Container Service for Kubernetes：how to create a registered cluster

Create a registered cluster.

1. Log on to the ACK console. In the left-side navigation pane, click Clusters.

2. On the Clusters page, click Create Kubernetes Cluster.

3. On the Register Cluster tab, set the parameters.

   Parameter	Description
   Cluster Name	The name of the cluster. The name must be 1 to 63 characters in length, and can contain digits, letters, hyphens (-), and underscores (_). The name must start with a letter or digit.
   Resource Group	Move the pointer over All Resources at the top of the page and select the resource group that you want to use. After you select a resource group, virtual private clouds (VPCs) and vSwitches that belong to the resource group are displayed. When you create a cluster, only VPCs and vSwitches that belong to the specified resource group are displayed.
   Region	The region of the cluster.
   VPC	Select a VPC from the drop-down list.
   vSwitch	Select node vSwitches that belong to the specified VPC.
   Access to API Server	By default, ACK automatically creates an internal-facing SLB instance that uses the pay-as-you-go billing method for the API server. Important If you delete the default SLB instance, you cannot access the Kubernetes API server of the cluster. You can manually change the billing method. For more information, see Pay-as-you-go.
   Associate 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. Note If the cluster is connected to Alibaba Cloud over the Internet, you must select this option. You do not need to select this option if the cluster is connected to Alibaba Cloud over an Express Connect circuit.
   Security Group	You can select Create Basic Security Group, Create Advanced Security Group, or Select Existing Security Group. For more information about security groups, see Overview. Note Only users in the whitelist can select the Select Existing Security Group option. To apply to be added to the whitelist, log on to the Quota Center console and submit an application. If you select an existing security group, the system does not automatically configure security group rules. This may cause errors when you access the nodes in the cluster. You must manually configure security group rules. For more information about how to manage security group rules, see Configure security group rules to enforce access control on ACK clusters. By default, the security group used by ACK permits all outbound traffic. When you modify the security group due to business purposes, make sure that traffic destined for 100.64.0.0/10 is permitted. This CIDR block is used to pull images and query basic ECS information.
   Deletion Protection	Specify whether to enable deletion protection for the cluster. Deletion protection prevents the cluster from being deleted in the console or by calling the API. This prevents user errors.
   Labels	Add labels to the cluster. 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. 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.

4. On the right of the page, click Create Cluster.

   You can find the newly created cluster on the Clusters page.

Register a cluster.

1. On the Clusters page, select the newly created cluster and click Details in the Actions column. In this example, select the cluster named 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 a file named agent.yaml and paste the copied code to the agent.yaml file. Then, run the kubectl apply -f agent.yaml command in the cluster to register the cluster.

   Important

   If the cluster is connected to Alibaba Cloud over the Internet, select Public Network. If the cluster is connected to Alibaba Cloud over an internal network, select Internal Network.

   

4. Run the following command in the cluster to query the status of the agent:

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

   Expected output:

   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.