如何将 aws_elastic_beanstalk_environment 设置传递给 Terraform 模块

Question

我正在使用 Terraform 模块来管理 AWS Elastic Beanstalk 应用程序和环境，并希望将环境变量列表传递给该模块。

由于缺乏更好的解决方案，我目前正在传递名称和值的平面列表，并声明固定数量的 setting 节（见下文）。这似乎行得通，除非当然有人要传递比我预期更多的环境变量。

那么 - 有没有更好的方法来实现这一点？

# file: main.tf
variable env_vars {
  default = ["FIRST_ENV_VAR", "1", "SECOND_ENV_VAR", "2"]
}

provider "aws" {
  region = "eu-central-1"
}

module "beanstalk-app" {
  source   = "./beanstalk"
  env_vars = "${var.env_vars}"
}

# file: beanstalk/main.tf
variable "env_vars" {
  type = "list"
}

resource "aws_elastic_beanstalk_application" "app" {
  name = "myapp"
}

resource "aws_elastic_beanstalk_environment" "env" {
  name                = "myapp-env"
  application         = "${aws_elastic_beanstalk_application.app.name}"
  solution_stack_name = "64bit Amazon Linux 2016.03 v2.1.3 running Tomcat 8 Java 8"

  setting {
    namespace = "aws:elasticbeanstalk:application:environment"
    name      = "${element(var.env_vars, 0)}"
    value     = "${element(var.env_vars, 1)}"
  }

  setting {
    namespace = "aws:elasticbeanstalk:application:environment"
    name      = "${element(var.env_vars, 2)}"
    value     = "${element(var.env_vars, 3)}"
  }

  setting {
    namespace = "aws:elasticbeanstalk:application:environment"
    name      = "${element(var.env_vars, 4)}"
    value     = "${element(var.env_vars, 5)}"
  }
}

Answer 1

在 HCL 中重复的对象块等价于一个列表（参见here .因此，您可以将变量（映射列表）传递给settings。

variable "settings" {
    type = "list"
    default = [
    {
      namespace = "aws:elasticbeanstalk:application:environment"
      name      = "FOO"
      value     = "BAR"
    },
    {
      namespace = "aws:elasticbeanstalk:application:environment"
      name      = "BAZ"
      value     = "HAZ"
    },
  ]
}

resource "aws_elastic_beanstalk_environment" "env" {
  name                = "myapp-env"
   application         = "${aws_elastic_beanstalk_application.app.name}"
  solution_stack_name = "64bit Amazon Linux 2016.03 v2.1.3 running Tomcat 8 Java 8"
  setting = ["${var.settings}"]
}