Configuring a Health Check
Function
This API is used to configure a health check.
Constraints
Note the following:
-
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
Parameter |
Mandatory |
Type |
Description |
---|---|---|---|
project_id |
Yes |
String |
Specifies the project ID. |
Request Parameters
Parameter |
Mandatory |
Type |
Description |
---|---|---|---|
X-Auth-Token |
Yes |
String |
Specifies the token used for IAM authentication. |
Parameter |
Mandatory |
Type |
Description |
---|---|---|---|
healthmonitor |
Yes |
CreateHealthMonitorOption object |
Specifies the health check. |
Parameter |
Mandatory |
Type |
Description |
---|---|---|---|
admin_state_up |
No |
Boolean |
Specifies the administrative status of the health check. The value can be:
|
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 or HTTPS. |
expected_codes |
No |
String |
Specifies the expected HTTP status code. The value options are as follows:
If type is set to gRPC, the default value is 0. If type is set to other protocols, the default value is 200. This parameter will take effect only when type is set to HTTP, HTTPS or gRPC. |
http_method |
No |
String |
Specifies the HTTP method. The value can be GET, HEAD, or POST. 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. |
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. |
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. |
monitor_port |
No |
Integer |
Specifies the port used for the health check. This parameter is left blank by default, indicating that a port of the backend server will be used by default. The port number ranges from 1 to 65535.
NOTE:
This parameter is mandatory if any_port_enable is set to true for a backend server group. |
name |
No |
String |
Specifies the health check name. |
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. |
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. |
type |
Yes |
String |
Specifies the health check protocol. The value can be TCP, UDP_CONNECT, HTTP, HTTPS, gRPC, or TLS. Note:
|
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. |
Response Parameters
Status code: 201
Parameter |
Type |
Description |
---|---|---|
request_id |
String |
Specifies the request ID. Note: The value is automatically generated. |
healthmonitor |
HealthMonitor object |
Specifies the health check. |
Parameter |
Type |
Description |
---|---|---|
admin_state_up |
Boolean |
Specifies the administrative status of the health check. The value can be:
|
delay |
Integer |
Specifies the interval between health checks, in seconds. The value ranges from 1 to 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 or HTTPS. |
expected_codes |
String |
Specifies the expected HTTP status code. The value options are as follows:
If type is set to gRPC, the default value is 0. If type is set to other protocols, the default value is 200. This parameter will take effect only when type is set to HTTP, HTTPS or gRPC. |
http_method |
String |
Specifies the HTTP method. The value can be GET, HEAD, or POST. 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. |
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. |
monitor_port |
Integer |
Specifies the port used for the health check. This parameter is left blank by default, indicating that a port of the backend server will be used by default. The port number ranges from 1 to 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. |
type |
String |
Specifies the health check protocol. The value can be TCP, UDP_CONNECT, HTTP, HTTPS, gRPC or TLS. Note:
|
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. |
Example Requests
-
Configuring a health check for an HTTP backend server group
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 2: Configuring a health check for an IP backend server group
{ "healthmonitor" : { "name" : "My Healthmonitor", "max_retries" : 3, "pool_id" : "488acc50-6bcf-423d-8f0a-0f4184f5b8a0", "type" : "HTTP", "timeout" : 30, "delay" : 1, "port" : 80 } }
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" } }
SDK Sample Code
The SDK sample code is as follows.
