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.

 


Tags:

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

  • How To Stop DNSMasq from listening on all IPs/Interfaces and allow only localhost
  • du - VAS Billing Subscriptions Hack/Scam MLPremiumSub Invascom Astromart Issues Complaint
  • Docker Swarm vs Kubernetes Comparison Guide
  • When is it time to leave your VPS/VDS Cloud Hosting Provider?
  • 2024 Buyer's Guide: How to Choose and Buy the Best VPS/VDS for Your Needs - Tips and Strategies
  • Postfix / sendmail config for DKIM, SPF and DMARC Tutorial Guide E-mail Delivery for Hotmail.com Gmail.com and More HowTo
  • Install Grafana on Linux Debian Ubuntu Tutorial Guide
  • How To Completely Disable ufw in Linux Ubuntu Mint Debian
  • System has not been booted with systemd as init system (PID 1). Can't operate. Failed to talk to init daemon. Ubuntu Debian Linux Solution Cannot reboot
  • Mint Ubuntu Linux Gnome Showing Home Directory on Desktop instead of Desktop Directory
  • vi vim not doing code highlighting E319: Sorry, the command is not available in this version solution
  • Proxmox How To Rename Node Hostname Fix Solution
  • Linux how to get list of all timezones on system Ubuntu
  • Proxmox install issue cannot see the buttons or install wrong / bad resolution cannot see the entire screen problem solution
  • configure.ac:75: error: possibly undefined macro: AC_PROG_LIBTOOL If this token and others are legitimate, please use m4_pattern_allow. See the Autoconf documentation. solution
  • Can't exec "aclocal": No such file or directory at /usr/share/autoconf/Autom4te/FileUtils.pm line 326. autoreconf: failed to run aclocal: No such file or directory solution
  • /bin/sh: autoreconf: command not found solution
  • glib-2.0 required to compile QEMU solution
  • How To Upgrade Debian 8,9,10 to Debian 12 Bookworm
  • Linux dhcp dhclient Mint Redhat Ubuntu Debian How To Use Local Domain DNS Server Instead of ISPs