Start EC2 instances event base.

Question

I would like to start an ec2 instance event base. Suppose instance is stopped and when someone trying to SSH/RDP or by running a python script, instance should start may be through lambda function or using event bridge.

Riku_Kobayashi · Answer

What about triggering the connection in the Systems Manager session manager to start Lambda?  
This would allow us to run Lambda and launch EC2 when Amazon EventBridge detects a session manager event.  
Below is an example of an Amazon EventBridge event pattern.

```
{
  "source": ["aws.ssm"],
  "detail-type": ["AWS API Call via CloudTrail"],
  "detail": {
    "eventSource": ["ssm.amazonaws.com"],
    "eventName": ["StartSession"],
    "requestParameters": {
      "target": ["EC2 ID"]
    }
  }
}
```

Another possibility would be to enable VPC flow logging and use CloudWatch Logs subscription filters to share logs to Lambda when there is an SSH connection.  
https://docs.aws.amazon.com/AmazonCloudWatch/latest/logs/SubscriptionFilters.html#LambdaFunctionExample

Please refer to the example in the following document for the Lambda function to be used for startup.  
https://repost.aws/knowledge-center/start-stop-lambda-eventbridge

Start EC2 instances event base.

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