Ensure there is an Amazon CloudWatch alarm available in your AWS account that is triggered each time an AWS EC2 instance configuration and status change is made. This CloudWatch alarm must fire every time an AWS API call is performed to create, terminate, start, stop or reboot an EC2 instance.
This rule can help you with the following compliance standards:
For further details on compliance standards supported by Conformity, see here.
This rule can help you work with the AWS Well-Architected Framework.
This rule resolution is part of the Conformity Security & Compliance tool for AWS.
Using Amazon CloudWatch alarms to detect EC2 instance configuration and status changes will help you stay up-to-date on the resource availability, gain insights into auto-scaling lifecycle, mitigate downtime, prevent data loss or avoid unexpected charges on your AWS bill.
Note 1: For this rule Cloud Conformity assumes that the CloudTrail service is already enabled to stream event log data to CloudWatch within your AWS account, otherwise see this rule to enable AWS Cloudtrail – CloudWatch integration.
Note 2: You have also the option to implement this conformity rule with AWS CloudFormation. Download the required CloudFormation template from this URL and follow the AWS instructions available here.
Remediation / Resolution
Step 1: Create a Simple Notification Service (SNS) topic and the necessary subscription to send email notifications whenever the appropriate Amazon CloudWatch alarm is triggered.
Step 2: Create the necessary metric filter and the CloudWatch alarm that will fire and send email notifications whenever an AWS EC2 instance configuration/status will change.
- AWS Documentation
- Amazon CloudWatch Concepts
- Creating CloudWatch Alarms for CloudTrail Events
- Create a Topic
- Subscribe to a Topic
- Using an AWS CloudFormation Template to Create CloudWatch Alarms
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You are auditing:
EC2 Instance Changes Alarm
Risk level: Medium