[CentOS] 7.2 installer says "/dev/root does not exist"

Hi folks,

I have an existing CentOS 7.2 system, that I want to re-install. I copied /vmlinuz and /initrd.img into /boot, place my kickstart file into /boot, and created a grub2 menu entry for this, as follows:

menuentry "Install CentOS 7" { insmod gzio insmod part_gpt insmod xfs set root=(hd0,2) linux /vmlinuz console=tty0 console=ttyS1,115200 inst.ks=hd:/dev/sda2/ks.cfg initrd /initrd.img }

When I reboot and select this, the kernel boots, unpacks the initrd, and then exits with the warning "/dev/root" does not exist.

What am I doing wrong? I thought this would be enough to get the installer to run and re-install the system from my kickstart file.

Regards, Anand