Updated on 2023-06-25 GMT+08:00

Creating an Application Component Instance

Function

This API is used to create an application component instance.

URI

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

Table 1 Path parameters

Parameter

Type

Mandatory

Description

project_id

String

Yes

Tenant's project ID.

application_id

String

Yes

Application ID.

component_id

String

Yes

Component ID.

Request

Table 2 Request parameters

Parameter

Type

Mandatory

Description

name

String

Yes

Component instance name.

The value contains 2 to 63 characters consisting of lowercase letters, digits, and hyphens (-). It starts with a lowercase letter and ends with a lowercase letter or digit.

environment_id

String

Yes

Environment ID.

replica

Integer

Yes

Number of instance replicas.

flavor_id

String

Yes

Resource specifications, which can be obtained by using the API in Obtaining All Supported Flavors of Application Resources.

If you need to customize resource specifications, the format is as follows: CUSTOM-xxG:xxC-xxC:xxGi-xxGi. Where:

  • xxG: storage capacity allocated to a component instance. It is a reserved field. You can set it to a fixed number.
  • xxC-xxC: the maximum and minimum number of CPU cores allocated to a component instance.
  • xxGi-xxGi: the maximum and minimum memory allocated to a component instance.

For example, CUSTOM-10G:0.5C-0.25C:1.6Gi-0.8Gi indicates that the maximum number of CPU cores allocated to a component instance is 0.5, the minimum number of CPU cores is 0.25, the maximum memory is 1.6 Gi, and the minimum memory is 0.8 Gi.

artifacts

Map<String, Object>

Yes

Artifact. key indicates the component name. In the Docker container scenario, key indicates the container name. See Table 19.

version

String

Yes

Application component version that meets version semantics. Example: 1.0.0.

configuration

Object

No

Configuration parameters, such as environment variables, deployment configurations, and O&M monitoring. By default, this parameter is left blank. See Table 3.

description

String

No

Description.

The value can contain up to 128 characters.

external_accesses

Array of objects

No

External network access. See Table 20.

refer_resources

Array of objects

Yes

Deployed resources. See Table 21.

Table 3 configuration parameters

Parameter

Type

Mandatory

Description

env

Array of objects

No

Environment variable. See Table 4.

storage

Array of objects

No

Data storage configuration. For details, see Table 5.

strategy

Object

No

Upgrade policy. For details, see Table 6.

lifecycle

Object

No

Lifecycle. For details, see Table 7.

scheduler

Object

No

Scheduling policy. For details, see Table 8.

probes

Object

No

Health check. For details, see Table 9.

Table 4 environment parameters

Parameter

Type

Mandatory

Description

name

String

Yes

Name of the environment variable.

The value contains 1 to 64 characters consisting of letters, digits, underscores (_), hyphens (-), and dots (.), and cannot start with a digit.

value

String

Yes

Environment variable value.

Table 5 storage parameters

Parameter

Type

Mandatory

Description

type

String

Yes

Storage type. Value:

  • HostPath: host path mounting.
  • EmptyDir: temporary directory mounting.
  • ConfigMap: configuration item mounting.
  • Secret: secret volume mounting.
  • PersistentVolumeClaim: cloud storage mounting.

parameters

Object

Yes

Storage parameter. For details, see Table 18.

mounts

Array of objects

Yes

Directory mounted to the container. For details, see Table 17.

Table 6 strategy parameter

Parameter

Type

Mandatory

Description

upgrade

String

No

Upgrade policy. Value: Recreate or RollingUpdate (default). The former indicates in-place upgrade while the latter indicates rolling upgrade.

Table 7 lifecycle parameters

Parameter

Type

Mandatory

Description

entrypoint

Object

No

Startup command. For details, see Table 15.

post-start

Object

No

Post-start processing. For details, see Table 15.

pre-stop

Object

No

Pre-stop processing. For details, see Table 15.

Table 8 scheduler parameters

Parameter

Type

Mandatory

Description

affinity

Object

No

Affinity. For details, see Table 14.

anti-affinity

Object

No

Anti-affinity. For details, see Table 14.

Table 9 probes parameters

Parameter

Type

Mandatory

Description

livenessProbe

Object

No

Component liveness probe. For details, see Table 10.

readinessProbe

Object

No

Component service probe. For details, see Table 10.

Table 10 probes_object parameters

Parameter

Type

Mandatory

Description

type

String

Yes

Value: http, tcp, or command. The check methods are HTTP request check, TCP port check, and command execution check, respectively.

parameters

Object

Yes

Parameters.

delay

Integer

No

Interval between the startup and detection.

timeout

Integer

No

Detection timeout interval.

Table 11 probes_param_http parameters

Parameter

Type

Mandatory

Description

scheme

String

Yes

Value: HTTP or HTTPS.

host

String

No

Pod IP address (default). You can specify an IP address.

port

Integer

Yes

Port.

path

String

Yes

Request path.

Table 12 probes_param_command parameters

Parameter

Type

Mandatory

Description

command

Array of String

Yes

Command list.

