CreateCluster - Amazon Elastic Container Service


Creates a new Amazon ECS cluster. By default, your account receives a default cluster when you launch your first container instance. However, you can create your own cluster with a unique name with the CreateCluster action.


When you call the CreateCluster API operation, Amazon ECS attempts to create the Amazon ECS service-linked role for your account. This is so that it can manage required resources in other AWS services on your behalf. However, if the user that makes the call doesn't have permissions to create the service-linked role, it isn't created. For more information, see Using service-linked roles for Amazon ECS in the Amazon Elastic Container Service Developer Guide.

Request Syntax

{ "capacityProviders": [ "string" ], "clusterName": "string", "configuration": { "executeCommandConfiguration": { "kmsKeyId": "string", "logConfiguration": { "cloudWatchEncryptionEnabled": boolean, "cloudWatchLogGroupName": "string", "s3BucketName": "string", "s3EncryptionEnabled": boolean, "s3KeyPrefix": "string" }, "logging": "string" }, "managedStorageConfiguration": { "fargateEphemeralStorageKmsKeyId": "string", "kmsKeyId": "string" } }, "defaultCapacityProviderStrategy": [ { "base": number, "capacityProvider": "string", "weight": number } ], "serviceConnectDefaults": { "namespace": "string" }, "settings": [ { "name": "string", "value": "string" } ], "tags": [ { "key": "string", "value": "string" } ] }

Request Parameters

For information about the parameters that are common to all actions, see Common Parameters.

The request accepts the following data in JSON format.


The short name of one or more capacity providers to associate with the cluster. A capacity provider must be associated with a cluster before it can be included as part of the default capacity provider strategy of the cluster or used in a capacity provider strategy when calling the CreateService or RunTask actions.

If specifying a capacity provider that uses an Auto Scaling group, the capacity provider must be created but not associated with another cluster. New Auto Scaling group capacity providers can be created with the CreateCapacityProvider API operation.

To use a AWS Fargate capacity provider, specify either the FARGATE or FARGATE_SPOT capacity providers. The AWS Fargate capacity providers are available to all accounts and only need to be associated with a cluster to be used.

The PutCapacityProvider API operation is used to update the list of available capacity providers for a cluster after the cluster is created.

Type: Array of strings

Required: No


The name of your cluster. If you don't specify a name for your cluster, you create a cluster that's named default. Up to 255 letters (uppercase and lowercase), numbers, underscores, and hyphens are allowed.

Type: String

Required: No


The execute command configuration for the cluster.

Type: ClusterConfiguration object

Required: No


The capacity provider strategy to set as the default for the cluster. After a default capacity provider strategy is set for a cluster, when you call the CreateService or RunTask APIs with no capacity provider strategy or launch type specified, the default capacity provider strategy for the cluster is used.

If a default capacity provider strategy isn't defined for a cluster when it was created, it can be defined later with the PutClusterCapacityProviders API operation.

Type: Array of CapacityProviderStrategyItem objects

Required: No


Use this parameter to set a default Service Connect namespace. After you set a default Service Connect namespace, any new services with Service Connect turned on that are created in the cluster are added as client services in the namespace. This setting only applies to new services that set the enabled parameter to true in the ServiceConnectConfiguration. You can set the namespace of each service individually in the ServiceConnectConfiguration to override this default parameter.

Tasks that run in a namespace can use short names to connect to services in the namespace. Tasks can connect to services across all of the clusters in the namespace. Tasks connect through a managed proxy container that collects logs and metrics for increased visibility. Only the tasks that Amazon ECS services create are supported with Service Connect. For more information, see Service Connect in the Amazon Elastic Container Service Developer Guide.

Type: ClusterServiceConnectDefaultsRequest object

Required: No


The setting to use when creating a cluster. This parameter is used to turn on CloudWatch Container Insights for a cluster. If this value is specified, it overrides the containerInsights value set with PutAccountSetting or PutAccountSettingDefault.

Type: Array of ClusterSetting objects

Required: No


The metadata that you apply to the cluster to help you categorize and organize them. Each tag consists of a key and an optional value. You define both.

The following basic restrictions apply to tags:

  • Maximum number of tags per resource - 50

  • For each resource, each tag key must be unique, and each tag key can have only one value.

