Configuring a Health Check

Function

This API is used to configure a health check.

Constraints

The security groups must have rules that allow traffic to 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.

Calling Method

For details, see Calling APIs.

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	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. true (default): Health check is enabled. false: Health check is disabled.
delay	Yes	Integer	Specifies the interval between health checks, in seconds. The value ranges from 1 to 50.
domain_name	No	String	Specifies the domain name that HTTP requests are sent to during the health check. The value can contain only digits, letters, hyphens (-), and periods (.) and must start with a digit or letter. 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. This parameter is available only when type is set to HTTP. 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 or HTTPS. 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 The default value is 200. Multiple status codes can be queried in the format of expected_codes=xxx&expected_codes=xxx. 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. The default value is GET. This parameter is available when type is set to HTTP or HTTPS. This parameter is unsupported. Please do not use it. 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. The value ranges from 1 to 10, and the default value is 3. Minimum: 1 Maximum: 10
monitor_port	No	Integer	Specifies the port used for the health check. If this parameter is left blank, a port of the backend server will be used by default. The port number ranges from 1 to 65535. NOTE: This parameter is mandatory when Forward to Same Port is enabled for the associated backend server group. 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, or HTTPS. Note: If the protocol of the backend server group is QUIC, the value can only be UDP_CONNECT. If the protocol of the backend server group is UDP, the value can only be UDP_CONNECT. If the protocol of the backend server group is TCP, the value can only be TCP, HTTP, or HTTPS. If the protocol of the backend server group is HTTP, the value can only be TCP, HTTP, or HTTPS. If the protocol of the backend server group is HTTPS, the value can only be TCP, HTTP, or HTTPS.
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 /. The value can contain letters, digits, hyphens (-), slashes (/), periods (.), percentage signs (%), question marks (?), pound signs (#), ampersand signs (&), and the extended character set _;~!()[]@$^:',+. Note: This parameter is available only when type* is set to HTTP or HTTPS. Default: / Minimum: 1 Maximum: 80

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 object	Specifies the health check.

**Table 6** HealthMonitor
Parameter	Type	Description
admin_state_up	Boolean	Specifies the administrative status of the health check. true (default) indicates that the health check is enabled. false indicates that the health check is disabled.
delay	Integer	Specifies the interval between health checks, in seconds. The value ranges from 1 to 50. Minimum: 1 Maximum: 50
domain_name	String	Specifies the domain name that HTTP requests are sent to during the health check. The value can contain only digits, letters, hyphens (-), and periods (.) and must start with a digit or letter. 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. This parameter is available only when type is set to HTTP.
expected_codes	String	Specifies the expected HTTP status code. This parameter will take effect only when type is set to HTTP or HTTPS. 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 The default value is 200. Multiple status codes can be queried in the format of expected_codes=xxx&expected_codes=xxx.
http_method	String	Specifies the HTTP method. The value can be GET, HEAD, POST, PUT, DELETE, TRACE, OPTIONS, CONNECT, or PATCH. The default value is GET. This parameter is available when type is set to HTTP or HTTPS. This parameter is unsupported. Please do not use it.
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. The value ranges from 1 to 10, and the default value is 3. Minimum: 1 Maximum: 10
monitor_port	Integer	Specifies the port used for the health check. If this parameter is left blank, a port of the backend server will be used by default. The port number ranges from 1 to 65535. Minimum: 1 Maximum: 65535
name	String	Specifies the health check name.
pools	Array of PoolRef objects	Lists the IDs of backend server groups for which the health check is configured. Only one ID will be returned.
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. The value can be TCP, UDP_CONNECT, HTTP, or HTTPS. Note: If the protocol of the backend server group is QUIC, the value can only be UDP_CONNECT. If the protocol of the backend server group is UDP, the value can only be UDP_CONNECT. If the protocol of the backend server group is TCP, the value can only be TCP, HTTP, or HTTPS. If the protocol of the backend server group is HTTP, the value can only be TCP, HTTP, or HTTPS. If the protocol of the backend server group is HTTPS, the value can only be TCP, HTTP, or HTTPS.
url_path	String	Specifies the HTTP request path for the health check. The value must start with a slash (/), and the default value is /. The value can contain letters, digits, hyphens (-), slashes (/), periods (.), percentage signs (%), question marks (?), pound signs (#), ampersand signs (&), and the extended character set _;~!()[]@$^:',+. Note: This parameter is available only when type* is set to HTTP or HTTPS.
created_at	String	Specifies the time when the health check was configured. The format is yyyy-MM-dd'T'HH:mm:ss'Z' (UTC time). This is a new field in this version, and it will not be returned for resources associated with existing dedicated load balancers and for resources associated with existing and new shared load balancers.
updated_at	String	Specifies the time when the health check was updated. The format is yyyy-MM-dd'T'HH:mm:ss'Z' (UTC time). This is a new field in this version, and it will not be returned for resources associated with existing dedicated load balancers and for resources associated with existing and new shared load balancers.

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

Example Requests

Configuring a health check whose protocol is HTTP

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

Normal response to POST requests.

{
  "request_id" : "0e837340-f1bd-4037-8f61-9923d0f0b19e",
  "healthmonitor" : {
    "monitor_port" : null,
    "id" : "c2b210b2-60c4-449d-91e2-9e9ea1dd7441",
    "project_id" : "99a3fff0d03c428eac3678da6a7d0f24",
    "domain_name" : null,
    "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"
  }
}