This topic describes basic concepts of Operation Orchestration Service (OOS). These concepts can help you to understand OOS.
| Concept | Description |
|---|---|
| Template | A YAML or JSON file that includes one or more tasks. |
| Task | The main component of a template. A task describes the details of a specific O&M action. An action is specified by a task in the template. |
| Action | A specific operation. An action is the minimum O&M unit. Actions are divided into the following types: API actions, product actions, trigger actions, control actions, and embedding actions. The format of an action name is ACS::<Name>. |
| API action | The action in which an API operation is called. It currently supports ACS::ExecuteAPI, ACS::WaitFor, and ACS::CheckFor |
| Cloud product action (or product action) | The action used to perform a common O&M operation on other Alibaba Cloud services. API operations for the services are encapsulated in product actions. When you create a template, you can simplify the writing of code by using encapsulated product actions. For example, ACS::ECS::RunInstances is a product action. After the action is successfully executed, one or more target instances that have been created switch to the running status and are ready for use. The format of a product action name is ACS::<ProductCode>::<Name> |
| Trigger action (or trigger) | The action that defines a condition used to trigger the execution of a template. It currently supports ACS::TimerTrigger. |
| Control action | The action used to specify the order and method of executing tasks. For example, you can use ACS::Approve to manage approval requests. |
| Embedding action | The action used to reference another template (child template) as a task. It currently only supports ACS::Template. You can create a template and use it in another template. Templates that reference other templates are parent templates. |
| Execution | The process of running a template. |
| Task execution | The process of running a task. |
| Loop task | The task that is iteratively executed by using input values from a list. |