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 |