apt-get install aufs-tools
mount -t aufs -o cow,max_files=32768 -o allow_other,use_ino,suid,dev,nonempty ${PRIVATE_PATH}=RW:${TEMPLATE_PATH}=RO ${IMAGE_PATH}

apt-get install unionfs-fuse
unionfs-fuse -o cow,max_files=32768 -o allow_other,use_ino,suid,dev,nonempty ${PRIVATE_PATH}=RW:${TEMPLATE_PATH}=RO ${IMAGE_PATH}

mount | grep aufs | while read mount_line
do
    echo "${mount_line}"
    si="$(echo "${mount_line}" | sed -E 's>.*si=([^,)]*)[,)].*>\1>')"
    ls "/sys/fs/aufs/si_${si}" | while read file
    do
      printf "  %-10s : %s\n" "${file}" "$(cat "/sys/fs/aufs/si_${si}/${file}")"
    done
    echo
done

Példa kimenet:

none on / type aufs (rw,relatime,si=a4b833b2ae9dd3bc)
  br0        : /initrd/mnt/private=rw
  br1        : /initrd/mnt/root-ro=rr
  brid0      : 64
  brid1      : 65
  xi_path    : /initrd/mnt/private/.aufs.xino

none on /mnt/firmware type aufs (rw,relatime,si=a4b833b2a23563bc)
  br0        : /mnt/drbd/private/root=rw
  br1        : /mnt/firmware=rr
  brid0      : 64
  brid1      : 65
  xi_path    : /mnt/drbd/private/root/.aufs.xino

ps -C unionfs-fuse -o command=

Példa kimenet:

unionfs-fuse -o allow_other /mnt/81061142054995481601e7/local=RO /var/archives/20996373924899c4736c584
unionfs-fuse -o allow_other /mnt/56145475615464564874a4/local=RO /var/archives/464684546ab984646874b6a