using uname is not recommended as you are doing this with a rescue kernel.

After that just sync and reboot. You may need to reboot twice.

Comments

All comments and corrections are welcome.

 stars  from 4 votes

Leave a comment

anonymous, 2019/10/21 05:30
This worked thanks! It just rebuilt something in the boot and rebooted itself first.
Pekka Kuronen, 2020/05/20 09:45
Happy to help
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