Overview

A CloudWatch Alarm that triggers when changes are made to EC2 Instances.

Prerequisites: This Alarm requires CloudTrail enabled, with events sent to a CloudWatch Log Group. See Related Configuration Items for configuration to enable CloudTrail/CloudWatch, or enter the CloudWatch Log Group name under the Metric Filter Configuration section.

Configuration Templates

Items
3
Size
1.2 KB
Missing Parameters
AWSTemplateFormatVersion: '2010-09-09'
Description: ''
Resources:
  SnsTopic:
    Type: 'AWS::SNS::Topic'
    Properties:
      Subscription:
        - Endpoint: email@example.com
          Protocol: email
      TopicName: alarm-action
  CloudWatchAlarm:
    Type: 'AWS::CloudWatch::Alarm'
    Properties:
      AlarmName: ec2_changes
      AlarmDescription: A CloudWatch Alarm that triggers when changes are made to EC2 Instances.
      MetricName: EC2InstanceEventCount
      Namespace: CloudTrailMetrics
      Statistic: Sum
      Period: '300'
      EvaluationPeriods: '1'
      Threshold: '1'
      ComparisonOperator: GreaterThanOrEqualToThreshold
      AlarmActions:
        - Ref: SnsTopic
      TreatMissingData: notBreaching
  MetricFilter:
    Type: 'AWS::Logs::MetricFilter'
    Properties:
      LogGroupName: ''
      FilterPattern: >-
        { ($.eventName = RunInstances) || ($.eventName = RebootInstances) ||
        ($.eventName = StartInstances) || ($.eventName = StopInstances) ||
        ($.eventName = TerminateInstances) }
      MetricTransformations:
        - MetricValue: '1'
          MetricNamespace: CloudTrailMetrics
          MetricName: EC2InstanceEventCount
Parameters: {}
Metadata: {}
Conditions: {}

Actions



Configure Action

Metric Filter Configuration


Alarm Configuration

* Required field

Sources and Documentation

Configuration Source: AWS Documentation

Additional Documentation: