Shell Script to bring EC2 SpotInstance Prices to CloudWatch.

cloudwatch-spot-price-metrics.sh

#!/bin/bash
#
# The MIT License (MIT)
#
# Copyright (c) 2013 Mathias Leppich <mleppich@muhqu.de>
#
# Permission is hereby granted, free of charge, to any person obtaining a copy
# of this software and associated documentation files (the "Software"), to deal
# in the Software without restriction, including without limitation the rights
# to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
# copies of the Software, and to permit persons to whom the Software is
# furnished to do so, subject to the following conditions:
#
# The above copyright notice and this permission notice shall be included in
# all copies or substantial portions of the Software.
#
# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
# THE SOFTWARE.
#

set -e

INSTANCE_TYPES="m1.small m1.medium"

HISTORY_JSON="/tmp/cloudwatch-spot-price-history.json"
METRICS_JSON="/tmp/cloudwatch-spot-price-metrics.json"

which aws >/dev/null || {
  echo >&2 "'aws' not found: please install https://github.com/aws/aws-cli"
  exit 1
}

which jq >/dev/null || {
  echo >&2 "'jq' not found: please install http://stedolan.github.io/jq/"
  exit 1
}

aws ec2 describe-spot-price-history \
  --instance-types $INSTANCE_TYPES \
  --product-descriptions "Linux/UNIX" \
  --max-items 500 \
  > $HISTORY_JSON

cat $HISTORY_JSON | jq '
  [
    .SpotPriceHistory
    | sort_by(.Timestamp)
    | reverse
    | group_by(.AvailabilityZone, .InstanceType, .ProductDescription)
    | .[]
    | (.[0]
      | {
          MetricName: "SpotPrice", Unit: "Count",
          Dimensions: [
            {Name:"AvailabilityZone", Value: .AvailabilityZone},
            {Name:"InstanceType", Value: .InstanceType},
            {Name:"ProductDescription", Value: .ProductDescription}
          ],
          Value: (.SpotPrice|tonumber)
        }
      )
  ]' > $METRICS_JSON

aws cloudwatch put-metric-data \
  --namespace SpotPrice \
  --metric-data file://$METRICS_JSON