Implementing Cloud Design Patterns for AWS（Second Edition）

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Placement groups

To further distribute your load across physical hardware, you can create a placement group. The following resource will cause your instance to be spread across underlying hardware:

resource "aws_placement_group" "web" {
  name = "book-pg"
  strategy = "spread"
}

Add the following to your instance resources to spread them across underlying hardware:

placement_group = "book-pg"

You could also use the cluster strategy to a create a low-latency instance group in a single AZ.