userdataでmount

userdata

#!/bin/bash -ex
exec > >(tee /var/log/user-data.log|logger -t user-data -s 2>/dev/console) 2>&1

while [ ! -e /dev/sdb ]; do echo Waiting for Ephemeral Disk to attach; sleep 5; done
if ! `df | grep -q /media/ephemeral0` ; then
  mkfs.ext3 /dev/sdb
  mount -t ext3 /dev/sdb /media/ephemeral0
fi

# snip...