ListServerGroups - Server Load Balancer - Alibaba Cloud Documentation Center

Queries the server groups of a Network Load Balancer (NLB) instance.

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Test

RAM authorization

The table below describes the authorization required to call this API. You can define it in a Resource Access Management (RAM) policy. The table's columns are detailed below:

Action: The actions can be used in the Action element of RAM permission policy statements to grant permissions to perform the operation.
API: The API that you can call to perform the action.
Access level: The predefined level of access granted for each API. Valid values: create, list, get, update, and delete.
Resource type: The type of the resource that supports authorization to perform the action. It indicates if the action supports resource-level permission. The specified resource must be compatible with the action. Otherwise, the policy will be ineffective.
- For APIs with resource-level permissions, required resource types are marked with an asterisk (*). Specify the corresponding Alibaba Cloud Resource Name (ARN) in the Resource element of the policy.
- For APIs without resource-level permissions, it is shown as All Resources. Use an asterisk (*) in the Resource element of the policy.
Condition key: The condition keys defined by the service. The key allows for granular control, applying to either actions alone or actions associated with specific resources. In addition to service-specific condition keys, Alibaba Cloud provides a set of common condition keys applicable across all RAM-supported services.
Dependent action: The dependent actions required to run the action. To complete the action, the RAM user or the RAM role must have the permissions to perform all dependent actions.

Action

Access level

Resource type

Condition key

Dependent action

nlb:ListServerGroups

get

ServerGroup

acs:nlb:{#regionId}:{#accountId}:servergroup/*

ServerGroup

acs:nlb:{#regionId}:{#accountId}:servergroup/{#ServerGroupId}

None

Request parameters

Parameter	Type	Required	Description	Example
ServerGroupIds	array	No	The server group IDs. You can specify up to 20 server group IDs in each call.
	string	No	The server group ID. You can specify up to 20 server group IDs in each call.	sgp-atstuj3rtoptyui****
ServerGroupNames	array	No	The names of the server groups to be queried. You can specify up to 20 names in each call.
	string	No	The name of the server group to be queried. You can specify up to 20 names in each call.	NLB_ServerGroup
ResourceGroupId	string	No	The ID of the resource group to which the server group belongs.	rg-atstuj3rtop****
ServerGroupType	string	No	The type of server group. Valid values: Instance: allows you to add servers of the Ecs, Ens, and Eci types. Ip: allows you to add servers by specifying IP addresses.	Instance
VpcId	string	No	The ID of the virtual private cloud (VPC) in which the server group is deployed.	vpc-bp15zckdt37pq72zv****
Tag	array<object>	No	The tags.
	object	No	The tag.
Key	string	No	The key of the tag. You can specify up to 10 tag keys. The tag key can be up to 64 characters in length. It cannot start with `aliyun` or `acs:` and cannot contain `http://` or `https://`.	Test
Value	string	No	The value of the tag. You can specify up to 10 tag values. The tag value can be up to 128 characters in length. It cannot start with `aliyun` and `acs:`, and cannot contain `http://` or `https://`.	Test
NextToken	string	No	The pagination token used in the next request to retrieve a new page of results. Valid values: For the first request and last request, you do not need to specify this parameter. You must specify the token obtained from the previous query as the value of NextToken.	FFmyTO70tTpLG6I3FmYAXGKPd****
MaxResults	integer	No	The number of entries per page. Valid values: 1 to 100. Default value: 20.	20
RegionId	string	No	The region ID of the NLB instance. You can call the DescribeRegions operation to query the most recent region list.	cn-hangzhou

