EBS snapshot based on DeviceName

ebs_snapshot.sh

#!/bin/bash

# Requirements:
#   - awscli ( https://pypi.python.org/pypi/awscli )
#   - jq     ( http://stedolan.github.io/jq )
#   - curl
#   - configuring crendentials properly (see below)

# Invoke with devicename matching the EBS to be backed up (i.e. "/dev/sdm")
[ -z "$1" ] && { echo "Call me with the devicename of the EBS you want to back up!"; exit 1; }
#
device_name=$1

# Configure these properly
export AWS_ACCESS_KEY_ID=...
export AWS_SECRET_ACCESS_KEY=...
export AWS_DEFAULT_REGION=...

get_instance_id() {
  curl http://169.254.169.254/latest/meta-data/instance-id 2> /dev/null
}

get_vol_id() {
  local instance_id=$1
  local device_name=$2
  aws ec2 describe-instances --instance-ids $1 | \
    jq '.Reservations[0].Instances[0].BlockDeviceMappings | 
        map(select(.DeviceName == "'$2'")) | .[0] | .Ebs.VolumeId' | \
    tr -d \"
}

aws ec2 create-snapshot --volume-id $(get_vol_id `get_instance_id` $device_name)