Amazon ECS
User Guide for AWS Fargate (API Version 2014-11-13)

Amazon ECS Service Limits

The following table provides the default limits for Amazon ECS for an AWS account which can be changed. For more information on the service limits for other AWS services that you can use with Amazon ECS, such as Elastic Load Balancing and Auto Scaling, see AWS Service Limits in the Amazon Web Services General Reference.

Resource Default Limit
Number of clusters per Region, per account 2000
Number of container instances per cluster 2000
Number of services per cluster 1000
Number of tasks per service (the desired count) 1000
Number of tasks using the Fargate launch type, per Region, per account 50
Number of public IP addresses for tasks using the Fargate launch type 50

The following table provides other limitations for Amazon ECS that cannot be changed.

Resource Limit
Number of load balancers per service 1
Number of tasks launched (count) per run-task 10
Number of container instances per start-task 10
Number of revisions per task definition family


Deregistering a task definition revision does not exclude it from being included in this limit.

Task definition size limit 32 KiB
Task definition max containers 10
Number of subnets specified in awsvpcConfiguration 16
Number of security groups specified in awsvpcConfiguration 5
Maximum size of a shared volume used by multiple containers within a task using the Fargate launch type 4 GB
Maximum container storage for tasks using the Fargate launch type 10 GB
Maximum number of tags per resource (tasks, services, task definitions, clusters, and container instances) 50