Set up Firelens to send logs to CloudWatch Logs - Amazon CloudWatch

Set up Firelens to send logs to CloudWatch Logs

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 and Fluentd. 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?.

There are key considerations when using FireLens for Amazon ECS. For more information, see Considerations.

To find the AWS for Fluent Bit images, see Using the AWS for Fluent Bit image.

To create a task definition that uses a FireLens configuration, see Creating a task definition that uses a FireLens configuration.


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? 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.

{ "family": "firelens-example-cloudwatch", "taskRoleArn": "arn:aws:iam::123456789012:role/ecs_task_iam_role", "containerDefinitions": [ { "essential": true, "image": "", "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", "region": "us-west-2", "log_key": "log", "log_group_name": "/aws/ecs/containerinsights/$(ecs_cluster)/application", "auto_create_group": "true", "log_stream_name": "$(ecs_task_id)" } }, "memoryReservation": 100 } ] }