This topic lists the limits of Resource Orchestration Service (ROS).

Templates

Item Limit
Maximum number of templates that can be created within an Alibaba Cloud account 100
Maximum size of a template file 512 KB

Stacks

Item Limit
Maximum number of stacks that can be created within an Alibaba Cloud account 200
Maximum number of resources that can be created in a stack 300
Maximum number of concurrent operations that can be performed on stacks within an Alibaba Cloud account 50
Maximum number of levels that a nested stack can contain 5
Maximum timeout period of a stack 1,440 minutes (24 hours)
Minimum timeout period of a stack 10 minutes
Maximum size of a stack policy file 16 KB
Maximum size of a custom resource response 4096 KB
Maximum number of change sets that can be created in a stack within an Alibaba Cloud account 20
Maximum size of a change set file 2048 KB

Stack groups

Item Limit
Maximum number of stack groups that can be created within an Alibaba Cloud account 100
Maximum number of instances that you can create in a stack group within an Alibaba Cloud account 2000
Maximum number of concurrent operations that can be performed in stack groups in a region within an Alibaba Cloud account 3500
Maximum number of accounts within which a stack group operation can be performed 30
Maximum number of folders of resource directories in which a stack group operation can be performed 20
Maximum number of regions in which a stack group operation can be performed 20

Scenarios

Item Limit
Maximum number of scenarios that can be created in a region within an Alibaba Cloud account 200
Maximum number of resources that are supported in a scenario 300