I ran this command on RHEL 6.3:
# mount /dev/cdrom /mnt
Everything is okay, but after a restart the mounted dir,
I don't know where is it going.
Because when you boot up, nothing is mounted yet and each filesystem must be mounted in turn. The list of filesystems that should be automatically mounted during boot is in
/etc/fstab so if you want your cdrom to be mounted automatically on each boot, you must add a line for it to that file.
Mount doesn't permanently mount the file. To do that, you must edit your
man fstab will give you all the documentation you need.
just add this entry to /etc/fstab file :
/dev/cdrom /mnt/cdrom iso9660 ro 0 0