如何编写 terraform 代码来为过多的数据库连接创建 aws_cloudwatch_metric_alarm？

Posted 2023-03-24

【中文标题】如何编写 terraform 代码来为过多的数据库连接创建 aws_cloudwatch_metric_alarm？

【英文标题】：How do I write a terraform code to create an aws_cloudwatch_metric_alarm for too many db connections?

【发布时间】：2021-04-24 06:42:09

【问题描述】：

在 AWS CloudWatch 中，我可以创建一个警报，当我的数据库连接过多时会提醒我：

我已经使用 terraform 创建了另一个警报...

resource "aws_cloudwatch_metric_alarm" "cpu_utilization_too_high" 
  alarm_name          = "cpu_utilization_too_high"
  comparison_operator = "GreaterThanThreshold"
  evaluation_periods  = "1"
  metric_name         = "CPUUtilization"
  namespace           = "AWS/RDS"
  period              = "600"
  statistic           = "Average"
  threshold           = var.cpu_utilization_threshold
  alarm_description   = "Average database CPU utilization over last 10 minutes too high"
  alarm_actions       = [aws_sns_topic.topic.arn]
  ok_actions          = [aws_sns_topic.topic.arn]

  dimensions = 
    DBInstanceIdentifier = "$var.db_instance_id"
  

现在我想使用 terraform 创建一个警报，提醒我注意我的数据库连接，但我不知道将 metric_name 设置为什么...

  metric_name         = ???TooMuchConnectingtoDataBase???

我查看了 terraform 文档，但它没有记录 metric_name 的用途。 https://registry.terraform.io/providers/hashicorp/aws/latest/docs/resources/cloudwatch_metric_alarm

【参考方案1】：

根据doc，

resource "aws_cloudwatch_metric_alarm" "too_many_db_connections" 
  alarm_name          = "too_many_db_connections"
  comparison_operator = "GreaterThanThreshold"
  evaluation_periods  = "1"
  metric_name         = "DatabaseConnections"
  namespace           = "AWS/RDS"
  period              = "600"
  statistic           = "Average"
  threshold           = var.db_connection_threshold
  alarm_description   = "Average db connections over last 10 minutes is too high"
  alarm_actions       = [aws_sns_topic.topic.arn]
  ok_actions          = [aws_sns_topic.topic.arn]

  dimensions = 
    DBInstanceIdentifier = "$var.db_instance_id"