Table 13 probes_param_tcp parameters

Parameter

Type

Mandatory

Description

port

Integer

Yes

Port

Table 14 scheduler_affinity parameters

Parameter

Type

Mandatory

Description

az

Array of String

No

AZ list.

node

Array of String

No

Node private IP address list.

application

Array of String

No

Component instance list.

Table 15 lifecycle_entrypoint parameters

Parameter

Type

Mandatory

Description

command

Array of String

Yes

Command that can be executed.

args

Array of String

Yes

Running parameters.

Table 16 lifecycle_process parameters

Parameter

Type

Mandatory

Description

type

String

Yes

Value: command or http. The former indicates command execution and the latter indicates HTTP requests.

parameters

Object

Yes

Post-start or pre-stop processing parameters. See Table 17.

Table 17 lifecycle_process_parameters parameters

Parameter

Type

Mandatory

Description

command

Array of String

Yes

Command parameters, for example, ["sleep", "1"]. This parameter is applicable to the command type.

host

String

No

Pod IP address (default). You can also specify an IP address. This parameter is applicable to the http type.

port

Integer

Yes

Port number. This parameter is applicable to the http type.

path

String

Yes

Request URL. This parameter is applicable to the http type.

Table 18 storage_parameters parameters

Parameter

Type

Mandatory

Description

path

String

No

Host path. This parameter is applicable to the HostPath storage type.

name

String

No

Name of a configuration item or secret. This parameter is applicable to the ConfigMap and Secret storage type.

claimName

String

No

PVC name. This parameter is applicable to the PersistentVolumeClaim storage type.

Table 19 artifact parameters

Parameter

Type

Mandatory

Description

storage

String

Yes

Storage mode. Value: swr or obs.

type

String

Yes

Type. Value: package (VM-based deployment) or image (container-based deployment).

url

String

Yes

Software package or image address. For a component deployed on a VM, this parameter is the software package address. For a component deployed based on a container, this parameter is the image address or component name:v${index}. The latter indicates that the component source code or the image automatically built using the software package will be used.

auth

String

Yes

Authentication mode. Value: iam or none. Default value: iam.

version

String

No

Version number.

properties

Map<String, Object>

No

Property information.

Table 20 external_accesses parameters

Parameter

Type

Mandatory

Description

protocol

String

No

Protocol. Value: http or https.

address

String

No

Access address.

forward_port

Integer

No

Port number.

Table 21 refer_resources parameters

Parameter

Type

Mandatory

Description

id

String

Yes

Resource ID.

Note: If type is set to ecs, the value of this parameter must be Default.

type

String

Yes

Basic resources: cce, and ecs.

Optional resources: dcs, elb, and other services.

refer_alias

String

No

Application alias, which is provided only in DCS scenario. Value: "distributed_session", "distributed_cache", "distributed_session, distributed_cache".

Default value: "distributed_session, distributed_cache".

parameters

Map<String,Object>

No

Reference resource parameter.

NOTICE:
  • When type is set to cce, this parameter is mandatory. You need to specify the namespace of the cluster where the component is to be deployed. Example: {"namespace": "default"}.
  • When type is set to ecs, this parameter is mandatory. You need to specify the hosts where the component is to be deployed. Example: {"hosts":["04d9f887-9860-4029-91d1-7d3102903a69", "04d9f887-9860-4029-91d1-7d3102903a70"]}}.

Response

Table 22 Response parameters

Parameter

Type

Description

job_id

String

Job ID, which is used to query information about the created job.

instance_id

String

Component instance ID.

Example

Example request

{
    "name": "component-instance-name", 
    "environment_id": "6e763000-9128-4a9d-adea-34c42cc5344d", 
    "flavor_id": "MICRO-5G:0.5C:1G", 
    "replica": 1, 
    "artifacts": {
        "container-name": {
            "storage": "swr", 
            "type": "image", 
            "url": "{IP}:20202/xxxxxxxx/junit-platformstest:1.0", 
            "auth": "iam"
        }
    }, 
    "version": 1, 
    "description": "instance desc", 
    "configuration": {
        "env": [
            {
                "name": "log-level", 
                "value": "warn"
            }
        ]
    }, 
    "refer_resources": [
        {
            "id": "b6862a62-d916-11e9-bdf1-0255ac101fd9", 
            "type": "cce", 
            "parameters": {
                "namespace": "default"
            }
        }, 
        {
            "id": "8c0a45cc-626f-4d65-8257-507ee059aa9a", 
            "type": "elb"
        }
    ]
}

Example response

{
    "instance_id": "89f5baf5-efe4-4f12-9c0d-734d2af5a184", 
    "job_id": "JOB66761060-f209-407c-a093-4df6f531b9dc"
}

Status Code

Table 23 Status codes

Status Code

Description

200

OK

400

Bad Request

404

Not Found

500

Internal Server Error

Error Code

Error code must be in the format of SVCSTG.00100.[Error_ID]. Example: SVCSTG.00100400. See Error Codes of Application Management APIs.