Introducing instance maintenance policy for Amazon EC2 Auto Scaling
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The article introduces a new instance maintenance policy feature for Amazon EC2 Auto Scaling, allowing greater control over how instances are replaced and launched during replacement operations.
Specifically, the article covers:
- Background on Amazon EC2 Auto Scaling and instance replacement
- Overview of the instance maintenance policy, including MinHealthyPercentage and MaxHealthyPercentage settings
- How to configure the policy using the AWS Console, CLI, CloudFormation, or Terraform
- Using the "Launch before terminating" policy to increase application availability by launching new instances before terminating old ones
- Overriding the group policy during instance refresh operations, such as accelerating a deployment by setting MaxHealthyPercentage to 200%
- Using the "Terminate and launch" policy to control costs by terminating instances before launching new ones
- Setting custom policies for maximum flexibility
- How fractional instance calculations are handled
- Conclusion highlighting the benefits of instance maintenance policies
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