Fix Error when migrating CentOS 7 from vmware to Xen

/dev/centos/root does not exist after migrating CentOS7 from vmware to xcp-ng
Rebuilding initramfs in emergency mode(or go to the Rescue Mode ):
Then

1) List the initramfs images you have:
# ls -ltrh /boot/initramfs-*

2) Locate the kernel version you’re using and create a backup of it:
# cp -iv /boot/initramfs-3.10.0-862.el7.x86_64.img /boot/initramfs-3.10.0-862.el7.x86_64.img.back

3) Rebuild the kernel image for that specific kernel
# dracut -f

4) Select the new kernel image
# ls -ltrh /boot/initramfs-*

5) Specify the new kernel version (For Example):
# dracut -f /boot/initramfs-3.10.0-862.el7.x86_64.img 3.10.0-862.el7.x86_64

6) Go to the Grub config
# vi /boot/grub2/grub

7) Delete the old menuentry and make sure that the new menuentry is top of all

8) Generate a GRUB configuration file
# grub2-mkconfig

9) Reboot

10) Done.

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