Script to prepare an EBS volume for use. Formats with ext4 if needed and updates fstab. Intended to be run as part of EC2 user data startup.

prepare_ebs_volume.sh

    #!/usr/bin/env bash

    if [ ! $2 ]; then
      echo "Usage: $(basename $0) DEVICE MOUNT_POINT"
      echo
      echo "           DEVICE - The device location on the EC2 instance. (E.g. /dev/sdh)"
      echo "      MOUNT_POINT - The location you would like the EBS Volume mounted to. (E.g. /data)"
      exit
    fi

    set -e
    set -x

    DEVICE=$1
    MOUNT_POINT=$2

    DEVICE_FS_TYPE=`file -sL $DEVICE `

    if [[ $DEVICE_FS_TYPE == *"ext4"* ]]; then
      echo "Device formatted"
    else
      echo "Formatting $DEVICE with an Ext4 fs"
      mkfs.ext4 -q -F $DEVICE
      echo
    fi

    #Label the device
    echo "Labelling $DEVICE"
    e2label  $DEVICE $MOUNT_POINT
    echo

    #Backup fstab
    echo "Copying /etc/fstab to /etc/fstab.orig"
    cp /etc/fstab /etc/fstab.orig
    echo

    if [ ! -d "$MOUNT_POINT" ]; then mkdir -p $MOUNT_POINT; fi

    #Add new entry to fstab for the new device
    echo "Adding new fstab entry"
    echo "LABEL=$MOUNT_POINT     $MOUNT_POINT           ext4    defaults,nofail  2   2" >> /etc/fstab
    echo

    #Mount all devices
    echo "Mounting all devices"
    mount -a
    echo

    echo "Done"