Response elements

Element	Type	Description	Example
	object	The operation to query server groups.
RequestId	string	The request ID.	54B28E3D-DF70-471B-AA93-08E683A1B45
ServerGroups	array<object>	A list of server groups.
	array<object>	The server group.
RegionId	string	The region ID of the NLB instance.	cn-hangzhou
ServerGroupId	string	The server group ID.	sgp-atstuj3rtoptyui****
ServerGroupName	string	The server group name.	NLB_ServerGroup
ServerGroupType	string	The type of server group. Valid values: Instance : contains servers of the Ecs, Ens, and Eci types. Ip: contains servers specified by IP addresses.	Instance
AddressIPVersion	string	The IP version. Valid values: ipv4 DualStack	ipv4
VpcId	string	The ID of the VPC to which the server group belongs.	vpc-bp15zckdt37pq72zv****
Scheduler	string	The routing algorithm. Valid values: Wrr: Backend servers with higher weights receive more requests than backend servers with lower weights. rr: Requests are forwarded to the backend servers in sequence. sch: Requests are forwarded to the backend servers based on source IP address hashing. sch: Requests from the same source IP address are forwarded to the same backend server. tch: Four-element hashing, which specifies consistent hashing that is based on four factors: source IP address, destination IP address, source port, and destination port. Requests that contain the same information based on the four factors are forwarded to the same backend server. qch: QUIC ID hashing. Requests that contain the same QUIC ID are forwarded to the same backend server.	Wrr
Protocol	string	The backend protocol. Valid values: TCP and UDP.	TCP
HealthCheck	object	The configurations of health checks.
HealthCheckEnabled	boolean	Indicates whether the health check feature is enabled. Valid values: true false	false
HealthCheckType	string	The protocol that is used for health checks. Valid values: TCP HTTP UDP	TCP
HealthCheckConnectPort	integer	The backend port that is used for health checks. Valid values: 0 to 65535. A value of 0 indicates that the port on a backend server is used for health checks.	200
HealthyThreshold	integer	The number of times that an unhealthy backend server must consecutively pass health checks before it is declared healthy. In this case, the health status changes from fail to success. Valid values: 2 to 10.	2
UnhealthyThreshold	integer	The number of times that a healthy backend server must consecutively fail health checks before it is declared unhealthy. In this case, the health status changes from success to fail. Valid values: 2 to 10.	3
HealthCheckConnectTimeout	integer	The maximum timeout period of a health check response. Unit: seconds. Default value: 5. Valid values: 1 to 300	200
HealthCheckInterval	integer	The interval at which health checks are performed. Unit: seconds. Default value: 5. If you set HealthCheckType to TCP or HTTP, valid values are 1 to 50. If you set HealthCheckType to UDP, valid values are 1 to 300. Set the health check interval equal to or larger than the response timeout period to ensure that UDP response timeouts are not determined as no responses.	10
HealthCheckDomain	string	The domain name that you want to use for health checks. Valid values: $SERVER_IP: the private IP address of a backend server. domain: a specified domain name. The domain name must be 1 to 80 characters in length, and can contain lowercase letters, digits, hyphens (-), and periods (.). Note This parameter takes effect only when HealthCheckType is set to HTTP.	$SERVER_IP
HealthCheckUrl	string	The path to which health check probes are sent. Note This parameter takes effect only when HealthCheckType is set to HTTP.	/test/index.html
HealthCheckHttpCode	array	The HTTP status codes returned for health checks. Multiple HTTP status codes are separated by commas (,). Valid values: http_2xx, http_3xx, http_4xx, and http_5xx. Note This parameter takes effect only when HealthCheckType is set to HTTP.
	string	The HTTP status codes returned for health checks. Multiple HTTP status codes are separated by commas (,). Valid values: http_2xx, http_3xx, http_4xx, and http_5xx. Note This parameter takes effect only when HealthCheckType is set to HTTP.	http_2xx
HttpCheckMethod	string	The HTTP method that is used for health checks. Valid values: GET and HEAD. Note This parameter takes effect only when HealthCheckType is set to HTTP.	GET
HealthCheckReq	string	The request string of UDP health checks. The string must be 1 to 512 characters in length, and can contain letters and digits.	hello
HealthCheckExp	string	The response string of UDP health checks. The string must be 1 to 512 characters in length, and can contain letters and digits.	ok
HealthCheckHttpVersion	string	The version of the HTTP protocol. Valid values: HTTP1.0 and HTTP1.1. Note This parameter takes effect only if you set HealthCheckType to HTTP.	HTTP1.0
ConnectionDrainEnabled	boolean	Indicates whether connection draining is enabled. Valid values: true false	false
ConnectionDrainTimeout	integer	The timeout period of connection draining. Unit: seconds. Valid values: 10 to 900.	200
PreserveClientIpEnabled	boolean	Indicates whether client IP preservation is enabled. Valid values: true false Note This parameter is set to true by default when AddressIPVersion is set to ipv4. This parameter is set to false when AddressIPVersion is set to ipv6. true will be supported by later versions.	true
AnyPortEnabled	boolean	Indicates whether the feature of forwarding requests to all ports is enabled. Valid values: true false	false
ResourceGroupId	string	The ID of the resource group to which the server group belongs.	rg-atstuj3rtop****
ServerGroupStatus	string	The status of the server group. Valid values: Creating Available Configuring	Available
AliUid	integer	The ID of the Alibaba Cloud account.	165820696622****
Tags	array<object>	The tag.
	object	The tags.
Key	string	The tag key. At most 10 tag keys are returned. The tag key can be up to 64 characters in length, and cannot contain `http://` or `https://`. It cannot start with `aliyun` or `acs:`.	Test
Value	string	The tag value. At most 10 tag values are returned. The tag value can be up to 128 characters in length, and cannot contain `http://` or `https://`. It cannot start with `aliyun` or `acs:`.	Test
RelatedLoadBalancerIds	array	The NLB instances.
	string	A list of NLB instances.	nlb-83ckzc8d4xlp8o****
ServerCount	integer	The number of server groups associated with the NLB instances.	2
TotalCount	integer	The total number of entries returned.	1
NextToken	string	A pagination token. It can be used in the next request to retrieve a new page of results. Valid values: If NextToken is empty, no next page exists. If a value is returned for NextToken, the value is the token that determines the start point of the next query.	FFmyTO70tTpLG6I3FmYAXGKPd****
MaxResults	integer	The number of entries per page. Valid values: 1 to 100.	20

