Release: Amazon EC2 on 2008-05-29

Release Notes>Amazon EC2>Release: Amazon EC2 on 2008 05 29
This release introduces support for two new High-CPU instance types.


Submitted By: Bruce@AWS
Release Date: May 29, 2008 12:00 AM GMT
Latest Version: 2008-02-01
Latest WSDL:
Created On: May 27, 2008 8:07 PM GMT
Last Updated: May 29, 2008 4:04 PM GMT

New Features

Feature Description
New Instance Types Amazon EC2 now provides two new High-CPU instance types: c1.medium and c1.xlarge. These instance types have a higher CPU to memory ratio and are designed for processing-intensive applications. For more information, refer to the Amazon Elastic Compute Cloud Developer Guide.

Known Issues

Issue Description
Paid AMIs do not support High-CPU instance types Paid AMIs do not currently work with High-CPU instance types. For more information about paid AMIs and High-CPU instance types, refer to the Amazon Elastic Compute Cloud Developer Guide.
Limitation of AuthorizeSecurityGroupIngress 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.
Elastic IP addresses and existing connections After a remap of an Elastic IP to an instance, some preexisting communications (to the old and now unmapped IP address) might continue to work for some time. Because of the behavior of some network devices, existing communications (defined as established source IP, destination IP, port combinations) might continue to utilize preexisting mappings until the devices refresh their caches. These connections are not reliable after the remap. You should reestablish all communications after you remap. We will work to purge all these caches much more quickly.
Instance type metadata not available in older AMIs.

The instance-type is only available as part of the instance metadata on instances that expose version 2007-09-28 of the instance metadata. Large and extra large instance types support this version. Small instances types (the original instance type) might not support this version yet, in which case the instance type of m1.small can be assumed. You can query supported versions using the following URL:

Instance limit New users are limited to a maximum of 20 concurrent instances. If you want to run more than 20 instances, please complete the Amazon EC2 instance request form and your use case and instance increase will be considered.
Creation of Paid AMIs is limited We are currently accepting only a limited number of partners who will be able to create Paid AMIs. Users interested in selling their Amazon EC2 AMIs through this program should send an e-mail to Please include your name, AWS account ID, company name, and a detailed description of your AMI.
Console output availability There were some reports of full console output not being available. Full console output is only guaranteed for instances that were rebooted after this feature was released.
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