Cloud provider

provider "dns" {
  update {
    server        = "ns1.sdi.hdm-stuttgart.cloud"
    key_name      = "gxy.key."  # Corresponding to your group
    key_algorithm = "hmac-sha512"
    key_secret    = "gas4rFgjT..." # Please choose a more secure option 
                                   # e.g. an environment variable! 
  }
}

resource "dns_a_record_set" "helloRecord" {
  zone = "${var.dnsSubnetName}." # The dot matters!
  name = hcloud_server.helloServer.name
  addresses = [hcloud_server.helloServer.ipv4_address]
  ttl = 10
}