将条件布尔值添加到Terraform脚本

时间:2019-09-19 10:50:26

标签: terraform terraform-provider-azure

我正在尝试添加一个名为“ DeployNSG”的变量作为true / false布尔值。当我使用'Count'在NSG的资源创建中引用变量时,然后我尝试将NSG与Azurerm_Network_security_group_association与子网关联,这就是说我需要在关联中使用count索引。并使用元素来引用项目,它表示如果子网关联中未使用count,则不能使用元素。


resource "azurerm_network_security_group" "ProdNSG" {
  count = "${var.DeployNSG ? 1 : 0}"
  name                = "${var.ProdNSG}"
  location            = "${var.location}"
  resource_group_name = "${azurerm_resource_group.ProdNetworkRG.name}"

  security_rule {
    name                       = "AllowRDP"
    priority                   = 100
    direction                  = "Inbound"
    access                     = "Allow"
    protocol                   = "Tcp"
    source_port_range          = "*"
    destination_port_range     = "3389"
    source_address_prefix      = "*"
    destination_address_prefix = "*"
  }
}

resource "azurerm_virtual_network" "ProdVNet" {
  name          = "${var.ProdVNet}"
  resource_group_name = "${azurerm_resource_group.ProdNetworkRG.name}"
  address_space = "${var.ProdVNetAddressSpace}"
  location      = "${var.location}"


}

resource "azurerm_subnet" "ServersSubnet" {
  resource_group_name = "${azurerm_resource_group.ProdNetworkRG.name}"
  name = "${var.ServersSubnet}"
  address_prefix = "${var.ServersSubnetAddressPrefix}"
  virtual_network_name = "${azurerm_virtual_network.ProdVNet.name}"

}

resource "azurerm_subnet_network_security_group_association" "ServersNSGAssociation" {
  subnet_id                 = "${azurerm_subnet.ServersSubnet.id}"
  network_security_group_id = "${azurerm_network_security_group.ProdNSG.id}"
}

如果我将关联注释掉,则真/假条件有效,因此,我认为这就是问题所在。

1 个答案:

答案 0 :(得分:0)

如果在某些情况下一个资源的count可能为零,那么在您引用该资源的任何其他位置,您必须告诉Terraform如何处理另一个对象不存在的情况。

在这种情况下,如果网络安全组不存在,您似乎根本不需要azurerm_subnet_network_security_group_association资源,因此最简单的答案是将相同的count应用于该资源其他资源:

resource "azurerm_network_security_group" "ProdNSG" {
  count = var.DeployNSG ? 1 : 0

  # ...other arguments as you already have set...
}

resource "azurerm_subnet_network_security_group_association" "ServersNSGAssociation" {
  # Create one of this resource only if there is one of the other resource.
  count = length(azurerm_network_security_group.ProdNSG)

  subnet_id                 = azurerm_subnet.ServersSubnet.id
  network_security_group_id = azurerm_network_security_group.ProdNSG[count.index].id
}

请注意,现在引用count.index时可以使用azurerm_network_security_group.ProdNSG,因为azurerm_subnet_network_security_group_association.ServersNSGAssociationcount具有相同的azurerm_network_security_group.ProdNSG值。存在一个NSG时,count.index将为0,因此它将选择第一个(也是唯一的)NSG实例。如果没有NSG,那么NSG附件也将不存在,因此count.index将永远不会得到评估。