Assure an ENA instance boots after a yum update

gistfile1.txt

tldr - remove microcode_ctl package - configure dracut to insure needed drivers are included for kernel/initrd updates

And exmaple - The Chef way:

################
1.) create a recipe with the following code:
################

if node['ec2']['instance_type'].include? ( "c5" || "f1" || "g3" || "h1" || "i3" || "m4.16xlarge" || "m5" || "p2" || "p3" || "r4" || "x1" )
  template '/etc/dracut.conf' do
    source 'dracut.conf.erb'
    owner 'root'
    group 'root'
    mode 0644
  end

  package 'microcode_ctl' do
    action :remove
  end
  
else
  puts "Standard instance flavor, skipping dracut customization."
end


################
2.) add a dracut.conf template for the recipe to use (dracut.conf.erb) and make sure it has the drivers your configuration uses:
################

# PUT YOUR CONFIG HERE OR IN separate files named *.conf
# in /etc/dracut.conf.d
# SEE man dracut.conf(5)

# Sample dracut config file

#logfile=/var/log/dracut.log
#fileloglvl=6

# Exact list of dracut modules to use.  Modules not listed here are not going
# to be included.  If you only want to add some optional modules use
# add_dracutmodules option instead.
#dracutmodules+=""

# dracut modules to omit
#omit_dracutmodules+=""

# dracut modules to add to the default
#add_dracutmodules+=""

# additional kernel modules to the default
add_drivers+="nvme ext4"

# list of kernel filesystem modules to be included in the generic initramfs
filesystems+="ext4"

# build initrd only to boot current hardware
#hostonly="yes"
#

# install local /etc/mdadm.conf
#mdadmconf="no"

# install local /etc/lvm/lvm.conf
#lvmconf="no"

# A list of fsck tools to install. If it's not specified, module's hardcoded
# default is used, currently: "umount mount /sbin/fsck* xfs_db xfs_check
# xfs_repair e2fsck jfs_fsck reiserfsck btrfsck". The installation is
# opportunistic, so non-existing tools are just ignored.
#fscks=""

# inhibit installation of any fsck tools
#nofscks="yes"

# mount / and /usr read-only by default
#ro_mnt="no"

# set the directory for temporary files
# default: /var/tmp
#tmpdir=/tmp