Release: Amazon EC2 on 2009-05-17

Release Notes>Amazon EC2>Release: Amazon EC2 on 2009 05 17
This release introduces Amazon CloudWatch, Auto Scaling, and Elastic Load Balancing.


Submitted By: Bruce@AWS
Release Date: May 18, 2009 12:00 AM GMT
Latest Version: 2009-04-04
Latest WSDL:
Created On: May 17, 2009 11:34 PM GMT
Last Updated: May 18, 2009 3:14 PM GMT

New Features

Auto Scaling Amazon EC2 now supports Auto Scaling. Auto Scaling allows you to automatically scale your Amazon EC2 capacity up or down according to conditions you define. With Auto Scaling, you can ensure that the number of Amazon EC2 instances you're using scales up seamlessly during demand spikes to maintain performance, and scales down automatically during demand lulls to minimize costs. Auto Scaling is particularly well suited for applications that experience hourly, daily, or weekly variability in usage. Auto Scaling is enabled by Amazon CloudWatch and available at no additional charge beyond Amazon CloudWatch fees.

For more information, refer to the Auto Scaling Developer Guide Product Page.

Elastic Load Balancing Amazon EC2 now supports Elastic Load Balancing. Elastic Load Balancing automatically distributes incoming application traffic across multiple Amazon EC2 instances. It enables you to achieve even greater fault tolerance in your applications, seamlessly providing the amount of load balancing capacity needed in response to incoming application traffic. Elastic Load Balancing detects unhealthy instances within a pool and automatically reroutes traffic to healthy instances until the unhealthy instances have been restored. Customers can enable Elastic Load Balancing within a single Availability Zone or across multiple zones for even more consistent application performance.

For more information, refer to the Elastic Load Balancing Developer Guide Product Page.

Amazon Cloudwatch Amazon EC2 now supports Amazon CloudWatch. Amazon CloudWatch is a web service that provides monitoring for AWS cloud resources, starting with Amazon EC2. It provides customers with visibility into resource utilization, operational performance, and overall demand patterns—including metrics such as CPU utilization, disk reads and writes, and network traffic. To use Amazon CloudWatch, simply select the Amazon EC2 instances that you'd like to monitor; within minutes, Amazon CloudWatch will begin aggregating and storing monitoring data that can be accessed using web service APIs or Command Line Tools.

For more information, refer to the Amazon Cloudwatch Developer Guide Product Page.

New Guides Amazon EC2 now consists of six guides:
  • Amazon Elastic Compute Cloud Getting Started Guide—Describes how to set up your environment and get started with Amazon EC2.
  • Amazon Elastic Compute Cloud Console and Command Line User Guide—Describes Amazon EC2 concepts and how to use Amazon EC2 with the AWS Management Console or the command line tools.
  • Amazon Elastic Compute Cloud Developer Guide—Describes Amazon EC2 concepts and how to use Amazon EC2 with the APIs.
  • Amazon Elastic Compute Cloud API Reference—Provides detailed information about the Amazon EC2 APIs.
  • Amazon Elastic Compute Cloud API Reference—Provides detailed information about the Amazon EC2 command line tools..
  • Amazon Elastic Compute Cloud Quick Reference Card—Provides a quick summary of the Amazon EC2 command line tools.


Known Issues

Windows Reserved Instances Reserved Instances are not currently available for Windows.
Windows AMI launch times Windows AMIs take longer to launch than Linux/UNIX instances due to larger AMI sizes and multiple reboots.
Windows AMI sizes Installing software on Windows AMIs can cause them to become large and easily reach the 10 GB limit. Before bundling, check the size of the C:\ volume.
Limitation on drive mapping There is currently no support for volume attachment to devices beyond /dev/sdp on instances running Linux/UNIX and xvdp on instances running Windows.
Security group limitation AuthorizeSecurityGroupIngress does not allow port ranges for group grants when using the command-line tools or the Query API. This is only supported through the SOAP API.
Instance limit New users are limited to a maximum of 20 concurrent instances, but many of our customers use hundreds or thousands of instances. If you need a higher limit, go to
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