Updated on 2026-09-15 GMT+08:00

Querying a Host List - ListHosts

Function

This API is used to query the host list details of a specified MRS cluster, including the host name, IP address, node type, and running status, for cluster operations and troubleshooting.

Constraints

None

Debugging

You can debug this API in API Explorer, which supports automatic authentication and authorization. API Explorer can automatically generate sample SDK code and supports sample SDK code debugging.

Authorization Information

Each account has all the permissions required to call all APIs, but IAM users must be assigned the required permissions.

  • If you are using role/policy-based authorization, see Permissions Policies and Supported Actions for details on the required permissions.
  • If you are using identity policy-based authorization, no identity policy-based permissions are required for calling this API.

URI

  • Format

    GET /v1.1/{project_id}/clusters/{cluster_id}/hosts

  • Parameter description
    Table 1 URI parameters

    Parameter

    Mandatory

    Type

    Description

    project_id

    Yes

    String

    Definition

    Project ID. For details about how to obtain the project ID, see Obtaining a Project ID.

    Constraints

    N/A

    Range

    The value must consist of 1 to 64 characters. Only letters and digits are allowed.

    Default Value

    N/A

    cluster_id

    Yes

    String

    Definition

    Cluster ID For details about how to obtain the cluster ID, see Obtaining a Cluster ID.

    Constraints

    N/A

    Range

    The value can contain 1 to 64 characters, including only letters, digits, underscores (_), and hyphens (-).

    Default Value

    N/A

    Table 2 Query parameters

    Parameter

    Mandatory

    Type

    Description

    pageSize

    No

    Integer

    Definition

    Maximum number of clusters displayed on a page.

    Constraints

    N/A

    Range

    1-2147483646

    Default Value

    10

    currentPage

    No

    Integer

    Definition

    Current page number.

    Constraints

    N/A

    Range

    N/A

    Default Value

    N/A

Request Parameters

None

Response Parameters

Status code: 200

Table 3 Response body parameters

Parameter

Type

Description

total

Integer

Definition

Host parameters.

Range

N/A

hosts

Array of HostModel objects

Definition

Host list information, containing detailed information about each host in the cluster. For detailed parameter descriptions, see the parameter details list in Table 4.

Range

N/A

Table 4 HostModel

Parameter

Type

Description

id

String

Definition

VM ID.

Range

N/A

name

String

Definition

VM name.

Range

N/A

ip

String

Definition

VM IP address.

Range

N/A

availability_zone_id

String

Definition

Availability zone.

Range

N/A

tags

Array of TagPlain objects

Definition

The tag list. For details, see Table 5.

Range

N/A

status

String

Definition

Current VM status, which is ACTIVE under normal conditions.

Range

  • ACTIVE: The VM is running.

  • STARTED: The VM is running (a state of ACTIVE).

  • SHUTOFF: The VM is stopped.

  • ERROR: The VM is faulty.

  • BUILD: The VM is being created.

  • DELETED: The VM has been deleted.

  • DELETING: The VM is being deleted.

  • STOPPING: The VM is being stopped.

  • ATTACHED: The VM has been de-isolated.

  • DETACHED: The VM has been isolated.

  • DETACH_FAIL: The VM fails to be isolated.

  • UNKNOWN: The VM status is unknown.

  • SCALING_UP: The VM specifications are being upgraded.

  • DECOMMISSIONING: The node is being decommissioned.

  • DECOMMISSIONED: The node has been decommissioned.

  • VOLUMES_EXPANDING: The disk capacity is being expanded.

resource_id

String

Definition

Node resource ID.

Range

N/A

flavor

String

Definition

VM specification ID.

Range

N/A

type

String

Definition

VM type. The value can be MasterNode, CoreNode, or TaskNode.

Range

  • MasterNode: Master node
  • CoreNode: Core node
  • TaskNode: Task node

mem

String

Definition

Memory, in GB.

Range

N/A

cpu

String

Definition

Number of CPU cores.

Range

N/A

root_volume_size

String

Definition

OS disk capacity, in GB.

Range

N/A

data_volume_type

String

Definition

Data disk type.

Range

SATA: common I/O

SAS: high I/O

SSD: ultra-high I/O

data_volume_size

Integer

Definition

Data disk capacity, in GB.

Range

N/A

data_volume_count

Integer

Definition

Number of data disks.

Range

N/A

node_group_name

String

Definition

Node group name.

Range

N/A

Table 5 TagPlain parameters

Parameter

Type

Description

key

String

Definition

Tag key.

Range

A tag key can contain letters, digits, spaces, and special characters _.:=+-@, but cannot start or end with a space or start with _sys_.

value

String

Definition

Tag value.

Range

The value can contain letters, digits, spaces, and special characters _.:=+-@, but cannot start or end with a space or start with _sys_.

Example Request

GET /v1.1/{project_id}/clusters/{cluster_id}/hosts

Example Response

Status code: 200

Querying the host list is successful.

