Amazon ECS service quotas

The following tables provide the default service quotas, also referred to as limits, for Amazon ECS for an AWS account. For more information on the service quotas for other AWS services that you can use with Amazon ECS, such as Elastic Load Balancing and Auto Scaling, see AWS service quotas in the Amazon Web Services General Reference.

Amazon ECS service quotas

The following are Amazon ECS service quotas.

Most of these service quotas, but not all, are listed under the Amazon Elastic Container Service (Amazon ECS) namespace in the Service Quotas console. To request a quota increase, see Requesting a quota increase in the Service Quotas User Guide.

Service quota	Description	Default quota value	Adjustable
Clusters	The maximum number of clusters in this account in the current Region.	10,000	Yes
Container instances per cluster	The maximum number of container instances per cluster.	2,000	Yes
Services per cluster	The maximum number of services per cluster.	5,000	Yes
Tasks per service	The maximum number of tasks per service (the desired count). Note Services configured to use service discovery have a limit of 1,000 tasks per service. This is due to a Route 53 service quota.	5,000	Yes
ECS Exec sessions	The maximum number of ECS Exec sessions per container.	2	Yes
Tasks launched (count) per run-task	The maximum number of tasks that can be launched per RunTask API action.	10	No
Container instances per start-task	The maximum number of container instances specified in a StartTask API action.	10	No
Revisions per task definition family	The maximum number of revisions per task definition family. Deregistering a task definition revision does not exclude it from being included in this limit.	1,000,000	No
Task definition size limit	The maximum size, in KiB, of a task definition.	64	No
Task definition max containers	The maximum number of containers definitions within a task definition.	10	No
Subnets specified in an awsvpcConfiguration	The maximum number of subnets specified within an awsvpcConfiguration.	16	No
Security groups specified in an awsvpcConfiguration	The maximum number of security groups specified within an awsvpcConfiguration.	5	No
Target groups per service	The maximum number of target groups per service, if using an Application Load Balancer or a Network Load Balancer.	5	No
Classic Load Balancers per service	The maximum number of Classic Load Balancers per service.	1	No
Tags per resource	The maximum number of tags per resource. This applies to task definitions, clusters, tasks, and services.	50	No

AWS Fargate service quotas

The following are Amazon ECS on AWS Fargate service quotas.

These service quotas are listed under the AWS Fargate namespace in the Service Quotas console. To request a quota increase, see Requesting a quota increase in the Service Quotas User Guide.

Service quota	Description	Default quota value	Adjustable
Fargate On-Demand resource count	The maximum number of Amazon ECS tasks and Amazon EKS pods running concurrently on Fargate in this account in the current Region.	1,000	Yes
Fargate Spot resource count	The maximum number of Amazon ECS tasks running concurrently on Fargate Spot in this account in the current Region.	1,000	Yes

Managing your Amazon ECS and AWS Fargate service quotas in the AWS Management Console

Amazon ECS has integrated with Service Quotas, an AWS service that enables you to view and manage your quotas from a central location. For more information, see What Is Service Quotas? in the Service Quotas User Guide.

Service Quotas makes it easy to look up the value of your Amazon ECS service quotas.

AWS Management Console

To view Amazon ECS and Fargate service quotas using the AWS Management Console

1. Open the Service Quotas console at https://console.aws.amazon.com/servicequotas/.

2. In the navigation pane, choose AWS services.

3. From the AWS services list, search for and select Amazon Elastic Container Service (Amazon ECS) or AWS Fargate.

   In the Service quotas list, you can see the service quota name, applied value (if it is available), AWS default quota, and whether the quota value is adjustable.

4. To view additional information about a service quota, such as the description, choose the quota name.

5. (Optional) To request a quota increase, select the quota that you want to increase, select Request quota increase, enter or select the required information, and select Request.

To work more with service quotas using the AWS Management Console see the Service Quotas User Guide. To request a quota increase, see Requesting a quota increase in the Service Quotas User Guide.

AWS CLI

To view Amazon ECS and Fargate service quotas using the AWS CLI

Run the following command to view the default Amazon ECS quotas.

aws service-quotas list-aws-default-service-quotas \
    --query 'Quotas[*].{Adjustable:Adjustable,Name:QuotaName,Value:Value,Code:QuotaCode}' \
    --service-code ecs \
    --output table

Run the following command to view the default Fargate quotas.

aws service-quotas list-aws-default-service-quotas \
    --query 'Quotas[*].{Adjustable:Adjustable,Name:QuotaName,Value:Value,Code:QuotaCode}' \
    --service-code fargate \
    --output table

Run the following command to view your applied Fargate quotas.

aws service-quotas list-service-quotas \
    --service-code fargate

Note

Amazon ECS does not support applied quotas.

To work more with service quotas using the AWS CLI, see the Service Quotas AWS CLI Command Reference. To request a quota increase, see the request-service-quota-increase command in the AWS CLI Command Reference.