ASG - Terminate before Launch

Question

I have a ASG with a single instance. I use a ASG for the health checks to relaunch if there is an issue. Ideally I need the instance to be terminated before the replacement is launched.

Is there a way to achieve this?

Answer

It depends what you mean with launched. If you mean being brought into service you could probably use Lifecycle Hooks to keep the instance in Pending:wait state, checking the status of the terminating instance, before bringing the instance being launched into service.

https://docs.aws.amazon.com/autoscaling/ec2/userguide/lifecycle-hooks-overview.html

Answer

Would advise you look into using the right Instance Maintenance Policy for your use case and then depending on timing, consider the use of Lifecyle Hooks.
https://docs.aws.amazon.com/autoscaling/ec2/userguide/instance-maintenance-policy-overview-and-considerations.html

ASG - Terminate before Launch

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