How to Check and Configure Update Policies for AWS Auto Scaling Groups?

Question

Hello AWS Community,

I have been working on automating the provisioning and maintenance of AWS Service Catalog products using Azure DevOps pipelines. The pipeline is scheduled to run every 7 days to ensure our agents are always updated to the latest version.
The EC2 instances are part of an Auto Scaling Group (ASG), and I need to understand how the update process affects these instances.

I have reviewed the ASG details in the EC2 Management Console, but I couldn't find explicit settings for update policies. Any guidance on where to look and how to configure these settings would be greatly appreciated.

It seems I cannot find these details on either the ASG page or the Launch Template page

Thank you in advance for your assistance!

Shahad_C · Answer

Is this the UpdatePolicy you're referring to?: https://docs.aws.amazon.com/AWSCloudFormation/latest/UserGuide/aws-attribute-updatepolicy.html#cfn-attributes-updatepolicy-rollingupdate

If so, its not an ASG setting, it only applies to CFN (CloudFormation) based updates, and will trigger when a change is made during the stack update which means the instances are no longer current (ie, a new Launch Template version)

If your goal is to replace all instances when the pipeline triggers, then you can have the last step in the pipeline be to trigger an [Instance Refresh](https://docs.aws.amazon.com/autoscaling/ec2/userguide/asg-instance-refresh.html)

If you want to make sure all instances are periodically cycled out, you can instead use a [Max Instance Lifetime](https://docs.aws.amazon.com/autoscaling/ec2/userguide/asg-max-instance-lifetime.html)

How to Check and Configure Update Policies for AWS Auto Scaling Groups?

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