Release: Amazon EC2 on 2008-07-01

Release Notes>Amazon EC2>Release: Amazon EC2 on 2008 07 01
This release introduces unique SSH host key generation for Amazon EC2 public AMIs.


Submitted By: Bruce@AWS
Release Date: July 1, 2008 12:00 AM GMT
Latest Version: 2008-02-01
Latest WSDL:
Created On: July 1, 2008 9:15 PM GMT
Last Updated: July 1, 2008 10:16 PM GMT

New Features

Feature Description
Public AMI Unique SSH Host Keys Amazon EC2 public AMIs now generate unique SSH host keys each time you launch an instance. This enables you to get the host SSH keys from the console output and verify the host to which you are connecting. 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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