在 Terraform 中引用以变量命名的资源 [英] Referring to resources named with variables in Terraform

问题描述

我正在尝试在 Terraform 中创建一个模块，该模块可以使用不同的变量输入多次实例化.在模块中，当资源名称依赖于输入变量时，如何引用资源?我正在尝试通过括号语法 ("${aws_ecs_task_definition[var.name].arn}") 来实现，但我只是猜到了.

I'm trying to create a module in Terraform that can be instantiated multiple times with different variable inputs. Within the module, how do I reference resources when their names depend on an input variable? I'm trying to do it via the bracket syntax ("${aws_ecs_task_definition[var.name].arn}") but I just guessed at that.

(警告:我可能会以完全错误的方式处理这个问题)

(Caveat: I might be going about this in completely the wrong way)

这是我模块的(简化的)main.tf 文件:

Here's my module's (simplified) main.tf file:

variable "name" {}

resource "aws_ecs_service" "${var.name}" {
    name = "${var.name}_service"
    cluster = ""
    task_definition = "${aws_ecs_task_definition[var.name].arn}"
    desired_count = 1
}

resource "aws_ecs_task_definition" "${var.name}" {
    family = "ecs-family-${var.name}"
    container_definitions = "${template_file[var.name].rendered}"
}

resource "template_file" "${var.name}_task" {
    template = "${file("task-definition.json")}"

    vars {
        name = "${var.name}"
    }
}

我收到以下错误:

Error loading Terraform: Error downloading modules: module foo: Error loading .terraform/modules/af13a92c4edda294822b341862422ba5/main.tf: Error reading config for aws_ecs_service[${var.name}]: parse error: syntax error

推荐答案

我从根本上误解了模块的工作原理.

I was fundamentally misunderstanding how modules worked.

Terraform 不支持在资源名称中插值(参见 relevant issues)，但在我的情况下这并不重要，因为模块的每个实例的资源都是在实例的命名空间中.我担心资源名称冲突，但模块系统已经处理了.

Terraform does not support interpolation in resource names (see the relevant issues), but that doesn't matter in my case, because the resources of each instance of a module are in the instance's namespace. I was worried about resource names colliding, but the module system already handles that.

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