Create a cloudwatch alarm if my running count in ecs service is 0

Question

I have an ecs cluster with fargate as launch type and one service which has desired count as 1.

In somecase all my task may stop and there may a bug in the last updated code  , hence the task will be created and deleted frequently. If this scenario happens I need to get notified. The desired count would be 1 , but the task keeps on deleting and creating as there may be any scenario that stops the container.

Answer

You can use the [Task state change events](https://docs.aws.amazon.com/AmazonECS/latest/developerguide/ecs_cwe_events.html#ecs_task_events) to send an alarm whenever the task changes its state to stopped.

You can use the AWS Event Bridge rule below:

```
{
  "source": ["aws.ecs"],
  "detail-type": ["ECS Task State Change"],
  "detail": {
    "lastStatus": ["STOPPED"]
    "clusterArn": ["$CLUSTER_ARN"]
  }
}
```

It will catch all stopped task events from the cluster provided. Please change the `$CLUSTER_ARN` with the respective cluster ARN.

I hope this helps you!

Create a cloudwatch alarm if my running count in ecs service is 0

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