我该如何做尺寸块“动态”？答案

【问题标题】：How can I do dimensions block "dynamic"?我该如何做尺寸块“动态”？
【发布时间】：2021-02-15 06:57:07
【问题描述】：

想知道如何使 dimensions 阻止 aws_cloudwatch_metric_alarm 资源“动态”。到目前为止，有一些我确定不会工作的代码......但我想问一下应该如何编写它来实现目标。

locals {
  backend_tg_name  = data.terraform_remote_state.network.outputs.backend_tg_name
  frontend_tg_name = data.terraform_remote_state.network.outputs.frontend_tg_name
  webadmin_tg_name = data.terraform_remote_state.network.outputs.webadmin_tg_name

  dimensions = [
    {
      LoadBalancer = data.terraform_remote_state.network.outputs.alb_suffix
      TargetGroup  = data.terraform_remote_state.network.outputs.backend_tg_suffix
    },
    {
      LoadBalancer = data.terraform_remote_state.network.outputs.alb_suffix
      TargetGroup  = data.terraform_remote_state.network.outputs.frontend_tg_name
    },
    {
      LoadBalancer = data.terraform_remote_state.network.outputs.alb_suffix
      TargetGroup  = data.terraform_remote_state.network.outputs.webadmin_tg_suffix
    }
  ]

}

resource "aws_cloudwatch_metric_alarm" "httpcode_target_5xx_count" {
  for_each = {
    backend_tg_name  = local.backend_tg_name
    frontend_tg_name = local.frontend_tg_name
    webadmin_tg_name = local.webadmin_tg_name
  }

  alarm_name          = format("ALB: High amount of 5XX errors on target group %s", each.value)
  comparison_operator = "GreaterThanThreshold"
  evaluation_periods  = var.tg_evaluation_periods
  metric_name         = "HTTP_Code_Target_5XX_Count"
  namespace           = "AWS/ApplicationELB"
  period              = var.tg_period
  statistic           = "Sum"
  threshold           = var.tg_5xx_threshhold
  alarm_description   = "Average API 5XX target group error code count is too high"
  alarm_actions       = aws_sns_topic.infra_monitoring.arn
  ok_actions          = aws_sns_topic.infra_monitoring.arn
  treat_missing_data  = "notBreaching"

  dimensions = {
    "LoadBalancer" = ???
    "TargetGroup"  = ???
  }
}

如何更改尺寸和/或本地块？我想迭代三次并为同一个 ALB 后面的三个不同目标组创建三个相同的警报。请帮忙。

【问题讨论】：

标签： terraform amazon-cloudwatch

【解决方案1】：

这似乎是有效的，希望它会有所帮助：

locals {
  alb_suffix = data.terraform_remote_state.network.outputs.alb_suffix
  tg_alarms = {
    "backend_tg" = {
      tg_name   = data.terraform_remote_state.network.outputs.backend_tg_name
      tg_suffix = data.terraform_remote_state.network.outputs.backend_tg_suffix
    },
    "frontend_tg" = {
      tg_name   = data.terraform_remote_state.network.outputs.frontend_tg_name
      tg_suffix = data.terraform_remote_state.network.outputs.frontend_tg_name
    },
    "webadmin_tg" = {
      tg_name   = data.terraform_remote_state.network.outputs.webadmin_tg_name
      tg_suffix = data.terraform_remote_state.network.outputs.webadmin_tg_suffix
    }
  }
}

resource "aws_cloudwatch_metric_alarm" "httpcode_target_5xx_count" {
  for_each = local.tg_alarms

  alarm_name          = format("ALB: High amount of 5XX errors on target group %s", each.value["tg_name"])
  comparison_operator = "GreaterThanThreshold"
  evaluation_periods  = var.tg_evaluation_periods
  datapoints_to_alarm = var.tg_datapoints_to_alarm
  metric_name         = "HTTPCode_Target_5XX_Count"
  namespace           = "AWS/ApplicationELB"
  period              = var.tg_period
  statistic           = "Sum"
  threshold           = var.tg_5xx_threshold
  alarm_description   = "Average API 5XX target group error code count is too high"
  alarm_actions       = [aws_sns_topic.infra_monitoring.arn]
  ok_actions          = [aws_sns_topic.infra_monitoring.arn]
  treat_missing_data  = "notBreaching"

  dimensions = {
    "LoadBalancer" = local.alb_suffix
    "TargetGroup"  = each.value["tg_suffix"]
  }
}

【讨论】：