Oracle Cloud Infrastructure instance with Terraform cloud-init user_data

oci-linux-instance-cloud-init.tf

data "template_file" "cloud-config" {
  template = <<YAML
#cloud-config
runcmd:
 - echo 'This instance was provisioned by Terraform.' >> /etc/motd
YAML
}

resource "oci_core_instance" "example" {
  count               = 1
  compartment_id      = "${var.compartment_ocid}"
  availability_domain = "${var.availability_domain}"
  subnet_id           = "${var.subnet_ocid}"
  display_name        = "example"
  image               = "${lookup(data.oci_core_images.image-list.images[0], "id")}"
  shape               = "VM.Standard1.1"

  metadata = {
    ssh_authorized_keys = "${file(var.ssh_public_key_file)}"
    user_data = "${base64encode(data.template_file.cloud-config.rendered)}"
  }
}