While installing centos 7, You may encounter error like “Warning: /dev/root does not exist”.
*> dracut-initqueue: Warning: Could not boot
> dracut-initqueue: Warning: /dev/root does not exist*
To fix this, when the dracut shell becomes available, create a directory:
Mount different block devices until you have found the one that contains the ISO. Once you find the /dev/ for the USB (for instance, if your system reads it virtual cd drive as /dev/sr0), perform the command blkid on the device:
Reboot the server and when the installer menu is shown, press tab to edit the installation parameters
The line will look like
vmlinuz initrd=initrd.img inst.stage2=hd:LABEL=CentOS\x207\x20x86_64 quiet nomodeset
Delete the label part and add the drive like the one below
vmlinuz initrd=initrd.img inst.stage2=hd:/dev/sr0 nomodeset
In this server, /dev/sr0 holds the virtual cd rom. Remove quiet if not needed and add nomodeset for especially Intel AMT boards.