Configuring a Health Check

Function

This API is used to configure a health check.

Constraints

The security groups must have rules that allow access from 100.125.0.0/16. If you want to use UDP for health checks, ensure that the protocol of the backend server group is UDP.

URI

POST /v3/{project_id}/elb/healthmonitors

**Table 1** Path parameters
Parameter	Mandatory	Type	Description
project_id	Yes	String	Specifies the project ID.

Request Parameters

**Table 2** Request header parameters
Parameter	Mandatory	Type	Description
X-Auth-Token	Yes	String	Specifies the token used for IAM authentication.

**Table 3** Request body parameters
Parameter	Mandatory	Type	Description
healthmonitor	Yes	Crea teHealthMonitorOption <#CreateHealthMonit or__request_CreateHealthMonitorOption>__ object	Specifies the health check.

**Table 4** CreateHealthMonitorOption
Parameter	Mandatory	Type	Description
admin_state_up	No	Boolean	Specifies the administrative status of the health check. Two value options are available. true indicates that the health check is enabled, and false indicates that the health check is disabled. Default: true
delay	Yes	Integer	Specifies the interval between health checks, in seconds. Minimum: 1 Maximum: 50
domain_name	No	String	Specifies the domain name that HTTP requests are sent to during the health check. This parameter is available only when type is set to HTTP. The value is left blank by default, indicating that the virtual IP address of the load balancer is used as the destination address of HTTP requests. The value can contain only digits, letters, hyphens (-), and periods (.) and must start with a digit or letter. Minimum: 1 Maximum: 100
expected_codes	No	String	Specifies the expected HTTP status code. This parameter will take effect only when type is set to HTTP. The value options are as follows: A specific value, for example, 200 A list of values that are separated with commas (,), for example, 200, 202 A value range, for example, 200-204 This parameter is unsupported. Please do not use it. Default: 200 Minimum: 1 Maximum: 64
http_method	No	String	Specifies the HTTP method. The value can be GET, HEAD, POST, PUT, DELETE, TRACE, OPTIONS, CONNECT, or PATCH. This parameter will take effect only when type is set to HTTP. This parameter is unsupported. Please do not use it. Default: GET Minimum: 1 Maximum: 16
max_retries	Yes	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. Minimum: 1 Maximum: 10
max_retries_down	No	Integer	Specifies the number of consecutive health checks when the health check result of a backend server changes from ONLINE to OFFLINE. Minimum: 1 Maximum: 10 Default: 3
monitor_port	No	Integer	Specifies the port used for the health check. If this parameter is left blank, the port of the backend server group will be used by default. Minimum: 1 Maximum: 65535
name	No	String	Specifies the health check name. Minimum: 0 Maximum: 255
pool_id	Yes	String	Specifies the ID of the backend server group for which the health check is configured.
project_id	No	String	Specifies the project ID. Minimum: 1 Maximum: 32
timeout	Yes	Integer	Specifies the maximum time required for waiting for a response from the health check, in seconds. It is recommended that you set the value less than that of parameter delay. Minimum: 1 Maximum: 50
type	Yes	String	Specifies the health check protocol. The value can be TCP, UDP_CONNECT, HTTP, HTTPS, or PING.
url_path	No	String	Specifies the HTTP request path for the health check. The value must start with a slash (/), and the default value is /. This parameter is available only when type is set to HTTP. Default: / Minimum: 1 Maximum: 255

Response Parameters

Status code: 201

**Table 5** Response body parameters
Parameter	Type	Description
request_id	String	Specifies the request ID. The value is automatically generated.
healthmonitor	HealthMonitor <# CreateHealthMonitor__response_HealthMonitor>__ object	Specifies the health check.

**Table 6** HealthMonitor
Parameter	Type	Description
admin_state_up	Boolean	Specifies the administrative status of the health check. Two value options are available. true indicates that the health check is enabled, and false indicates that the health check is disabled. Default: true
delay	Integer	Specifies the interval between health checks, in seconds. Minimum: 1 Maximum: 50
domain_name	String	Specifies the domain name that HTTP requests are sent to during the health check. This parameter is available only when type is set to HTTP. The value is left blank by default, indicating that the virtual IP address of the load balancer is used as the destination address of HTTP requests. The value can contain only digits, letters, hyphens (-), and periods (.) and must start with a digit or letter.
expected_codes	String	Specifies the expected HTTP status code. This parameter will take effect only when type is set to HTTP. The value options are as follows: A specific value, for example, 200 A list of values that are separated with commas (,), for example, 200, 202 A value range, for example, 200-204 This parameter is unsupported. Please do not use it. Default: 200
http_method	String	Specifies the HTTP method. This parameter will take effect only when type is set to HTTP. The value can be GET, HEAD, POST, PUT, DELETE, TRACE, OPTIONS, CONNECT, or PATCH. This parameter is unsupported. Please do not use it. Default: GET
id	String	Specifies the health check ID.
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. Minimum: 1 Maximum: 10
max_retries_down	Integer	Specifies the number of consecutive health checks when the health check result of a backend server changes from ONLINE to OFFLINE. Minimum: 1 Maximum: 10 Default: 3
monitor_port	Integer	Specifies the port used for the health check. If this parameter is left blank, the port of the backend server group will be used by default. Minimum: 1 Maximum: 65535
name	String	Specifies the health check name.
pools	Array of PoolRef <#Crea teHealthMonitor__response_PoolRef>__ objects	Lists the IDs of backend server groups for which the health check is configured.
project_id	String	Specifies the project ID.
timeout	Integer	Specifies the maximum time required for waiting for a response from the health check, in seconds. It is recommended that you set the value less than that of parameter delay. Minimum: 1 Maximum: 50
type	String	Specifies the health check protocol.
url_path	String	Specifies the HTTP request path for the health check. The value must start with a slash (/), and the default value is /. This parameter is available only when type is set to HTTP. Default: /

**Table 7** PoolRef
Parameter	Type	Description
id	String	Specifies the ID of the backend server group.

Example Requests

POST

https://{elb_endpoint}/v3/99a3fff0d03c428eac3678da6a7d0f24/elb/healthmonitors

{
  "healthmonitor" : {
    "name" : "My Healthmonitor",
    "max_retries" : 3,
    "pool_id" : "488acc50-6bcf-423d-8f0a-0f4184f5b8a0",
    "type" : "HTTP",
    "timeout" : 30,
    "delay" : 1
  }
}

Example Responses

Status code: 201

Successful request.

{
  "request_id" : "0e837340-f1bd-4037-8f61-9923d0f0b19e",
  "healthmonitor" : {
    "id" : "c2b210b2-60c4-449d-91e2-9e9ea1dd7441",
    "project_id" : "99a3fff0d03c428eac3678da6a7d0f24",
    "name" : "My Healthmonitor",
    "delay" : 1,
    "max_retries" : 3,
    "pools" : [ {
      "id" : "488acc50-6bcf-423d-8f0a-0f4184f5b8a0"
    } ],
    "admin_state_up" : true,
    "timeout" : 30,
    "type" : "HTTP",
    "expected_codes" : "200",
    "url_path" : "/",
    "http_method" : "GET"
  }
}

Status Codes

Status Code	Description
201	Successful request.

Error Codes

See Error Codes.

Parent topic: Health Check

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