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【AWS】ECS Serviceの監視をCFnで設定する

Last updated at 2020-11-04Posted at 2020-11-04

ECS ServiceのCPU使用率とタスク数をCloudWatch Alarm・SNS・ChatBotを利用して監視したいと思います。
リソース構築にはCloudFormation(以下CFnと略)を使います。

前提

監視対象のECS Cluster・Serviceが既に構築済み
Container Insightsが有効になっている

要件

共通
- 正常(OK)・異常(ALARM)の通知
CPU使用率
- 80%を超過したら通知
タスク数
- 2個未満になったら通知

CFn

AWSTemplateFormatVersion: 2010-09-09

####################################################
# Parameters
####################################################

Parameters:
  # 監視対象のECS Cluster
  EcsClusterName:
    Type: String
  # 監視対象のECS Service
  EcsServiceName:
    Type: String

####################################################
# Resources
####################################################

Resources:
  SampleSNSTopic:
    Type: AWS::SNS::Topic
    Properties:
      Subscription:
        # 向き先をChatBotにする
        - Endpoint: https://global.sns-api.chatbot.amazonaws.com
          Protocol: HTTPS
      TopicName: sample

  CpuUtilizationAlarm:
    Type: AWS::CloudWatch::Alarm
    Properties:
      MetricName: CPUUtilization
      Namespace: AWS/ECS
      ComparisonOperator: GreaterThanOrEqualToThreshold
      EvaluationPeriods: 1
      Period: 60
      Statistic: Average
      Threshold: 80
      AlarmActions:
        - !Ref SampleSNSTopic
      AlarmDescription: CPU utilization is 80% or more
      Dimensions:
        - Name: ClusterName
          Value: !Ref EcsClusterName
        - Name: ServiceName
          Value: !Ref EcsServiceName
      OKActions:
        - !Ref SampleSNSTopic

  EcsTaskCountAlarm:
    Type: AWS::CloudWatch::Alarm
    Properties:
      MetricName: RunningTaskCount
      Namespace: ECS/ContainerInsights
      ComparisonOperator: LessThanThreshold
      EvaluationPeriods: 1
      Period: 60
      Statistic: Average
      Threshold: 2
      AlarmActions:
        - !Ref SampleSNSTopic
      AlarmDescription: Running task count is less than 2
      Dimensions:
        - Name: ClusterName
          Value: !Ref EcsClusterName
        - Name: ServiceName
          Value: !Ref EcsServiceName
      OKActions:
        - !Ref SampleSNSTopic

備考

上記のCFnは既存のChatBotを利用する想定なので、ChatBotのマネコンからSNSトピックの追加作業があります。
(ChatBotはCFnでも管理できます -> AWS::Chatbot::SlackChannelConfiguration - AWS CloudFormation)

Reference

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