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    # This is where we configure the instance with ansible-playbook
    provisioner "local-exec" {
        command = "sleep 120; ANSIBLE_HOST_KEY_CHECKING=False ansible-playbook -u ubuntu --private-key ./deployer.pem -i '${aws_instance.jenkins_master.public_ip},' master.yml"
    }

https://alex.dzyoba.com/blog/terraform-ansible/

provisioner "local-exec" {
    command = "ansible-playbook -i '${self.public_ip},' --private-key ${var.ssh_key_private} provision.yml"
}

  provisioner "local-exec" {
    command = "ansible-playbook -u fedora -i '${self.public_ip},' --private-key ${var.ssh_key_private} provision.yml" 
  }