On a proxmox 4.x environnement, this script look for vm and mount their disk on a host mount point

mount-all-promox-thinlvm-disks.sh

#!/bin/bash
# On proxmox 4.x, with a thinlvm setup, mount all running vm disk

BASE=/mnt
LVM_BASE=/dev/pve

#VMS=$(pct list|grep "running"|cut -d' ' -f1)
VMS=$(pct list|grep -v "VMID"|cut -d' ' -f1)


for VMID in $VMS
do
    disk=$(pct config $VMID|grep "rootfs")

    d=$(echo \"$disk\"|sed -e 's/.*\(vm-.*\),.*/\1/')

    if [ ! -d $BASE/$d ]; then
        mkdir $BASE/$d
    fi

    if mount | grep $BASE/$d > /dev/null; then
        echo "!! $BASE/$d already mounted"
    else

        mount $LVM_BASE/$d $BASE/$d
        echo "OK Mount $LVM_BASE/$d on $BASE/$d"
    fi

done