Regenerate initramfs in CentOS 7

If you change motherboard you may meet a boot issue like /dev/centos/root does not exist. Just follow the tips in CentOS wiki to rebuild initramfs and the issue should be resolved.

Procedure

mount /dev/sda1 /media/boot/
mount /dev/mapper/centos-root /media/sysimage
mount --bind /proc /media/sysimage/proc
mount --bind /dev /media/sysimage/dev
mount --bind /sys /media/sysimage/sys
mount --bind /media/boot /media/sysimage/boot
chroot /media/sysimage
# backup old initramfs image
drauct --kver 2.6.40-1.rc5.f20.x86_64 # kernel version

NOTICE

• Don’t rename initramfs file.
• Install xfsprogs for XFS filesystem & LVM2 for LVM partitions.
• Mount /boot first and bind mount to chroot folder(/media/sysimage/boot in sample)