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Import an AWS EKS Cluster

This tutorial demonstrates how to import an AWS EKS cluster through the direct connection method. If you want to use the agent connection method, refer to Agent Connection.

Prerequisites

You have a Kubernetes cluster with KubeSphere installed, and prepared this cluster as the Host Cluster. For more information about how to prepare a Host Cluster, refer to Prepare a Host Cluster.
You have an EKS cluster to be used as the Member Cluster.

Import an EKS Cluster

Step 1: Deploy KubeSphere on your EKS Cluster

You need to deploy KubeSphere on your EKS cluster first. For more information about how to deploy KubeSphere on EKS, refer to Deploy KubeSphere on AWS EKS.

Step 2: Prepare the EKS Member Cluster

In order to manage the Member Cluster from the Host Cluster, you need to make jwtSecret the same between them. Therefore, get it first by executing the following command on your Host Cluster.
```
kubectl -n kubesphere-system get cm kubesphere-config -o yaml | grep -v "apiVersion" | grep jwtSecret
```
The output is similar to the following:
```
jwtSecret: "QVguGh7qnURywHn2od9IiOX6X8f8wK8g"
```
Log in to the KubeSphere console of the EKS cluster as admin. Click Platform in the upper-left corner and then select Cluster Management.
Go to CRDs, enter ClusterConfiguration in the search bar, and then press Enter on your keyboard. Click ClusterConfiguration to go to its detail page.
Click on the right and then select Edit YAML to edit ks-installer.
In the YAML file of ks-installer, change the value of jwtSecret to the corresponding value shown above and set the value of clusterRole to member. Click Update to save your changes.
```
authentication:
  jwtSecret: QVguGh7qnURywHn2od9IiOX6X8f8wK8g
```
```
multicluster:
  clusterRole: member
```
Note

Make sure you use the value of your own jwtSecret. You need to wait for a while so that the changes can take effect.

Step 3: Create a new kubeconfig file

Amazon EKS doesn’t provide a built-in kubeconfig file as a standard kubeadm cluster does. Nevertheless, you can create a kubeconfig file by referring to this document. The generated kubeconfig file will be like the following:

apiVersion: v1
clusters:
- cluster:
    server: <endpoint-url>
    certificate-authority-data: <base64-encoded-ca-cert>
  name: kubernetes
contexts:
- context:
    cluster: kubernetes
    user: aws
  name: aws
current-context: aws
kind: Config
preferences: {}
users:
- name: aws
  user:
    exec:
      apiVersion: client.authentication.k8s.io/v1alpha1
      command: aws
      args:
        - "eks"
        - "get-token"
        - "--cluster-name"
        - "<cluster-name>"
        # - "--role"
        # - "<role-arn>"
      # env:
        # - name: AWS_PROFILE
        #   value: "<aws-profile>"

However, this automatically generated kubeconfig file requires the command aws (aws CLI tools) to be installed on every computer that wants to use this kubeconfig.

Run the following commands on your local computer to get the token of the ServiceAccount kubesphere created by KubeSphere. It has the cluster admin access to the cluster and will be used as the new kubeconfig token.

TOKEN=$(kubectl -n kubesphere-system get secret $(kubectl -n kubesphere-system get sa kubesphere -o jsonpath='{.secrets[0].name}') -o jsonpath='{.data.token}' | base64 -d)
kubectl config set-credentials kubesphere --token=${TOKEN}
kubectl config set-context --current --user=kubesphere

Retrieve the new kubeconfig file by running the following command:

cat ~/.kube/config

The output is similar to the following and you can see that a new user kubesphere is inserted and set as the current-context user:

apiVersion: v1
clusters:
- cluster:
    certificate-authority-data: LS0tLS1CRUdJTiBDRVJUSUZ...S0tLQo=
    server: https://*.sk1.cn-north-1.eks.amazonaws.com.cn
  name: arn:aws-cn:eks:cn-north-1:660450875567:cluster/EKS-LUSLVMT6
contexts:
- context:
    cluster: arn:aws-cn:eks:cn-north-1:660450875567:cluster/EKS-LUSLVMT6
    user: kubesphere
  name: arn:aws-cn:eks:cn-north-1:660450875567:cluster/EKS-LUSLVMT6
current-context: arn:aws-cn:eks:cn-north-1:660450875567:cluster/EKS-LUSLVMT6
kind: Config
preferences: {}
users:
- name: arn:aws-cn:eks:cn-north-1:660450875567:cluster/EKS-LUSLVMT6
  user:
    exec:
      apiVersion: client.authentication.k8s.io/v1alpha1
      args:
      - --region
      - cn-north-1
      - eks
      - get-token
      - --cluster-name
      - EKS-LUSLVMT6
      command: aws
      env: null
- name: kubesphere
  user:
    token: eyJhbGciOiJSUzI1NiIsImtpZCI6ImlCRHF4SlE5a0JFNDlSM2xKWnY1Vkt5NTJrcDNqRS1Ta25IYkg1akhNRmsifQ.eyJpc3M................9KQtFULW544G-FBwURd6ArjgQ3Ay6NHYWZe3gWCHLmag9gF-hnzxequ7oN0LiJrA-al1qGeQv-8eiOFqX3RPCQgbybmix8qw5U6f-Rwvb47-xA

You can run the following command to check that the new kubeconfig does have access to the EKS cluster.

kubectl get nodes

The output is simialr to this:

NAME                                        STATUS   ROLES    AGE   VERSION
ip-10-0-47-38.cn-north-1.compute.internal   Ready    <none>   11h   v1.18.8-eks-7c9bda
ip-10-0-8-148.cn-north-1.compute.internal   Ready    <none>   78m   v1.18.8-eks-7c9bda

Step 4: Import the EKS Member Cluster

Log in to the KubeSphere console on your Host Cluster as admin. Click Platform in the upper-left corner and then select Cluster Management. On the Cluster Management page, click Add Cluster.
Enter the basic information based on your needs and click Next.
In Connection Method, select Direct Connection. Fill in the new kubeconfig file of the EKS Member Cluster and then click Create.
Wait for cluster initialization to finish.

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