Java Cloud Computing Practice: Using Huawei Cloud ECS to Build a Virtualized Environment

Java Cloud Computing Practice: Use Huawei Cloud ECS to build a virtualized environment

Introduction:
Cloud computing is an important trend in today's Internet technology. It combines computing resources, storage resources and network resources. Wait for virtualization and provide it to users through the Internet. Huawei Cloud is a leading cloud service provider, providing a powerful cloud computing platform. This article will introduce how to use the Java programming language and Huawei Cloud ECS (elastic cloud server) to build a virtualized environment.

Part One: Environment Preparation

1. Register a Huawei Cloud account and activate the ECS service. Go to the official Huawei Cloud website (https://www.huaweicloud.com) to complete account registration, activate the ECS service, and obtain the access key.
2. Install the Java development environment. Make sure the JDK is installed on the computer and the JAVA_HOME environment variable is set.

Part 2: Connect to Huawei Cloud using Java SDK

1. Create a new Java project and introduce Huawei Cloud Java SDK. You can download the Java SDK from the Developer Resource Center on the official Huawei Cloud website and add the relevant jar files to the project's build path.

2. Import the packages required by the SDK in the code.

   import com.huaweicloud.sdk.core.auth.BasicCredentials;
   import com.huaweicloud.sdk.ecs.v2.EcsClient;
   import com.huaweicloud.sdk.ecs.v2.model.*;

3. Set the Huawei Cloud access key.

   String ak = "your-access-key";
   String sk = "your-secret-key";
   String projectId = "your-project-id";
   BasicCredentials credentials = new BasicCredentials()
    .withAk(ak)
    .withSk(sk)
    .withProjectId(projectId);

4. Create the ECS client object and authenticate.

   EcsClient ecsClient = EcsClient.newBuilder()
    .withCredential(credentials)
    .withEndpoint("https://ecs.cn-north-1.myhuaweicloud.com")
    .build();

Part 3: Create and manage virtual machine instances

1. Create virtual machine instances.

   String imageId = "your-image-id";
   String flavorId = "your-flavor-id";
   String vpcId = "your-vpc-id";
   String subnetId = "your-subnet-id";
   String securityGroupId = "your-security-group-id";
   
   CreatePostPaidServersRequest request = new CreatePostPaidServersRequest()
    .withFlavorRef(flavorId)
    .withImageRef(imageId)
    .withName("my-vm")
    .withVpcId(vpcId)
    .withRootVolume(
        new PostPaidServerRootVolume()
            .withVolumetype("SATA")
            .withSize(40)
    )
    .withDataVolumes(
        Arrays.asList(
            new PostPaidServerDataVolume()
                .withVolumetype("SATA")
                .withSize(100)
        )
    )
    .withAvailabilityZone("cn-north-1b")
    .withAdminPass("your-vm-password")
    .withCount(1)
    .withPublicip(
        new PostPaidServerPublicip()
            .withEip(
                new PostPaidServerEip()
                    .withIptype("5_bgp")
            )
    )
    .withServerTags(
        Arrays.asList(
            new PostPaidServerTag()
                .withKey("key1")
                .withValue("value1"),
            new PostPaidServerTag()
                .withKey("key2")
                .withValue("value2")
        )
    )
    .withSubnetId(subnetId)
    .withSecurityGroupId(securityGroupId);
   
   CreatePostPaidServersResponse response = ecsClient.createPostPaidServers(request);

2. Query the virtual machine instance list.

   ListServersDetailsRequest request = new ListServersDetailsRequest()
    .withLimit(10);
   
   ListServersDetailsResponse response = ecsClient.listServersDetails(request);
   List<ListServersDetailsResult> servers = response.getServers();
   for (ListServersDetailsResult server : servers) {
    System.out.println("虚拟机实例ID：" + server.getId());
    System.out.println("虚拟机名称：" + server.getName());
    System.out.println("虚拟机状态：" + server.getStatus());
    System.out.println("-----------------------");
   }

Part 4: Summary
Through this article, we learned how to use the Java programming language and Huawei Cloud ECS to build a virtualized environment. We learned how to connect to Huawei Cloud and how to create and manage virtual machine instances. The above sample code is for demonstration only. In actual use, you need to configure the corresponding parameters according to your own needs.

References:

• Huawei Cloud Developer Resource Center: https://support.huaweicloud.com/developer-resourcecenter/

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