|New API Version||With this release, Amazon EC2 has a new API version (2010-08-31). The WSDL is at http://ec2.amazonaws.com/doc/2010-08-31/AmazonEC2.wsdl.|
|Tags||Amazon EC2 now supports tags, which are metadata you can optionally assign to instances, images, and other EC2 resources.
There are also three new API actions for managing your EC2 tags:
For more information, see Using Tags in the Amazon Elastic Compute Cloud User Guide.
|Filters||Amazon EC2 now lets you use filters when you use many of the
For more information, see Listing and Filtering Your Resources in the Amazon Elastic Compute Cloud User Guide.
|Idempotentcy for RunInstances||Amazon EC2 now lets you ensure the idempotency of your
For more information, go to How to Ensure Idempotency in the Amazon Elastic Compute Cloud User Guide.
|ImportKeyPair||Amazon EC2 now lets you upload the public key from an RSA key pair that you create with a third-party tool. You can use the key pair in all Amazon EC2 Regions. You can import the key using either
For more information, go to:
|Current Limitations for Tags and Filters||You currently cannot tag the following resources:
You can currently filter your resources in the AWS Management Console by tag, but not by the other filters that are available to use with
|Current Limitations for Micro Instances||Following are current limitations of micro instances:
|Current Limitations for Cluster Compute Instances||Following are current limitations of cluster compute instances:
|Current Limitations for Cluster Placement Groups||Following are current limitations of cluster placement groups:
|Setting the TCP_MAXSEG Socket Option||The 2.6.18-164.15.1 kernel used in the CentOS 5.4 reference AMI (ami-7ea24a17) contains a known issue where setting the TCP_MAXSEG socket option on TCP sockets to certain values (known values include 1500) causes the kernel to generate TCP Segmentation Offload (TSO) packets of invalid size that are then dropped by the NIC driver, resulting in very low network throughput. Don't set this socket option and let the kernel handle segmentation and Path Maximum Transmission Unit (PMTU) discovery using the default settings.|
|Query Version of ModifyInstanceAttribute||The Query API ModifyInstanceAttribute request does not allow you to modify the block-device-mappings, and you can't modify the user-data attribute if it already contains data.|
|Paid AMIs Backed by Amazon EBS||Amazon EBS-backed AMIs are not currently supported by Amazon DevPay.|
|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 Amazon S3-backed 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 are limitations on devices available for storage attachment. For more information, go to How to Attach the Volume to an Instance in the Amazon Elastic Compute Cloud User Guide.|
|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 http://aws.amazon.com/contact-us/ec2-request.|