mounter.sh

#!/bin/bash

# this script will run only once. it is to be placed in the /etc/init.d/ directory
# it will create an ebs volume and mount it
# add it to /etc/init.d/mounter
# and run sudo update-rc.d mounter defaults
# to make it run on boot

FLAG="/var/log/mounter.log"
if [ ! -f $FLAG ]; then

  DEVICE="/dev/xvdk"
  MOUNTPOINT="/data"
  SIZE="6000"
  IOPS="10000"
  EC2_INSTANCE_ID=`curl -s http://169.254.169.254/latest/meta-data/instance-id`
  EC2_AVAIL_ZONE=`curl -s http://169.254.169.254/latest/meta-data/placement/availability-zone`
  EC2_REGION="`echo \"$EC2_AVAIL_ZONE\" | sed -e 's:\([0-9][0-9]*\)[a-z]*\$:\\1:'`"
  echo "region=$EC2_REGION"
  echo "instance_id=$EC2_INSTANCE_ID"
  echo "avail_zone=$EC2_AVAIL_ZONE"

  # create a volume
  VOLUME_INFO=`aws ec2 create-volume --availability-zone $EC2_AVAIL_ZONE --region $EC2_REGION --volume-type io1 --size $SIZE --iops $IOPS --encrypted`
  echo "volume_info=$VOLUME_INFO"
  VOLUME_ID="`echo ${VOLUME_INFO} | grep -Po '(?= .VolumeId.:.)*vol-[a-z0-9]*[a-z0-9](?=")'`"
  echo "volume_id=$VOLUME_ID"

  # name our volume
  VOLUME_NAME="MongoData-`date +%F`"
  echo "volume_name=$VOLUME_NAME"
  aws ec2 create-tags --region $EC2_REGION --resources ${VOLUME_ID} --tags Key=Name,Value=${VOLUME_NAME}
  sleep 60 # wait for volume to become available

  # attach the volume to the current instan c
  aws ec2 attach-volume --region $EC2_REGION --volume-id ${VOLUME_ID} --instance-id ${EC2_INSTANCE_ID} --device $DEVICE

  # fomat and mount
  mkfs.ext4 $DEVICE
  mkdir -p $MOUNTPOINT
  mount $DEVICE $MOUNTPOINT
  echo "$DEVICE	$MOUNTPOINT	ext4	defaults,auto,noatime,noexec	0 0" >> /etc/fstab

  echo "/data should now be accessible"

  touch $FLAG
else
   echo "Go away"
fi