如何在同一列表上迭代多个资源? [英] How to iterate multiple resources over the same list?

问题描述

此处是Terraform的新功能.我正在尝试使用Terraform创建多个项目(在Google Cloud中).问题是我必须执行多个资源才能完全建立一个项目.我尝试了count，但是如何使用count依次绑定多个资源?以下是每个项目需要执行的以下资源:

New to Terraform here. I'm trying to create multiple projects (in Google Cloud) using Terraform. The problem is I've to execute multiple resources to completely set up a project. I tried count, but how can I tie multiple resources sequentially using count? Here are the following resources I need to execute per project:

1. 使用resource "google_project"
创建项目
2. 使用resource "google_project_service"
启用API服务
3. 使用resource "google_compute_shared_vpc_service_project"将服务项目附加到宿主项目(我正在使用共享的VPC)

1. Create project using resource "google_project"
2. Enable API service using resource "google_project_service"
3. Attach the service project to a host project using resource "google_compute_shared_vpc_service_project" (I'm using shared VPC)

如果我要创建一个项目，则此方法有效.但是，如果我将一个项目列表作为输入传递，那么如何为该列表中的每个项目依次执行上述所有资源?

This works if I want to create a single project. But, if I pass a list of projects as input, how can I execute all the above resources for each project in that list sequentially?

例如.

输入

project_list=["proj-1","proj-2"]

依次执行以下操作:

resource "google-project" for "proj-1"
resource "google_project_service" for "proj-1"
resource "google_compute_shared_vpc_service_project" for "proj-1"

resource "google-project" for "proj-2"
resource "google_project_service" for "proj-2"
resource "google_compute_shared_vpc_service_project" for "proj-2"

我正在使用不支持for循环的Terraform版本0.11

I'm using Terraform version 0.11 which does not support for loops

推荐答案

在Terraform中，您可以使用count以及两个插值函数element()和length()来实现.

In Terraform, you can accomplish this using count and the two interpolation functions, element() and length().

首先，您将为模块提供一个输入变量:

First, you'll give your module an input variable:

variable "project_list" {
  type = "list"
}

然后，您将得到类似的内容:

Then, you'll have something like:

resource "google_project" {
  count = "${length(var.project_list)}"
  name  = "${element(var.project_list, count.index)}"
}

resource "google_project_service" {
  count = "${length(var.project_list)}"
  name  = "${element(var.project_list, count.index)}"
}

resource "google_compute_shared_vpc_service_project" {
  count = "${length(var.project_list)}"
  name  = "${element(var.project_list, count.index)}"
}

当然，您还将在这些资源声明中拥有其他配置.

And of course you'll have your other configuration in those resource declarations as well.

请注意，在平台启动和运行的第5章中对此模式进行了说明，并且还有其他示例在文档此处中使用count.index.

Note that this pattern is described in Terraform Up and Running, Chapter 5, and there are other examples of using count.index in the docs here.

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