Raise Cloudwatch Alarm if ECS Service status is "Stopped"

Question

Hi,
I need to raise a cloudwatch alarm if one of my ECS Service Status is turned to Stopped.
I tried RunningTaskCount but looks like it has dependency of Container Insights to be enabled. It's difficult to get that done.
Is there any way I can check the service status of ECS Service and raise alarm if it goes to "Stopped".
Thanks,
Abdi

Riku_Kobayashi · Accepted Answer

Hello.

Are all the containers in your ECS service set to "essential=true"?  
If so, EventBirdge will be able to catch an event when a container stops.  
https://repost.aws/articles/AR8VnJ5IN5R6i2GNYbLwEdxw/how-to-notify-by-email-when-the-exitcode-of-an-ecs-fargate-task-ends-with-a-value-other-than-0

The documentation also recommends setting an alarm on RunningTaskCount, which is included in the Container Insights metrics.  
Since it's difficult for you to use Container Insights, I think that if you can't use EventBridge, you would need to create a script using Lambda or something to periodically check the status of your ECS service.  
https://docs.aws.amazon.com/AmazonCloudWatch/latest/monitoring/Best_Practice_Recommended_Alarms_AWS_Services.html#ECS-ContainerInsights

SHAJAM · Answer

You can use EventBridge Rules to enable notification. Go to EventBridge > Rules New Rule.

For rule, use JSON event pattern
```
{
  "source": ["aws.ecs"],
  "detail-type": ["ECS Service Action"],
  "detail": {
    "eventType": ["SERVICE_TASK_STATE_CHANGE"],
    "lastStatus": ["STOPPED"]
  }
}
```

For target, use a SNS topic when the event is matched. A notification will be sent to SNS. You can either trigger a Lambda function or simply get an email notification.

Raise Cloudwatch Alarm if ECS Service status is "Stopped"

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