Terraform-將多個子網分配給EC2實例

Question

我有2個子網（每個可用區1個）

resource "aws_subnet" "infrastructure_services" {
  count                   = "${var.enable_infrastructure_services_subnet ? 2 : 0}"
  vpc_id                  = "${aws_vpc.this.id}"
  cidr_block              = "${cidrsubnet(var.cidr_block,5,count.index + 6)}"
  availability_zone       = "${element(var.availability_zones, count.index)}"
  map_public_ip_on_launch = false

  tags = "${
    merge( map("Name", format("%s %s %s", var.env_name, count.index == 0 ? "Infrastructure Services A" : "Infrastructure Services B", "Subnet")), 
    var.global_tags, 
    var.vpc_tags)}"
}

我想將這兩個子網添加到EC2實例：

resource "aws_instance" "this" {
  count                   = "${length(var.instance_names)}"
  ami                     = "${var.ami}"
  instance_type           = "${element(var.instance_type, count.index)}"
  availability_zone       = "${element(var.availability_zones, count.index)}"
  disable_api_termination = "${var.disable_api_termination}"
  key_name                = "${var.key_name}"
  ebs_optimized           = "${var.ebs_optimized}"
  subnet_id="${element(aws_subnet.infrastructure_services.id,count.index)}"

  vpc_security_group_ids=["${aws_security_group.infrastructure_services.id}"]

但得到：

aws_instance.this[0]: Resource 'aws_subnet.infrastructure_services' not found for variable 'aws_subnet.infrastructure_services.id'
* aws_instance.this[1]: Resource 'aws_subnet.infrastructure_services' not found for variable 'aws_subnet.infrastructure_services.id'

Answer 1

您缺少列表中的* splat運算符語法。 相反，您應該使用aws_subnet.infrastructure_services.*.id來引用資源列表。

因此，您的實例資源應如下所示：

resource "aws_instance" "this" {
  count                   = "${length(var.instance_names)}"
  ami                     = "${var.ami}"
  instance_type           = "${element(var.instance_type, count.index)}"
  availability_zone       = "${element(var.availability_zones, count.index)}"
  disable_api_termination = "${var.disable_api_termination}"
  key_name                = "${var.key_name}"
  ebs_optimized           = "${var.ebs_optimized}"
  subnet_id               = "${element(aws_subnet.infrastructure_services.*id, count.index)}"
  vpc_security_group_ids  = ["${aws_security_group.infrastructure_services.id}"]
}

可能還值得注意的是，除非您需要使用列表長度的模數循環遍歷列表，否則可以使用更簡單的list[index]語法而不是element(list, index]) ：

resource "aws_instance" "this" {
  count                   = "${length(var.instance_names)}"
  ami                     = "${var.ami}"
  instance_type           = "${var.instance_type[count.index]}"
  availability_zone       = "${var.availability_zones[count.index])}"
  disable_api_termination = "${var.disable_api_termination}"
  key_name                = "${var.key_name}"
  ebs_optimized           = "${var.ebs_optimized}"
  subnet_id               = "${aws_subnet.infrastructure_services.*id[count.index])}"
  vpc_security_group_ids  = ["${aws_security_group.infrastructure_services.id}"]
}