count terraform

main.tf

resource "openstack_networking_port_v2" "port" {
 count = "${var.server_count}"
 name = "node-${count.index}-eth0"
...
}
resource "openstack_blockstorage_volume_v3" "volume" {
 count = "${var.server_count}"
 name = "volume-for-node-${count.index}"
...
}
resource "openstack_compute_instance_v2" "node" {
 count = "${var.server_count}"
 name = "node-${count.index}"
...
 network {
 port = "${openstack_networking_port_v2.port[count.index].id}"
 }
 block_device {
 uuid = "${openstack_blockstorage_volume_v3.volume[count.index].id}"
 ...
 }
...
}