{
  "total" : "5",
  "hosts" : [ {
    "id" : "063d1d47-ae91-4a48-840c-b3cfe4efbcf0",
    "name" : "a78e161c-d14f-4b68-8c2d-0219920ce844_node_core_IQhiC",
    "ip" : "192.168.0.169",
    "availability_zone_id" : null,
    "tags" : null,
    "status" : "ACTIVE",
    "resource_id" : "95c1eabc-ed1d-4037-97d1-62f0587790c7",
    "flavor" : "c2.2xlarge.linux.mrs",
    "type" : "Core",
    "mem" : "16384",
    "cpu" : "8",
    "root_volume_size" : "480",
    "data_volume_type" : "SATA",
    "data_volume_size" : "600",
    "data_volume_count" : "1",
    "node_group_name" : "node_group_1"
  }, {
    "id" : "dc5c6208-faa2-4727-a65a-2b1ce235d350",
    "name" : "a78e161c-d14f-4b68-8c2d-0219920ce844_node_master1_ASzkl",
    "ip" : "192.168.0.156",
    "availability_zone_id" : null,
    "tags" : null,
    "status" : "ACTIVE",
    "resource_id" : "95c1eabc-ed1d-4037-97d1-62f0587790c7",
    "flavor" : "c2.4xlarge.linux.mrs",
    "type" : "Master",
    "mem" : "32768",
    "cpu" : "16",
    "root_volume_size" : "480",
    "data_volume_type" : "SATA",
    "data_volume_size" : "600",
    "data_volume_count" : "1",
    "node_group_name" : "master_node_default_group"
  }, {
    "id" : "c0ce793d-848b-448a-835b-ea0cac534b09",
    "name" : "a78e161c-d14f-4b68-8c2d-0219920ce844_node_core_ANnRN",
    "ip" : "192.168.0.243",
    "availability_zone_id" : null,
    "tags" : null,
    "status" : "ACTIVE",
    "resource_id" : "95c1eabc-ed1d-4037-97d1-62f0587790c7",
    "flavor" : "c2.2xlarge.linux.mrs",
    "type" : "Core",
    "mem" : "16384",
    "cpu" : "8",
    "root_volume_size" : "480",
    "data_volume_type" : "SATA",
    "data_volume_size" : "600",
    "data_volume_count" : "1",
    "node_group_name" : "node_group_1"
  }, {
    "id" : "95c23e43-ef6e-4732-b6ed-a5f1c7779fae",
    "name" : "a78e161c-d14f-4b68-8c2d-0219920ce844_node_core_uRRiA",
    "ip" : "192.168.0.126",
    "availability_zone_id" : null,
    "tags" : null,
    "status" : "ACTIVE",
    "resource_id" : "95c1eabc-ed1d-4037-97d1-62f0587790c7",
    "flavor" : "c2.2xlarge.linux.mrs",
    "type" : "Core",
    "mem" : "16384",
    "cpu" : "8",
    "root_volume_size" : "480",
    "data_volume_type" : "SATA",
    "data_volume_size" : "600",
    "data_volume_count" : "1",
    "node_group_name" : "node_group_1"
  }, {
    "id" : "63bdbf75-1133-4a94-8c27-1fa12c8b9e70",
    "name" : "a78e161c-d14f-4b68-8c2d-0219920ce844_node_master2_StqFu",
    "ip" : "192.168.0.22",
    "availability_zone_id" : null,
    "tags" : null,
    "status" : "ACTIVE",
    "resource_id" : "95c1eabc-ed1d-4037-97d1-62f0587790c7",
    "flavor" : "c2.4xlarge.linux.mrs",
    "type" : "Master",
    "mem" : "32768",
    "cpu" : "16",
    "root_volume_size" : "480",
    "data_volume_type" : "SATA",
    "data_volume_size" : "600",
    "data_volume_count" : "1",
    "node_group_name" : "master_node_default_group"
  } ]
}

SDK Sample Code

The SDK sample code is as follows.

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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.mrs.v1.region.MrsRegion;
import com.huaweicloud.sdk.mrs.v1.*;
import com.huaweicloud.sdk.mrs.v1.model.*;


public class ListHostsSolution {

    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);

        MrsClient client = MrsClient.newBuilder()
                .withCredential(auth)
                .withRegion(MrsRegion.valueOf("<YOUR REGION>"))
                .build();
        ListHostsRequest request = new ListHostsRequest();
        request.withClusterId("{cluster_id}");
        try {
            ListHostsResponse response = client.listHosts(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());
        }
    }
}
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# coding: utf-8

import os
from huaweicloudsdkcore.auth.credentials import BasicCredentials
from huaweicloudsdkmrs.v1.region.mrs_region import MrsRegion
from huaweicloudsdkcore.exceptions import exceptions
from huaweicloudsdkmrs.v1 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 = MrsClient.new_builder() \
        .with_credentials(credentials) \
        .with_region(MrsRegion.value_of("<YOUR REGION>")) \
        .build()

    try:
        request = ListHostsRequest()
        request.cluster_id = "{cluster_id}"
        response = client.list_hosts(request)
        print(response)
    except exceptions.ClientRequestException as e:
        print(e.status_code)
        print(e.request_id)
        print(e.error_code)
        print(e.error_msg)
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package main

import (
	"fmt"
	"github.com/huaweicloud/huaweicloud-sdk-go-v3/core/auth/basic"
    mrs "github.com/huaweicloud/huaweicloud-sdk-go-v3/services/mrs/v1"
	"github.com/huaweicloud/huaweicloud-sdk-go-v3/services/mrs/v1/model"
    region "github.com/huaweicloud/huaweicloud-sdk-go-v3/services/mrs/v1/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 := mrs.NewMrsClient(
        mrs.MrsClientBuilder().
            WithRegion(region.ValueOf("<YOUR REGION>")).
            WithCredential(auth).
            Build())

    request := &model.ListHostsRequest{}
	request.ClusterId = "{cluster_id}"
	response, err := client.ListHosts(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

Table 6 Status code

Status Code

Description

200

The host list has been queried.

Error Codes

See Error Codes.