Terraform: Allow local-exec to be fired 1x when using count > 1 with aws_instance

[johnt337]

When using a aws_instance block with a count set to greater than 0 and using a provisioner of local-exec, the command executes for each instance in count.

Is there a way to control the execution?

[johnt337]

Coming from an ansible approach to infrastructure management, having a concept similar to with_items would increase the flexibility of working with terraform for me.

https://github.com/hashicorp/terraform/issues/1604

[phinze]

Hi @johnt337 - you can do this will a null_resource:

resource "aws_instance" "foo" {
  count = 10
  # ...
}
resource "null_resource" "after-foo" {
  depends_on = ["aws_instance.foo"]
  provisioner "local-exec" {
    inline = "echo 'Instance Ids: ${join(",", aws_instance.foo.*.id)}'"
  }
}

Hope this helps! Let me know if you have any further questions on this.

[johnt337]

Sorry for the delay, was bogged down yesterday dealing with a prod issue.
This worked great. I had to swap "inline" for "command" but outside of that it ran as expected.

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