Great question! Let’s walk through what you can do here:

• Native Elastic Beanstalk support: As you’ve already discovered, Elastic Beanstalk’s official configuration options for Auto Scaling Groups don’t include a setting for termination policies. You won’t find this in the Beanstalk console options or in command-line/config file settings, so direct configuration through Beanstalk itself isn’t possible.

• Automated workarounds:

  1. Post-deployment scripts with AWS CLI: You can add a script in your .ebextensions directory that runs after your Beanstalk environment is created or updated. This script can use the AWS CLI to modify the ASG’s termination policy dynamically. For example:

     # Fetch the ASG name using Beanstalk environment tags
     ASG_NAME=$(aws autoscaling describe-auto-scaling-groups --filters "Name=tag:elasticbeanstalk:environment-name,Values=YOUR_ENV_NAME" --query "AutoScalingGroups[0].AutoScalingGroupName" --output text)
     # Update the termination policies
     aws autoscaling update-auto-scaling-group --auto-scaling-group-name $ASG_NAME --termination-policies "OldestInstance" "ClosestToNextInstanceHour"
     

     Just replace YOUR_ENV_NAME with your actual Beanstalk environment name, or adjust the tag filter to match your setup.
  2. CloudFormation integration: If you manage your Beanstalk environment via CloudFormation, you can define the Auto Scaling Group’s TerminationPolicies directly in your CloudFormation template. This way, the policy is set up automatically when the environment is provisioned, no manual steps needed.

• Manual approach (your current method): As you’re already doing, you can head to the EC2 Auto Scaling Groups console, locate the ASG linked to your Beanstalk environment, and edit the termination policies directly. This works for one-off changes but isn’t ideal if you need to replicate the setup across multiple environments or deployments.

It’s common for Beanstalk to abstract away some advanced infrastructure settings to keep things simple, so for these more specific ASG configurations, you’ll need to lean on AWS CLI/SDK or CloudFormation to fill the gap.

内容的提问来源于stack exchange，提问作者snetch