如何实现AWS账户内EC2实例创建/终止时的邮件通知？

Got it, let's walk through exactly how to set up email notifications whenever an EC2 instance is created or terminated in your AWS account. It's a straightforward workflow using EventBridge (formerly CloudWatch Events) and SNS—here's the step-by-step breakdown that'll get you up and running in minutes:

First, we need a central topic where EventBridge will send state-change events, and which will forward those events to your email.

• Open the AWS Console, navigate to the SNS (Simple Notification Service) dashboard.
• From the left sidebar, select Topics, then click Create topic.
• Choose the Standard topic type (it's perfect for this use case—simpler than FIFO and supports email subscriptions).
• Give your topic a descriptive name like EC2-Instance-State-Alerts, and add an optional description (e.g., "Triggers emails when EC2 instances start or stop").
• Click Create topic, and save the topic's ARN (Amazon Resource Name) somewhere—you'll need it later.

Now we'll link your email address to the SNS topic so it receives notifications:

• On your newly created topic's detail page, switch to the Subscriptions tab and click Create subscription.
• For Protocol, select Email, then enter your full email address in the Endpoint field.
• Click Create subscription.
• Check your email inbox immediately—AWS will send a confirmation link. Click that link to verify your subscription; you won't get any notifications until you do this.

This is the "brain" of the setup—it watches for EC2 instance state changes and sends those events to your SNS topic.

• Open the AWS Console, navigate to EventBridge.
• From the left sidebar, select Rules, then click Create rule.
• Name your rule something like EC2-Create-Terminate-Notifications, add an optional description, then click Next.
• Under Define pattern, select Event pattern, then click Custom pattern (JSON).
• Paste this JSON pattern—it will only trigger when instances switch to running (created/started) or terminated states:

{
  "source": ["aws.ec2"],
  "detail-type": ["EC2 Instance State-change Notification"],
  "detail": {
    "state": ["running", "terminated"]
  }
}

• Click Next, then under Select targets, choose SNS topic from the target dropdown.
• Select the SNS topic you created earlier from the Topic menu.
• For Configure input, leave it set to Matched event—this ensures your email includes full details like instance ID, region, and timestamp.
• Click Next, skip adding tags (unless you need them for organization), then click Create rule.

To make sure everything works as expected:

• Head to the EC2 Console, launch a small test instance (use a t2.micro if you're on the free tier).
• Once the instance reaches the running state, check your email—you should get a notification with all the instance details.
• Terminate the test instance, and you'll get another notification when it moves to the terminated state.

• Permissions: Don't worry about manual IAM setup—when you create the EventBridge rule via the console, AWS automatically creates a role with permission to send events to your SNS topic.
• Multi-Region Support: EventBridge rules are region-specific. If you run EC2 instances in multiple regions, you'll need to repeat this setup in each region (or use EventBridge Global Endpoints for cross-region monitoring, but that's overkill for most use cases).
• Filtering Specific Instances: If you only want alerts for instances with certain tags (e.g., Environment:Production), you can add a tag filter to the EventBridge pattern. For example, add this inside the detail object:

  "tags": {
    "Environment": ["Production"]
  }
  

内容的提问来源于stack exchange，提问作者LogicIO