RHEL 8 CentOS 8, Alma Linux 8, Rocky Linux 8 System Not Booting with RAID or on other servers/computers Solution for dracut and initramfs missing kernel modules

This seems to have changed for RHEL 8 where a normal dracut to update your initramfs creates a system that only boots for the running kernel.  For example if you have Kernel 5 and then chroot into a RHEL 8 variant which uses kernel 4.18, and run dracut, it seems that by default the system will be unbootable.

It is also the case that if you move your RAID array or drives to another server that it will be unbootable, because dracut seems to only include modules needed for the current running kernel or system.

Take an example screen below, you'll see the dracut without -N which means --no-hostonly, is small and unbootable at 27M, at least in the circumstances that I describe (this issue does not seem to impact new Debian based installs).

If you find that your system is unbootable after a migration or chroot install and have a small initramfs, it's worth a shot to rebuild it with -N.  Also consider that you should check and update the grub.cfg and /etc/fstab to make sure the correct UUIDs are used and present.

You'll see the second example with -N produces an 89M initramfs which is essentially a rescue image that contains all possible kernel modules, which means it supports all possible devices, which is what we want.  I don't see why it's important to save 62M of space at the expense of the OS being unbootable.



rhel, centos, alma, linux, rocky, booting, raid, servers, dracut, initramfs, kernel, modulesthis, update, creates, chroot, variant, default, unbootable, array, server, modules, ll, hostonly, debian, installs, migration, install, rebuild, grub, cfg, etc, fstab, uuids, produces, essentially, contains, supports, devices, expense, os,

Latest Articles

  • vi cannot copy and paste automatic visual mode solution
  • python3 error Ubuntu Linux error solution SyntaxError: invalid syntax line 12 pip{sys.version_info.major}
  • Could not read response to hello message from hook [ ! -f /usr/bin/snap ] || /usr/bin/snap advise-snap --from-apt 2>/dev/null || true: Connection reset by peer
  • -bash: expr: command not found Linux Debian Mint Ubuntu
  • How to remove metadata from pdf on Linux Ubuntu
  • How to install and configure haproxy on Linux Ubuntu Debian
  • Linux Ubuntu Mint Gnome keyboard Typing not working in certain application or window solution
  • talib/_ta_lib.c:747:10: fatal error: ta-lib/ta_defs.h: No such file or directory
  • How to install Windows or other OS and then bring to another computer by using a physical drive and Virtual Machine with QEMU
  • PXE-E23 Error BOOTx64.EFI GRUB booting is 0 bytes tftp pxe dhcp solution NBP filesize is 0 Bytes
  • vagrant install on Debian Mint Ubuntu Linux RHEL Quick Setup Guide Tutorial
  • RHEL 8 CentOS 8, Alma Linux 8, Rocky Linux 8 System Not Booting with RAID or on other servers/computers Solution for dracut and initramfs missing kernel modules
  • How to Upgrade to Debian 11 from Version 8,9,10
  • Ubuntu Linux Mint Debian Redhat Cannot View Files on Android iPhone USB File Transfer Not Working Solution
  • Virtualbox Best Networking Mode In Lab/Work Environment without using NAT Network or Bridged
  • debootstrap how to install Ubuntu, Mint, Debian install
  • Linux grub not using UUID for the root device instead it uses /dev/sda1 or other device name solution
  • How To Restore Partition Table on Running Linux Mint Ubuntu Debian Machine
  • Debian Ubuntu apt install stop daemon questions/accept the default action without prompting
  • iptables NAT how to enable PPTP in newer Debian/Ubuntu/Mint Kernels Linux