terraform multiple regions at once

plan.tf

# Configure the OpenStack Provider
# It will read info from env OS_xxx
provider "openstack" {
}

#
# BACKENDS
#
# Create one server per region
resource "openstack_compute_instance_v2" "servers" {
  name        = "${format("server-%s", element(var.regions, count.index))}"
  count       = "${length(var.regions)}"
  region      = "${element(var.regions, count.index)}"
  image_name  = "Debian 10"
  flavor_name = "c2-7"
  network { name = "Ext-Net" }
}

vars.tf

variable "regions" {
  default = [
    "UK1",
    "SGP1"
  ]
}