Examples

Success response

JSON format

{
  "RequestId": "54B28E3D-DF70-471B-AA93-08E683A1B45",
  "ServerGroups": [
    {
      "RegionId": "cn-hangzhou",
      "ServerGroupId": "sgp-atstuj3rtoptyui****",
      "ServerGroupName": "NLB_ServerGroup",
      "ServerGroupType": "Instance",
      "AddressIPVersion": "ipv4",
      "VpcId": "vpc-bp15zckdt37pq72zv****",
      "Scheduler": "Wrr",
      "Protocol": "TCP",
      "HealthCheck": {
        "HealthCheckEnabled": false,
        "HealthCheckType": "TCP",
        "HealthCheckConnectPort": 200,
        "HealthyThreshold": 2,
        "UnhealthyThreshold": 3,
        "HealthCheckConnectTimeout": 200,
        "HealthCheckInterval": 10,
        "HealthCheckDomain": "$SERVER_IP",
        "HealthCheckUrl": "/test/index.html",
        "HealthCheckHttpCode": [
          "http_2xx"
        ],
        "HttpCheckMethod": "GET",
        "HealthCheckReq": "hello",
        "HealthCheckExp": "ok",
        "HealthCheckHttpVersion": "HTTP1.0"
      },
      "ConnectionDrainEnabled": false,
      "ConnectionDrainTimeout": 200,
      "PreserveClientIpEnabled": true,
      "AnyPortEnabled": false,
      "ResourceGroupId": "rg-atstuj3rtop****",
      "ServerGroupStatus": "Available",
      "AliUid": 0,
      "Tags": [
        {
          "Key": "Test",
          "Value": "Test"
        }
      ],
      "RelatedLoadBalancerIds": [
        "nlb-83ckzc8d4xlp8o****"
      ],
      "ServerCount": 2
    }
  ],
  "TotalCount": 1,
  "NextToken": "FFmyTO70tTpLG6I3FmYAXGKPd****",
  "MaxResults": 20
}

Error codes

HTTP status code	Error code	Error message	Description
400	SystemBusy	System is busy, please try again later.
403	Forbidden.%s	Authentication is failed for %s.
403	Forbidden.NoPermission	Authentication is failed for NoPermission.	Authentication is failed for NoPermission.

See Error Codes for a complete list.

Release notes

See Release Notes for a complete list.