# Set up FireLens to send logs to CloudWatch Logs
<a name="deploy-container-insights-ECS-logs"></a>

FireLens for Amazon ECS enables you to use task definition parameters to route logs to Amazon CloudWatch Logs for log storage and analytics. FireLens works with [Fluent Bit](https://fluentbit.io/) and [Fluentd](https://www.fluentd.org/). We provide an AWS for Fluent Bit image, or you can use your own Fluent Bit or Fluentd image. Creating Amazon ECS task definitions with a FireLens configuration is supported using the AWS SDKs, AWS CLI, and AWS Management Console. For more information about CloudWatch Logs, see [ What is CloudWatch Logs?](https://docs.aws.amazon.com/AmazonCloudWatch/latest/logs/WhatIsCloudWatchLogs.html).

There are key considerations when using FireLens for Amazon ECS. For more information, see [ Considerations](https://docs.aws.amazon.com/AmazonECS/latest/developerguide/using_firelens.html#firelens-considerations).

To find the AWS for Fluent Bit images, see [ Using the AWS for Fluent Bit image](https://docs.aws.amazon.com/AmazonECS/latest/developerguide/firelens-using-fluentbit.html).

To create a task definition that uses a FireLens configuration, see [ Creating a task definition that uses a FireLens configuration](https://docs.aws.amazon.com/AmazonECS/latest/developerguide/firelens-taskdef.html).

**Example**

The following task definition example demonstrates how to specify a log configuration that forwards logs to a CloudWatch Logs log group. For more information, see [What Is Amazon CloudWatch Logs?](https://docs.aws.amazon.com/AmazonCloudWatch/latest/logs/WhatIsCloudWatchLogs.html) in the *Amazon CloudWatch Logs User Guide*.

In the log configuration options, specify the log group name and the Region it exists in. To have Fluent Bit create the log group on your behalf, specify `"auto_create_group":"true"`. You can also specify the task ID as the log stream prefix, which assists in filtering. For more information, see [Fluent Bit Plugin for CloudWatch Logs](https://github.com/aws/amazon-cloudwatch-logs-for-fluent-bit/blob/mainline/README.md).

```
{
	"family": "firelens-example-cloudwatch",
	"taskRoleArn": "arn:aws:iam::123456789012:role/ecs_task_iam_role",
	"containerDefinitions": [
		{
			"essential": true,
			"image": "906394416424.dkr.ecr.us-west-2.amazonaws.com/aws-for-fluent-bit:latest",
			"name": "log_router",
			"firelensConfiguration": {
				"type": "fluentbit"
			},
			"logConfiguration": {
				"logDriver": "awslogs",
				"options": {
					"awslogs-group": "firelens-container",
					"awslogs-region": "us-west-2",
					"awslogs-create-group": "true",
					"awslogs-stream-prefix": "firelens"
				}
			},
			"memoryReservation": 50
		 },
		 {
			 "essential": true,
			 "image": "nginx",
			 "name": "app",
			 "logConfiguration": {
				 "logDriver":"awsfirelens",
				 "options": {
					"Name": "cloudwatch_logs",
					"region": "us-west-2",
					"log_key": "log",
                                 "log_group_name": "/aws/ecs/containerinsights/my-cluster/application",
					"auto_create_group": "true",
					"log_stream_name": "my-task-id"
				}
			},
			"memoryReservation": 100
		}
	]
}
```