获取 AWS CloudWatch 警报的 terraform 参考答案

【问题标题】：getting terraform reference for AWS CloudWatch alarm获取 AWS CloudWatch 警报的 terraform 参考
【发布时间】：2020-03-11 02:06:16
【问题描述】：

以下 terraform 资源创建 AWS cloudwatch 警报，但仍处于“数据不足”状态。我相信这是由于我使用的一些维度名称（DevicePath、fstype）可能不正确。我知道名称 MountPath 和 InstanceID 是正确的，但无法验证其他两个（DevicePath、fstype）。 AWS 将这些维度分别称为路径、设备、fstype 和主机，但是找不到 terraform 所称的参考。

resource "aws_cloudwatch_metric_alarm" "Low_Disk_Space_For_root_drive" {
  alarm_name                = "Low_Disk_Space_For_root_drive"
  comparison_operator       = "GreaterThanOrEqualToThreshold"
  evaluation_periods        = "2"
  metric_name               = "disk_used_percent"
  namespace                 = "CWAgent"

  dimensions {
    MountPath = "/"
    DevicePath = "/dev/xvda2"
    fstype = "xfs"
    InstanceId = "i-xxxxxxxxxxxxxxxxx"

  }

  period                    = "60"
  statistics                = "Maximum"
  threshold                 = "90" 
  alarm_description         = "Disk usage for / is high"
  insufficient_data_actions = []
  actions_enabled           = true
  alarm_actions             = ["arn:aws:sns:xxxxxx"]
  ok_actions                = ["arn:aws:sns:xxxxxx"]
}

【问题讨论】：

标签： terraform amazon-cloudwatch-metrics cloudwatch-alarms

【解决方案1】：

将 TreatMissingData 添加到资源主体

resource "aws_cloudwatch_metric_alarm" "Low_Disk_Space_For_root_drive"{
  alarm_name                = "Low_Disk_Space_For_root_drive"
 comparison_operator       = "GreaterThanOrEqualToThreshold"
 evaluation_periods        = "2"
 metric_name               = "disk_used_percent"
 namespace                 = "CWAgent"

 dimensions {
   MountPath = "/"
   DevicePath = "/dev/xvda2"
   fstype = "xfs"
   InstanceId = "i-xxxxxxxxxxxxxxxxx"

  }

  period                    = "60"
  statistics                = "Maximum"
  threshold                 = "90" 
  alarm_description         = "Disk usage for / is high"
  insufficient_data_actions = []
  **TreatMissingData = "notBreaching"**
  actions_enabled           = true
  alarm_actions             = ["arn:aws:sns:xxxxxx"]
  ok_actions                = ["arn:aws:sns:xxxxxx"]
}

【讨论】：

【解决方案2】：

为了完成这项工作，您需要

将MountPath 更改为path
删除DevicePath，改为添加device
添加ImageID和InstanceType

查看下方更新后的dimensions 字段

（注意 - 用您自己的值替换这些值。您应该能够从 AWS 控制台上的 Cloudwatch Metrics CWAgent 部分看到它们）

resource "aws_cloudwatch_metric_alarm" "Low_Disk_Space_For_root_drive" {
  alarm_name                = "Low_Disk_Space_For_root_drive"
  comparison_operator       = "GreaterThanOrEqualToThreshold"
  evaluation_periods        = "2"
  metric_name               = "disk_used_percent"
  namespace                 = "CWAgent"

  dimensions {
      InstanceId    = "i-xxxxxxxxxxxxxxxxx"
      ImageId       = "your-image-id"
      InstanceType  = "your-instance-type"
      path          = "/"
      device        = "your-device"
      fstype        = "xfs"

  }

  period                    = "60"
  statistics                = "Maximum"
  threshold                 = "90" 
  alarm_description         = "Disk usage for / is high"
  insufficient_data_actions = []
  actions_enabled           = true
  alarm_actions             = ["arn:aws:sns:xxxxxx"]
  ok_actions                = ["arn:aws:sns:xxxxxx"]
}

【讨论】：

【解决方案3】：

主要原因是因为你把什么作为设备

将“/dev/xvda2”更改为 AWS 的确切设备，例如 (“nvme1n1”)。您可以在 CloudWatch Metrics 中查看。

【讨论】：