aws-sdk-rubyを使用してspot instanceのpricing historyを取得

https://github.com/aws/aws-sdk-ruby

gem install aws-sdk

aws-sdk-rubyをインストールした上で、使用しているAWSのID情報を設定し

export AWS_ACCESS_KEY_ID='...'
export AWS_SECRET_ACCESS_KEY='...'
export AWS_REGION='ap-northeast-1'

以下のようなruby srouceを実行すると、spot instanceのpricing historyが取得出来ます。

#!/usr/bin/env ruby
require 'rubygems'
require 'aws-sdk'

ec2=AWS::EC2.new
resp = ec2.client.describe_spot_price_history(
    :instance_types => ['m1.small', 'm1.medium', 'm1.large', 'm1.xlarge'],
    :start_time => (Time.now - 60 * 60 * 24).iso8601, 
    :availability_zone => 'ap-northeast-1b')

resp.data[:spot_price_history_set].map{ |history| 
    if history[:product_description] == "Linux/UNIX"
        p history[:instance_type] + " => " + history[:spot_price] + " (" + history[:timestamp].to_s + ")" 
    end
}

実行結果。

"m1.small => 0.017000 (2013-08-01 22:52:34 UTC)"
"m1.large => 0.067000 (2013-08-01 22:48:47 UTC)"
"m1.medium => 0.035000 (2013-08-01 22:48:44 UTC)"
"m1.xlarge => 0.134000 (2013-08-01 22:48:43 UTC)"
"m1.small => 0.000100 (2013-08-01 22:47:34 UTC)"
"m1.xlarge => 0.134000 (2013-08-01 13:12:40 UTC)"
"m1.medium => 0.035000 (2013-08-01 06:47:28 UTC)"
"m1.small => 0.017000 (2013-08-01 02:42:36 UTC)"
"m1.large => 0.067000 (2013-08-01 00:04:50 UTC)"
"m1.xlarge => 0.134000 (2013-07-31 13:11:39 UTC)"
"m1.medium => 0.035000 (2013-07-31 06:44:00 UTC)"