-
Configuring a health check for an HTTP backend server group
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package com.huaweicloud.sdk.test; import com.huaweicloud.sdk.core.auth.ICredential; import com.huaweicloud.sdk.core.auth.BasicCredentials; import com.huaweicloud.sdk.core.exception.ConnectionException; import com.huaweicloud.sdk.core.exception.RequestTimeoutException; import com.huaweicloud.sdk.core.exception.ServiceResponseException; import com.huaweicloud.sdk.elb.v3.region.ElbRegion; import com.huaweicloud.sdk.elb.v3.*; import com.huaweicloud.sdk.elb.v3.model.*; public class CreateHealthMonitorSolution { public static void main(String[] args) { // The AK and SK used for authentication are hard-coded or stored in plaintext, which has great security risks. It is recommended that the AK and SK be stored in ciphertext in configuration files or environment variables and decrypted during use to ensure security. // In this example, AK and SK are stored in environment variables for authentication. Before running this example, set environment variables CLOUD_SDK_AK and CLOUD_SDK_SK in the local environment String ak = System.getenv("CLOUD_SDK_AK"); String sk = System.getenv("CLOUD_SDK_SK"); String projectId = "{project_id}"; ICredential auth = new BasicCredentials() .withProjectId(projectId) .withAk(ak) .withSk(sk); ElbClient client = ElbClient.newBuilder() .withCredential(auth) .withRegion(ElbRegion.valueOf("<YOUR REGION>")) .build(); CreateHealthMonitorRequest request = new CreateHealthMonitorRequest(); CreateHealthMonitorRequestBody body = new CreateHealthMonitorRequestBody(); CreateHealthMonitorOption healthmonitorbody = new CreateHealthMonitorOption(); healthmonitorbody.withDelay(1) .withMaxRetries(3) .withName("My Healthmonitor") .withPoolId("488acc50-6bcf-423d-8f0a-0f4184f5b8a0") .withTimeout(30) .withType("HTTP"); body.withHealthmonitor(healthmonitorbody); request.withBody(body); try { CreateHealthMonitorResponse response = client.createHealthMonitor(request); System.out.println(response.toString()); } catch (ConnectionException e) { e.printStackTrace(); } catch (RequestTimeoutException e) { e.printStackTrace(); } catch (ServiceResponseException e) { e.printStackTrace(); System.out.println(e.getHttpStatusCode()); System.out.println(e.getRequestId()); System.out.println(e.getErrorCode()); System.out.println(e.getErrorMsg()); } } }
-
Example 2: Configuring a health check for an IP backend server group
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package com.huaweicloud.sdk.test; import com.huaweicloud.sdk.core.auth.ICredential; import com.huaweicloud.sdk.core.auth.BasicCredentials; import com.huaweicloud.sdk.core.exception.ConnectionException; import com.huaweicloud.sdk.core.exception.RequestTimeoutException; import com.huaweicloud.sdk.core.exception.ServiceResponseException; import com.huaweicloud.sdk.elb.v3.region.ElbRegion; import com.huaweicloud.sdk.elb.v3.*; import com.huaweicloud.sdk.elb.v3.model.*; public class CreateHealthMonitorSolution { public static void main(String[] args) { // The AK and SK used for authentication are hard-coded or stored in plaintext, which has great security risks. It is recommended that the AK and SK be stored in ciphertext in configuration files or environment variables and decrypted during use to ensure security. // In this example, AK and SK are stored in environment variables for authentication. Before running this example, set environment variables CLOUD_SDK_AK and CLOUD_SDK_SK in the local environment String ak = System.getenv("CLOUD_SDK_AK"); String sk = System.getenv("CLOUD_SDK_SK"); String projectId = "{project_id}"; ICredential auth = new BasicCredentials() .withProjectId(projectId) .withAk(ak) .withSk(sk); ElbClient client = ElbClient.newBuilder() .withCredential(auth) .withRegion(ElbRegion.valueOf("<YOUR REGION>")) .build(); CreateHealthMonitorRequest request = new