Querying the Operations Performed on a Component Instance

This API is used to query the operations performed on a component instance.

POST /v2/{project_id}/cas/applications/{application_id}/components/{component_id}/instances/{instance_id}/action

**Table 1** Path parameters
Parameter	Mandatory	Type	Description
project_id	Yes	String	Tenant's project ID. See Obtaining a Project ID.
application_id	Yes	String	Application ID. See Obtaining All Applications.
component_id	Yes	String	Component ID. See Obtaining All Components of an Application.
instance_id	Yes	String	Component instance ID. See Obtaining All Component Instances.

**Table 2** Request header parameters
Parameter	Mandatory	Type	Description
Content-Type	Yes	String	Message body type (format). Default value: application/json;charset=utf8.
X-Auth-Token	Yes	String	API calling can be authenticated using a token or AK/SK. If you use a token, this parameter is mandatory and must be set to the token. For details about how to obtain a token, see Obtaining a User Token.

**Table 3** Request body parameters
Parameter	Mandatory	Type	Description
action	Yes	String	Operation. Value: start, stop, restart, scale, or rollback. start stop restart scale rollback
parameters	No	Object	Operation parameter, which is mandatory when action is set to scale or rollback. See Table 4.

**Table 4** parameters
Parameter	Mandatory	Type	Description
replica	No	Integer	Number of instances, which is mandatory when action is set to scale.
hosts	No	Array	ECS ID list. This parameter specifies the ECS deployed during VM scaling, and is mandatory for scaling.
version	No	String	Version number, which is mandatory when action is set to rollback. You can obtain the version number by using the API in Obtaining Component Instance Snapshots.

**Table 5** Response parameters
Parameter	Type	Description
job_id	String	Job ID.

Scale component instances and change the number of component instances to 4.

{
  "action": "scale",
  "parameters": {
    "replica": 4
  }
}

{
    "job_id": "JOB66761060-f209-407c-a093-4df6f531b9dc"
}

The error code format is SVCSTG.00100.[Error_ID], for example, SVCSTG.00100400. For details, see ServiceStage Error Codes.

Parent topic: Instance

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