服务器列表的 Cloudwatch 警报答案

【问题标题】：Cloudwatch alarm for list of servers服务器列表的 Cloudwatch 警报
【发布时间】：2021-04-09 20:33:15
【问题描述】：

我正在尝试在服务器列表中设置一些警报，我的服务器在本地定义如下：

  locals {
      my_list = [
        "server1",
        "server2"
      ]
    }

然后我将我的 cloudwatch 警报定义为：（这是一个这样的警报）

resource "aws_cloudwatch_metric_alarm" "ec2-high-cpu-warning" {
  for_each            = toset(local.my_list)
  alarm_name          = "ec2-high-cpu-warning-for-${each.key}"
  comparison_operator = "GreaterThanThreshold"
  evaluation_periods  = "1"
  metric_name         = "CPUUtilization"
  namespace           = "AWS/EC2"
  dimensions = {
    instanceid   = values(data.aws_instances.my_instances)[*].ids
    instancename = local.my_list
  }

  period                    = "60"
  statistic                 = "Average"
  threshold                 = "11"
  alarm_description         = "This warning is for high cpu utilization for ${each.key}"
  actions_enabled           = true
  alarm_actions             = [data.aws_sns_topic.my_sns.arn]
  insufficient_data_actions = []
  treat_missing_data        = "notBreaching"
}

我也这样定义数据源：

data "aws_instances" "my_instances" {

  for_each = toset(local.my_list)

  instance_tags = {
    Name = each.key
  }
}

现在当我运行 terraform plan 时出现错误：

| data.aws_instances.my_instances is object with 2 attributes

属性“dimensions”的值不合适：元素“instanceid”：字符串必填。

【问题讨论】：

您想为每个实例定义一个警报？那么在您的示例中，您将创建两个警报？
@marcin 我希望每个实例有多个不同的警报，例如 cpu、内存等，我只在此处发布了 cpu 警报。同样是的，在我上面的示例中，两个警报为每个实例创建了一个，正确。

标签： amazon-web-services terraform cloudwatch-alarms

【解决方案1】：

在你的for_each 中你应该使用data.aws_instance.my_instances：

resource "aws_cloudwatch_metric_alarm" "ec2-high-cpu-warning" {

  for_each            = data.aws_instance.my_instances
  
  alarm_name          = "ec2-high-cpu-warning-for-${each.key}"
  comparison_operator = "GreaterThanThreshold"
  evaluation_periods  = "1"
  metric_name         = "CPUUtilization"
  namespace           = "AWS/EC2"
  
  dimensions = {
    instanceid   = each.value.id
    instancename = each.key
  }

  period                    = "60"
  statistic                 = "Average"
  threshold                 = "11"
  alarm_description         = "This warning is for high cpu utilization for ${each.key}"
  actions_enabled           = true
  alarm_actions             = [data.aws_sns_topic.my_sns.arn]
  insufficient_data_actions = []
  treat_missing_data        = "notBreaching"
}

上面将为您的两个实例创建两个警报（每个实例一个警报），其中instancename 将是server1 或``server2`。

【讨论】：