CreateHealthMonitorRequest(); CreateHealthMonitorRequestBody body = new CreateHealthMonitorRequestBody(); CreateHealthMonitorOption healthmonitorbody = new CreateHealthMonitorOption(); healthmonitorbody.withDelay(1) .withMaxRetries(3) .withName("My Healthmonitor") .withPoolId("488acc50-6bcf-423d-8f0a-0f4184f5b8a0") .withTimeout(30) .withType("HTTP"); body.withHealthmonitor(healthmonitorbody); request.withBody(body); try { CreateHealthMonitorResponse response = client.createHealthMonitor(request); System.out.println(response.toString()); } catch (ConnectionException e) { e.printStackTrace(); } catch (RequestTimeoutException e) { e.printStackTrace(); } catch (ServiceResponseException e) { e.printStackTrace(); System.out.println(e.getHttpStatusCode()); System.out.println(e.getRequestId()); System.out.println(e.getErrorCode()); System.out.println(e.getErrorMsg()); } } }
-
Configuring a health check for an HTTP backend server group
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42
# coding: utf-8 import os from huaweicloudsdkcore.auth.credentials import BasicCredentials from huaweicloudsdkelb.v3.region.elb_region import ElbRegion from huaweicloudsdkcore.exceptions import exceptions from huaweicloudsdkelb.v3 import * if __name__ == "__main__": # The AK and SK used for authentication are hard-coded or stored in plaintext, which has great security risks. It is recommended that the AK and SK be stored in ciphertext in configuration files or environment variables and decrypted during use to ensure security. # In this example, AK and SK are stored in environment variables for authentication. Before running this example, set environment variables CLOUD_SDK_AK and CLOUD_SDK_SK in the local environment ak = os.environ["CLOUD_SDK_AK"] sk = os.environ["CLOUD_SDK_SK"] projectId = "{project_id}" credentials = BasicCredentials(ak, sk, projectId) client = ElbClient.new_builder() \ .with_credentials(credentials) \ .with_region(ElbRegion.value_of("<YOUR REGION>")) \ .build() try: request = CreateHealthMonitorRequest() healthmonitorbody = CreateHealthMonitorOption( delay=1, max_retries=3, name="My Healthmonitor", pool_id="488acc50-6bcf-423d-8f0a-0f4184f5b8a0", timeout=30, type="HTTP" ) request.body = CreateHealthMonitorRequestBody( healthmonitor=healthmonitorbody ) response = client.create_health_monitor(request) print(response) except exceptions.ClientRequestException as e: print(e.status_code) print(e.request_id) print(e.error_code) print(e.error_msg)
-
Example 2: Configuring a health check for an IP backend server group
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42
# coding: utf-8 import os from huaweicloudsdkcore.auth.credentials import BasicCredentials from huaweicloudsdkelb.v3.region.elb_region import ElbRegion from huaweicloudsdkcore.exceptions import exceptions from huaweicloudsdkelb.v3 import * if __name__ == "__main__": # The AK and SK used for authentication are hard-coded or stored in plaintext, which has great security risks. It is recommended that the AK and SK be stored in ciphertext in configuration files or environment variables and decrypted during use to ensure security. # In this example, AK and SK are stored in environment variables for authentication. Before running this example, set environment variables CLOUD_SDK_AK and CLOUD_SDK_SK in the local environment ak = os.environ["CLOUD_SDK_AK"] sk = os.environ["CLOUD_SDK_SK"] projectId = "{project_id}" credentials = BasicCredentials(ak, sk, projectId) client = ElbClient.new_builder() \ .with_credentials(credentials) \ .with_region(ElbRegion.value_of("<YOUR REGION>")) \ .build() try: request = CreateHealthMonitorRequest() healthmonitorbody = CreateHealthMonitorOption( delay=1, max_retries=3, name="My Healthmonitor", pool_id="488acc50-6bcf-423d-8f0a-0f4184f5b8a0", timeout=30, type="HTTP" ) request.body = CreateHealthMonitorRequestBody( healthmonitor=healthmonitorbody ) response = client.create_health_monitor(request) print(response) except exceptions.ClientRequestException as e: print(e.status_code) print(e.request_id) print(e.error_code) print(e.error_msg)
-
