EC2 launch failure with ASGs

I have an EC2 launch-template that I can create individual instances from, but when I try to create then in an ASG they die as soon as created. is there a guild to trouble shooting, or at least getting more info as to why they are failing?

Typically a sign of a health check failure. You’re attaching them to a load balancer?

If they die in seconds, rather than 1-2 minutes, it’s also worth checking if you’re launching them with PIOPS. My recollection is that’s also the behaviour if you have hit your PIOPS or other EBS account limit.

Thanks all, it was that my custom KMS key lacked the “kms:GenerateDataKeyWithoutPlaintext” action for the autoscaling resource role