Updated on 2022-01-25 GMT+08:00

Querying Health Checks

Function

This API is used to query all the health checks. Filter query and pagination query are supported. Unless otherwise specified, exact match is applied.

URI

GET /v2/{project_id}/elb/healthmonitors

Table 1 Parameter description

Parameter

Mandatory

Type

Description

project_id

Yes

String

Specifies the project ID.

Request

Table 2 Parameter description

Parameter

Mandatory

Type

Description

marker

No

String

Specifies the ID of the health check from which pagination query starts, that is, the ID of the last health check on the previous page.

This parameter must be used with limit.

limit

No

Integer

Specifies the number of health checks on each page. If this parameter is not set, all health checks are queried by default.

page_reverse

No

Boolean

Specifies the page direction. The value can be true or false, and the default value is false. The last page in the list requested with page_reverse set to false will not contain the "next" link, and the last page in the list requested with page_reverse set to true will not contain the "previous" link.

This parameter must be used with limit.

id

No

String

Specifies the health check ID.

tenant_id

No

String

Specifies the ID of the project where the health check is performed.

The value contains a maximum of 255 characters.

name

No

String

Specifies the health check name.

The value contains a maximum of 255 characters.

delay

No

Integer

Specifies the maximum time between health checks in the unit of second. The value ranges from 1 to 50.

max_retries

No

Integer

Specifies the number of consecutive health checks when the health check result of a backend server changes from OFFLINE to ONLINE. The value ranges from 1 to 10.

admin_state_up

No

Boolean

Specifies the administrative status of the health check.

The value can be true or false. The default value is true.

  • true: indicates that the health check function is enabled.
  • false: indicates that the health check function is disabled.

timeout

No

Integer

Specifies the health check timeout duration in the unit of second. The value ranges from 1 to 50.

NOTE:

You are advised to set the value less than that of parameter delay.

type

No

String

Specifies the health check protocol.

The value can be TCP, UDP_CONNECT, or HTTP.

monitor_port

No

Integer

Specifies the port used for the health check.

The value is left blank by default, indicating that the port of the backend server is used as the health check port.

expected_codes

No

String

Specifies the expected HTTP status code. The following options are available:

A single value, such as 200

A list of values, such as 200,202

A value range, such as 200-204

This parameter is valid only when the value of type is set to HTTP.

The value contains a maximum of 64 characters.

NOTE:

This parameter is reserved.

domain_name

No

String

Specifies the domain name of HTTP requests during the health check.

This parameter is valid only when the value of type is set to HTTP.

The parameter value is left blank by default, indicating that the private IP address of the load balancer is used as the destination address of HTTP requests.

The parameter value can contain only digits, letters, hyphens (-), and periods (.) and must start with a digit or letter,

for example: www.test.com.

The value contains a maximum of 100 characters.

url_path

No

String

Specifies the HTTP request path for the health check. The default value is /.

The value starts with a slash (/).

This parameter is valid only when the value of type is set to HTTP.

An example value is /test.

The value contains a maximum of 255 characters.

http_method

No

String

Specifies the HTTP request method. The default value is GET.

The value can be GET, HEAD, POST, PUT, DELETE, TRACE, OPTIONS, CONNECT, and PATCH.

This parameter is valid only when the value of type is set to HTTP.

The value contains a maximum of 16 characters.

NOTE:

This parameter is reserved.

Response

Table 3 Parameter description

Parameter

Type

Description

healthmonitors

Array

Lists the health checks. For details, see Table 4.

Table 4 healthmonitor parameter description

Parameter

Type

Description

id

String

Specifies the health check ID.

tenant_id

String

Specifies the ID of the project where the health check is performed.

name

String

Specifies the health check name.

delay

Integer

Specifies the maximum time between health checks in the unit of second. The value ranges from 1 to 50.

max_retries

Integer

Specifies the number of consecutive health checks when the health check result of a backend server changes from OFFLINE to ONLINE. The value ranges from 1 to 10.

pools

Array

Lists the IDs of backend server groups associated with the health check. For details, see Table 6.

admin_state_up

Boolean

Specifies the administrative status of the health check.

The value can be true or false. The default value is true.

  • true: indicates that the health check function is enabled.
  • false: indicates that the health check function is disabled.

timeout

Integer

Specifies the health check timeout duration in the unit of second. The value ranges from 1 to 50.

NOTE:

You are advised to set the value less than that of parameter delay.

type

String

Specifies the health check protocol.

The value can be TCP, UDP_CONNECT, or HTTP.

monitor_port

Integer

Specifies the health check port. The port number ranges from 1 to 65535.

The value is left blank by default, indicating that the port of the backend server is used as the health check port.

expected_codes

String

Specifies the expected HTTP status code. The following options are available:

A single value, such as 200

A list of values, such as 200,202

A value range, such as 200-204

This parameter is valid only when the value of type is set to HTTP.

Currently, this parameter is not supported and is fixed at 200.

domain_name

String

Specifies the domain name of HTTP requests during the health check.

This parameter is valid only when the value of type is set to HTTP.

The parameter value is left blank by default, indicating that the private IP address of the load balancer is used as the destination address of HTTP requests.

The parameter value can contain only digits, letters, hyphens (-), and periods (.) and must start with a digit or letter,

for example: www.test.com.

url_path

String

Specifies the HTTP request path for the health check. The default value is /.

The value starts with a slash (/).

This parameter is valid only when the value of type is set to HTTP.

An example value is /test.

http_method

String

Specifies the HTTP request method. The default value is GET.

The value can be GET, HEAD, POST, PUT, DELETE, TRACE, OPTIONS, CONNECT, and PATCH.

This parameter is valid only when the value of type is set to HTTP.

NOTE:

This parameter is reserved.

Table 5 pools parameter description

Parameter

Mandatory

Type

Description

id

Yes

String

Specifies the ID of the backend server group.

Example Request

  • Example request 1: Querying all health checks
    GET https://{Endpoint}/v2/601240b9c5c94059b63d484c92cfe308/elb/healthmonitors
  • Example request 2: Querying HTTP health checks
    GET https://{Endpoint}/v2/601240b9c5c94059b63d484c92cfe308/elb/healthmonitors?type=HTTP

Example Response

  • Example response 1
    {
        "healthmonitors": [
            {
                "monitor_port": null,
                "name": "",
                "admin_state_up": true,
                "tenant_id": "601240b9c5c94059b63d484c92cfe308",
     
                "domain_name": null,
                "delay": 5,
                "expected_codes": "200",
                "max_retries": 3,
                "http_method": "GET",
                "timeout": 10,
                "pools": [
                    {
                        "id": "caef8316-6b65-4676-8293-cf41fb63cc2a"
                    }
                ],
                "url_path": "/",
                "type": "HTTP",
                "id": "1b587819-d619-49c1-9101-fe72d8b361ef"
            }
        ]
    }
  • Example response 2
    {
        "healthmonitors": [
            {
                "monitor_port": null,
                "name": "",
                "admin_state_up": true,
                "tenant_id": "601240b9c5c94059b63d484c92cfe308",
     
                "domain_name": null,
                "delay": 5,
                "expected_codes": "200",
                "max_retries": 3,
                "http_method": "GET",
                "timeout": 10,
                "pools": [
                    {
                        "id": "caef8316-6b65-4676-8293-cf41fb63cc2a"
                    }
                ],
                "url_path": "/",
                "type": "HTTP",
                "id": "1b587819-d619-49c1-9101-fe72d8b361ef"
            }
        ]
    }

Status Code

For details, see HTTP Status Codes of Load Balancers.