如何在terraform中的嵌套块内循环

Question

我无法理解如何为下面的资源创建循环。我需要基于嵌套在“dimentions”块中的变量“instance”创建多个资源。根据我阅读一些文档后的理解，我应该使用 for_each 参数，但是我似乎无法弄清楚。

resource "aws_cloudwatch_metric_alarm" "disk_percentage_low" {
  alarm_name                = "disk_percentage_low"
  comparison_operator       = "LessThanOrEqualToThreshold"
  evaluation_periods        = "1"
  metric_name               = "disk_used_percent"
  namespace                 = "AWS/CWAgent"
  period                    = "60"
  statistic                 = "Average"
  threshold                 = "20"
  alarm_description         = "This metric monitors ec2 disk utilization"
  actions_enabled           = "true" 
  alarm_actions             = [aws_sns_topic.disk_alarm.arn]
  insufficient_data_actions = []
 
  dynamic = "dimensions" {
    for_each = var.instance
    content { 
      instanceid   = var.instanceid
      instancetype = var.instancetype
      imageid      = var.imageid
      instance     = var.instance.value 
    }
  }  
 }

variable "instance" {
  type = list
  default = ["E:" , "D:"]
} 

 

我很确定我做错了，但我已经搞砸了几天，并尝试了一些不同的方法，但似乎都不起作用。任何帮助将不胜感激，谢谢。

Answer 1

您不能在 aws_cloudwatch_metric_alarm 的单个警报中使用多个维度。您的dimension 只能是：

  dimensions = 
      instanceid   = var.instanceid
      instancetype = var.instancetype
      imageid      = var.imageid
      instance     = var.instance[0]
    }

或

  dimensions = 
      instanceid   = var.instanceid
      instancetype = var.instancetype
      imageid      = var.imageid
      instance     = var.instance[1]
    }

如果您想为var.instance 中的两个值设置警报，您必须创建 *两个警报：

resource "aws_cloudwatch_metric_alarm" "disk_percentage_low" {

  for_each                  = toset(var.instance)

  alarm_name                = "disk_percentage_low"
  comparison_operator       = "LessThanOrEqualToThreshold"
  evaluation_periods        = "1"
  metric_name               = "disk_used_percent"
  namespace                 = "AWS/CWAgent"
  period                    = "60"
  statistic                 = "Average"
  threshold                 = "20"
  alarm_description         = "This metric monitors ec2 disk utilization"
  actions_enabled           = "true" 
  alarm_actions             = [aws_sns_topic.disk_alarm.arn]
  insufficient_data_actions = []
 
  dimensions = {
      instanceid   = var.instanceid
      instancetype = var.instancetype
      imageid      = var.imageid
      instance     = each.value
    } 
 }