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dynamic provisioner is one way, you could also just pass a script as user_data which would be another option

The issue here is that I need to interact with the salt master prior to launching the instance, because I require output from the Salt API to pass into the userdata

Alternative would be to have the cloud events ("hey, a machine was created!") be fed to the event bus, and have a reactor fire up saltify to have master ssh to the node and provision the minion that way

Yeah, I've got an ASG that's using that approach, but I'd like to avoid having to use an SQS queue for working with Pulumi creation events. I'll let you know what I come up with once it's ready.

ASG?

Auto-scaling Group

Ah, thanks