Configuring a health check for an HTTP backend server group
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49
package main import ( "fmt" "github.com/huaweicloud/huaweicloud-sdk-go-v3/core/auth/basic" elb "github.com/huaweicloud/huaweicloud-sdk-go-v3/services/elb/v3" "github.com/huaweicloud/huaweicloud-sdk-go-v3/services/elb/v3/model" region "github.com/huaweicloud/huaweicloud-sdk-go-v3/services/elb/v3/region" ) func main() { // The AK and SK used for authentication are hard-coded or stored in plaintext, which has great security risks. It is recommended that the AK and SK be stored in ciphertext in configuration files or environment variables and decrypted during use to ensure security. // In this example, AK and SK are stored in environment variables for authentication. Before running this example, set environment variables CLOUD_SDK_AK and CLOUD_SDK_SK in the local environment ak := os.Getenv("CLOUD_SDK_AK") sk := os.Getenv("CLOUD_SDK_SK") projectId := "{project_id}" auth := basic.NewCredentialsBuilder(). WithAk(ak). WithSk(sk). WithProjectId(projectId). Build() client := elb.NewElbClient( elb.ElbClientBuilder(). WithRegion(region.ValueOf("<YOUR REGION>")). WithCredential(auth). Build()) request := &model.CreateHealthMonitorRequest{} nameHealthmonitor:= "My Healthmonitor" healthmonitorbody := &model.CreateHealthMonitorOption{ Delay: int32(1), MaxRetries: int32(3), Name: &nameHealthmonitor, PoolId: "488acc50-6bcf-423d-8f0a-0f4184f5b8a0", Timeout: int32(30), Type: "HTTP", } request.Body = &model.CreateHealthMonitorRequestBody{ Healthmonitor: healthmonitorbody, } response, err := client.CreateHealthMonitor(request) if err == nil { fmt.Printf("%+v\n", response) } else { fmt.Println(err) } }
-
Example 2: Configuring a health check for an IP backend server group
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49
package main import ( "fmt" "github.com/huaweicloud/huaweicloud-sdk-go-v3/core/auth/basic" elb "github.com/huaweicloud/huaweicloud-sdk-go-v3/services/elb/v3" "github.com/huaweicloud/huaweicloud-sdk-go-v3/services/elb/v3/model" region "github.com/huaweicloud/huaweicloud-sdk-go-v3/services/elb/v3/region" ) func main() { // The AK and SK used for authentication are hard-coded or stored in plaintext, which has great security risks. It is recommended that the AK and SK be stored in ciphertext in configuration files or environment variables and decrypted during use to ensure security. // In this example, AK and SK are stored in environment variables for authentication. Before running this example, set environment variables CLOUD_SDK_AK and CLOUD_SDK_SK in the local environment ak := os.Getenv("CLOUD_SDK_AK") sk := os.Getenv("CLOUD_SDK_SK") projectId := "{project_id}" auth := basic.NewCredentialsBuilder(). WithAk(ak). WithSk(sk). WithProjectId(projectId). Build() client := elb.NewElbClient( elb.ElbClientBuilder(). WithRegion(region.ValueOf("<YOUR REGION>")). WithCredential(auth). Build()) request := &model.CreateHealthMonitorRequest{} nameHealthmonitor:= "My Healthmonitor" healthmonitorbody := &model.CreateHealthMonitorOption{ Delay: int32(1), MaxRetries: int32(3), Name: &nameHealthmonitor, PoolId: "488acc50-6bcf-423d-8f0a-0f4184f5b8a0", Timeout: int32(30), Type: "HTTP", } request.Body = &model.CreateHealthMonitorRequestBody{ Healthmonitor: healthmonitorbody, } response, err := client.CreateHealthMonitor(request) if err == nil { fmt.Printf("%+v\n", response) } else { fmt.Println(err) } }
For SDK sample code of more programming languages, see the Sample Code tab in API Explorer. SDK sample code can be automatically generated.
Status Codes
Status Code |
Description |
---|---|
201 |
Normal response to POST requests. |
Error Codes
See Error Codes.
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