Account settings - Amazon ECS

Account settings

You can go into Amazon ECS account settings to opt in or out of specific features. For each AWS Region, you can opt in to, or opt out of, each account setting at the account-level or for a specific user or role.

You might want to opt in or out of specific features if any of the following is relevant to you:

  • A user or role can opt in or opt out specific account settings for their individual account.

  • A user or role can set the default opt-in or opt-out setting for all users on the account.

  • The root user can opt in to, or opt out of, any specific role or user on the account. If the account setting for the root user is changed, it sets the default for all the users and roles that no individual account setting was selected for.


Federated users assume the account setting of the root user and can't have explicit account settings set for them separately.

The following account settings are available. The opt-in and opt-out option must be selected for each account setting separately.

Amazon Resource Names (ARNs) and IDs

Resource names: serviceLongArnFormat, taskLongArnFormat, and containerInstanceLongArnFormat

Amazon ECS is introducing a new format for Amazon Resource Names (ARNs) and resource IDs for Amazon ECS services, tasks, and container instances. The opt-in status for each resource type determines the Amazon Resource Name (ARN) format the resource uses. You must opt in to the new ARN format to use features such as resource tagging for that resource type. For more information, see Amazon Resource Names (ARNs) and IDs.

Only resources launched after opting in receive the new ARN and resource ID format. All existing resources aren't affected. For Amazon ECS services and tasks to transition to the new ARN and resource ID formats, you must recreate the service or task. To transition a container instance to the new ARN and resource ID format, the container instance must be drained and a new container instance that's registered to the cluster.


Tasks launched by an Amazon ECS service can only receive the new ARN and resource ID format if the service was created on or after November 16, 2018, and the user who created the service has opted in to the new format for tasks.

CloudWatch Container Insights

Resource name: containerInsights

CloudWatch Container Insights collects, aggregates, and summarizes metrics and logs from your containerized applications and microservices. The metrics include utilization for resources such as CPU, memory, disk, and network. Container Insights also provides diagnostic information, such as container restart failures, to help you isolate issues and resolve them quickly. You can also set CloudWatch alarms on metrics that Container Insights collects. For more information, see Amazon ECS CloudWatch Container Insights.

When you opt in to the containerInsights account setting, all new clusters have Container Insights enabled by default. You can disable this setting for specific clusters when you create them. You can also change this setting by using the UpdateClusterSettings API.

Dual-stack VPC IPv6

Resource name: dualStackIPv6

Amazon ECS supports providing tasks with an IPv6 address in addition to the primary private IPv4 address.

For tasks to receive an IPv6 address, the task must use the awsvpc network mode, must be launched in a VPC configured for dual-stack mode, and the dualStackIPv6 account setting must be enabled. For more information about other requirements, see Using a VPC in dual-stack mode.


The dualStackIPv6 account setting can only be changed using either the Amazon ECS API or the AWS CLI. For more information, see Modifying account settings.

If you had a running task using the awsvpc network mode in an IPv6 enabled subnet between the dates of October 1, 2020 and November 2, 2020, the default dualStackIPv6 account setting in the Region that the task was running in is disabled. If that condition isn't met, the default dualStackIPv6 setting in the Region is enabled.

Amazon Resource Names (ARNs) and IDs

When Amazon ECS resources are created, each resource is assigned a unique Amazon Resource Name (ARN) and resource identifier (ID). If you use a command line tool or the Amazon ECS API to work with Amazon ECS, resource ARNs or IDs are required for certain commands. For example, if you use the stop-task AWS CLI command to stop a task, you must specify the task ARN or ID in the command.

You can opt in to and opt out of the new Amazon Resource Name (ARN) and resource ID format on a per-Region basis. Currently, any new account created is opted in by default.

You can opt in or opt out of the new Amazon Resource Name (ARN) and resource ID format at any time. After you opted in, any new resources that you create use the new format.


A resource ID doesn't change after it's created. Therefore, opting in or out of the new format doesn't affect your existing resource IDs.

The following sections describe how ARN and resource ID formats are changing. For more information about the transition to the new formats, see Amazon Elastic Container Service FAQ.

Amazon Resource Name (ARN) format

Some resources have a user-friendly name, such as a service named production. In other cases, you must specify a resource using the Amazon Resource Name (ARN) format. The new ARN format for Amazon ECS tasks, services, and container instances includes the cluster name. For information about opting in to the new ARN format, see Modifying account settings.

The following table shows both the current format and the new format for each resource type.

Resource type


Container instance

Current: arn:aws:ecs:region:aws_account_id:container-instance/container-instance-id

New: arn:aws:ecs:region:aws_account_id:container-instance/cluster-name/container-instance-id

Amazon ECS service

Current: arn:aws:ecs:region:aws_account_id:service/service-name

New: arn:aws:ecs:region:aws_account_id:service/cluster-name/service-name

Amazon ECS task

Current: arn:aws:ecs:region:aws_account_id:task/task-id

New: arn:aws:ecs:region:aws_account_id:task/cluster-name/task-id

Resource ID length

A resource ID takes the form of a unique combination of letters and numbers. New resource ID formats include shorter IDs for Amazon ECS tasks and container instances. The current resource ID format is 36 characters long. The new IDs are in a 32-character format that doesn't include any hyphens. For information about opting in to the new resource ID format, see Modifying account settings.

ARN and resource ID format timeline

The timeline for the opt-in and opt-out periods for the new Amazon Resource Name (ARN) and resource ID format for Amazon ECS resources ended on April 1, 2021. By default, all accounts are opted in to the new format. All new resources created receive the new format, and you can no longer opt out.