  • Maximum key length - 128 Unicode characters in UTF-8

  • Maximum value length - 256 Unicode characters in UTF-8

  • If your tagging schema is used across multiple services and resources, remember that other services may have restrictions on allowed characters. Generally allowed characters are: letters, numbers, and spaces representable in UTF-8, and the following characters: + - = . _ : / @.

  • Tag keys and values are case-sensitive.

  • Do not use aws:, AWS:, or any upper or lowercase combination of such as a prefix for either keys or values as it is reserved for AWS use. You cannot edit or delete tag keys or values with this prefix. Tags with this prefix do not count against your tags per resource limit.

Type: Array of Tag objects

Array Members: Minimum number of 0 items. Maximum number of 50 items.

Required: No

Response Syntax

{ "cluster": { "activeServicesCount": number, "attachments": [ { "details": [ { "name": "string", "value": "string" } ], "id": "string", "status": "string", "type": "string" } ], "attachmentsStatus": "string", "capacityProviders": [ "string" ], "clusterArn": "string", "clusterName": "string", "configuration": { "executeCommandConfiguration": { "kmsKeyId": "string", "logConfiguration": { "cloudWatchEncryptionEnabled": boolean, "cloudWatchLogGroupName": "string", "s3BucketName": "string", "s3EncryptionEnabled": boolean, "s3KeyPrefix": "string" }, "logging": "string" }, "managedStorageConfiguration": { "fargateEphemeralStorageKmsKeyId": "string", "kmsKeyId": "string" } }, "defaultCapacityProviderStrategy": [ { "base": number, "capacityProvider": "string", "weight": number } ], "pendingTasksCount": number, "registeredContainerInstancesCount": number, "runningTasksCount": number, "serviceConnectDefaults": { "namespace": "string" }, "settings": [ { "name": "string", "value": "string" } ], "statistics": [ { "name": "string", "value": "string" } ], "status": "string", "tags": [ { "key": "string", "value": "string" } ] } }

Response Elements

If the action is successful, the service sends back an HTTP 200 response.

The following data is returned in JSON format by the service.


The full description of your new cluster.

Type: Cluster object


For information about the errors that are common to all actions, see Common Errors.


These errors are usually caused by a client action. This client action might be using an action or resource on behalf of a user that doesn't have permissions to use the action or resource. Or, it might be specifying an identifier that isn't valid.

The following list includes additional causes for the error:

  • The RunTask could not be processed because you use managed scaling and there is a capacity error because the quota of tasks in the PROVISIONING per cluster has been reached. For information about the service quotas, see Amazon ECS service quotas.

HTTP Status Code: 400


The specified parameter isn't valid. Review the available parameters for the API request.

HTTP Status Code: 400


The specified namespace wasn't found.

HTTP Status Code: 400


These errors are usually caused by a server issue.

HTTP Status Code: 500


In the following example or examples, the Authorization header contents (AUTHPARAMS) must be replaced with an AWS Signature Version 4 signature. For more information, see Signature Version 4 Signing Process in the AWS General Reference.

You only need to learn how to sign HTTP requests if you intend to create them manually. When you use the AWS Command Line Interface or one of the AWS SDKs to make requests to AWS, these tools automatically sign the requests for you, with the access key that you specify when you configure the tools. When you use these tools, you don't have to sign requests yourself.


This example request creates a cluster called My-cluster.

Sample Request

POST / HTTP/1.1 Host: Accept-Encoding: identity Content-Length: 29 X-Amz-Target: AmazonEC2ContainerServiceV20141113.CreateCluster X-Amz-Date: 20150429T163840Z Content-Type: application/x-amz-json-1.1 Authorization: AUTHPARAMS { "clusterName": "My-cluster" }

Sample Response

HTTP/1.1 200 OK Server: Server Date: Wed, 29 Apr 2015 16:38:41 GMT Content-Type: application/x-amz-json-1.1 Content-Length: 209 Connection: keep-alive x-amzn-RequestId: 123a4b56-7c89-01d2-3ef4-example5678f { "cluster": { "activeServicesCount": 0, "clusterArn": "arn:aws:ecs:us-east-1:012345678910:cluster/My-cluster", "clusterName": "My-cluster", "pendingTasksCount": 0, "registeredContainerInstancesCount": 0, "runningTasksCount": 0, "status": "ACTIVE" } }

See Also

For more information about using this API in one of the language-specific AWS SDKs, see the following: