使用Terraform将ECS任务ARN注入AWS Cloudwatch事件规则

Question

我正在尝试创建一个AWS Cloudwatch事件规则，以在运行特定任务的容器成功完成运行时发送SNS电子邮件通知。 我已经遍历了Terraform文档，但是找不到一种动态注入taskArn的好方法：

resource "aws_cloudwatch_event_rule" "important-task-complete-rule" {
  name = "reporting-task-completed"
  description = "Notification for when an important task finishes running successfully."

  event_pattern = <<PATTERN
{
  "source": [
    "aws.ecs"
    ],
  "detail-type": [
    "ECS Task State Change"
    ],
  "detail": {

    "lastStatus": [
      "STOPPED"
    ],
"stoppedReason" : [
    "Essential container in task exited"
  ],
"containers": {
  "exitCode": [
        0
      ],
  "taskArn": "arn:aws:ecs:us-east-1:MY_ACCOUNT:task/MY_TASK_ID_THAT_I_WANT_TO_INJECT"
    }
}
}
PATTERN
}

例如，这里的文档示例提供了我上面使用的相同的硬编码<<PATTERN示例。

是否有一种模板文件方式可以动态插入我的ARN中，而无需对其进行硬编码？

Answer 1

正如@matt Schuchard所说，您是否使用terraform资源属性进行管理？ （顺便说一句，它不称为variables ）。

resource "aws_ecs_task_definition" "service" {
   ...
}

resource "aws_cloudwatch_event_rule" "important-task-complete-rule" {
  name = "reporting-task-completed"
  description = "Notification for when an important task finishes running successfully."

  event_pattern = <<PATTERN
{
  "source": [
    "aws.ecs"
    ],
  "detail-type": [
    "ECS Task State Change"
    ],
  "detail": {

    "lastStatus": [
      "STOPPED"
    ],
"stoppedReason" : [
    "Essential container in task exited"
  ],
"containers": {
  "exitCode": [
        0
      ],
  "taskArn": "${aws_ecs_task_definition.service.arn}"
    }
}
}
PATTERN
}