Fedora dracut in chroot environment

The following is the procedure to create new initframfs when the root filesystem has structural changes such as between LVM, MD or plain. 

• Chroot to the desired folder (.e.g. /mnt/temp)
  chroot /mnt/temp
• mount the system partitions /proc, /run, /dev, /sys
  mount -t proc proc /proc
mount -t tmpfs tmpfs /run
mount -t devtmpfs devtmpfs /dev
mount -t sysfs sysfs /sys
• mount the /boot and / partition
  mount -t ext4 /dev/sdb1 /boot
mount -t ext4 /dev/md0 /
• Create the udev/data folder to emulate the udev database
  cd /run
mkdir udev/data
• To include mdadm in Fedora dracut: add module mdraid found in /usr/lib/dracut/modules.d/
  dracut -v -f -a mdraid --mdadmconf /boot/initramfs-$(uname -r).img $(uname -r)