Change management in Amazon EC2 - Amazon Elastic Compute Cloud
Services or capabilities described in Amazon Web Services documentation might vary by Region. To see the differences applicable to the China Regions, see Getting Started with Amazon Web Services in China.

Change management in Amazon EC2

After initial security baselines are applied to Amazon EC2 instances at launch, control ongoing Amazon EC2 changes to maintain the security of your virtual machines. Establish a change management process to authorize and incorporate changes to Amazon resources (such as security groups, route tables, and network ACLs) as well as to OS and application configurations (such as Windows or application patching, software upgrades, or configuration file updates).

Amazon provides several tools to help manage changes to Amazon resources, including Amazon CloudTrail, Amazon Config, Amazon CloudFormation, and Amazon Elastic Beanstalk, Amazon OpsWorks, and management packs for Systems Center Operations Manager and System Center Virtual Machine Manager. Note that Microsoft releases Windows patches every Tuesday (sometimes even daily) and Amazon updates all Windows AMIs managed by Amazon within five days after Microsoft releases a patch. Therefore it is important to continually patch all baseline AMIs, update Amazon CloudFormation templates and Auto Scaling group configurations with the latest AMI IDs, and implement tools to automate running instance patch management.

Microsoft provides several options for managing Windows OS and application changes. SCCM, for example, provides full lifecycle coverage of environment modifications. Select tools that address business requirements and control how changes will affect application SLAs, capacity, security, and disaster recovery procedures. Avoid manual changes and instead leverage automated configuration management software or command line tools such as the EC2 Run Command or Windows PowerShell to implement scripted, repeatable change processes. To assist with this requirement, use bastion hosts with enhanced logging for all interactions with your Windows instances to ensure that all events and tasks are automatically recorded.