Create a cluster registration proxy and register an on-premises cluster

Container Service for Kubernetes (ACK) allows you to create a cluster registration proxy and use the proxy to register a Kubernetes cluster that is deployed in a data center or on a third-party cloud. This allows you to manage your clusters in the ACK console in a centralized manner. This topic describes how to create a cluster registration proxy and register a Kubernetes cluster that is deployed in a data center.

1. Create a cluster registration proxy.
   1. Log on to the ACK console.
   2. In the left-side navigation pane, click Clusters.
   3. On the Clusters page, click Create Kubernetes Cluster in the upper-right corner of the page.
   4. On the Register Cluster tab, set the parameters.

      Parameter	Description
      Cluster Name	Enter a name for the ACK cluster. Note The name must be 1 to 63 characters in length, and can contain digits, letters, and hyphens (-).
      Resource Group	Move the pointer over All Resources at the top of the page and select the resource group to which the cluster belongs. The name of the selected resource group is displayed, as shown in the following figure.
      Region	Select a region to deploy the cluster.
      VPC	Select a virtual private cloud (VPC) from the drop-down list.
      VSwitch	Select a node vSwitch that belongs to the VPC that you selected.
      Network Plug-in	If you select Disable, node pools are not used to scale computing resources. In this case, network plug-ins are not required.
      	If you select Terway and IPVLAN, IPVLAN and eBPF are combined to implement NIC virtualization and sharing. In this case, you must use the Alibaba Cloud Linux 2 operating system.
      Pod VSwitch	Select a pod vSwitch that belongs to the VPC that you selected.
      Service CIDR	Use the default value 172.21.0.0/20.
      Access to API Server	By default, an internal-facing Server Load Balancer (SLB) instance is created for the cluster API server. You can modify the specifications of the SLB instance. For more information, see Instance types and specifications. Notice If you delete the SLB instance, you cannot access the API server.
      EIP	Specify whether to associate an elastic IP address (EIP) with the cluster. If you select this check box, an EIP is automatically created and associated with the cluster.
      Security Group	You can select Create Basic Security Group, Create Advanced Security Group, or Select Existing Security Group. For more information, see Overview.
      Log Service	Specify whether to enable Log Service. You can select an existing Log Service project or create a new Log Service project. If you select Enable Log Service, the Log Service plug-in is automatically installed in the cluster. You can use Log Service with simple configurations when you create an application. For more information, see Use Log Service to collect container logs.
      Deletion Protection	Specify whether to enable deletion protection. If you select this check box, the cluster cannot be deleted in the console or by calling an API operation. This avoids cluster deletion due to user errors.
      Labels	Add labels to nodes. Enter a key and a value, and then click Add. Note Key is required. Value is optional. Keys are not case-sensitive. A key must be 1 to 64 characters in length, and cannot start with aliyun, acs:, http://, or https://. Values are not case-sensitive. A value must be 1 to 128 characters in length, and cannot start with aliyun, acs:, http://, or https://. The Value parameter can be left empty. The keys of labels that are added to the same resource must be unique. If you add a label with a used key, the label overwrites the label that uses the same key. You can add up to 20 labels to a resource. If you add more than 20 labels to a resource, all labels become invalid. You must remove excess labels for the remaining labels to take effect.
      Terms of Service	Read and select Terms of Service and Disclaimer.

   5. On the right side of the page, click Create Cluster.
      You can find the newly created cluster on the Clusters page.
2. Register an on-premises cluster.
   1. On the Clusters page, select the newly created cluster and click Details in the Actions column. In this example, select cluster test-external-cluster1.
   2. On the details page of the cluster, click the Connection Information tab.
   3. In the Agent for Connecting to the Cluster section, click the Public Network or Internal Network tab based on your business requirements and then click Copy on the right side. Create a YAML file and paste the copied code to the file. Then, use kubectl to execute the file and register the external cluster.
      For example, you can create an agent.yaml file and paste the copied code to the agent.yaml file. Then, run the kubectl apply -f agent.yaml command in the on-premises cluster to register the cluster.
   4. Run the following command in the on-premises cluster to query the state of the agent:

      kubectl -n kube-system get pod |grep ack-cluster-agent

      The following output is returned:

      ack-cluster-agent-5f7d568f6-6fc4k              1/1     Running   0          9s
      ack-cluster-agent-5f7d568f6-tf6fp              1/1     Running   0          9s

      After the cluster is registered, verify that the cluster is in the Running state on the Clusters page.