One of the common problems after boot from a cdrom is accessing the devices or processes that runs from the cd but inside the jail of the chroot. You can bind some already mounted system folders like /dev, inside our root partition.
Here's what I usually do:
Boot up from a rescue cd
Mount root partition to /mnt and boot partition into /mnt/boot.
mount --bind /proc /mnt/proc
mount --bind /sys /mnt/sys
mount --bind /dev /mnt/dev
chroot /mnt (you just went live on the system)
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