How to mount LVM partitions from rescue mode (Fedora/CentOS/RedHat)

Boot your rescue media.
Scan for volume groups:
# lvm vgscan -v

Activate all volume groups:
# lvm vgchange -a y

List logical volumes:
# lvm lvs –all

With this information, and the volumes activated, you should be able to mount the volumes:
# mount /dev/volumegroup/logicalvolume /mountpoint