How can I establish the connection for the EKS cluster by using the command line interface?

215    Asked by Aalapprabhakaran in AWS , Asked on May 15, 2024

I have just set up an Amazon EKS cluster and now I need to connect it from my local machine to deploy and manage applications. How can I go about establishing the connection for the EKS cluster by using the command line interface?

Answered by Aashna Saito

 In the context of AWS, you can connect to an Amazon EKS cluster from the command line interface by using the following steps:-

Install and configure AWS

Try to ensure that you have the AWS command line interface installed and also Configured with the required Credentials.

Install and configure kubectl

You can install the “kubectl” command line tool which is used for interactions with the Kubernetes cluster. You can install it by using a package manager or by downloading it directly from the Kubernetes GitHub repository.

Retrieve cluster Configuration

You can use the AWS CLI for retrieving the cluster Configuration for your EKS cluster. This includes the endpoint URL, certificate authority data, and cluster name.

Configuration of kubectl

You can set up ‘kubectl’ for using the retrieved cluster Configuration. This includes running a command like “aws eks—region update- kubeconfig—name

Verify connection

Finally, you can verify whether you can connect to the eks cluster or not by running the “kubectl1 get nodes” or any other Kubernetes command.

Here is an example of how you can accomplish this in a shell script:-

#!/bin/bash
# Step 1: Install and configure AWS CLI
# Skip if already installed and configured
# Step 2: Install and configure kubectl
# Skip if already installed
# Replace with the desired version of kubectl
Curl -LO https://storage.googleapis.com/kubernetes-release/release/$(curl -s https://storage.googleapis.com/kubernetes-release/release/stable.txt)/bin/linux/amd64/kubectl
Chmod +x ./kubectl
Mv ./kubectl /usr/local/bin/kubectl
# Step 3: Retrieve cluster Configuration
# Replace and with your cluster’s actual name and region
Aws eks –region update-kubeconfig –name
# Step 4: Verify connection
Kubectl get nodes
Here is the example code given in java programming language:-
Import io.kubernetes.client.ApiClient;
Import io.kubernetes.client.Configuration;
Import io.kubernetes.client.Exec;
Import io.kubernetes.client.openapi.ApiClientBuilder;
Import io.kubernetes.client.util.ClientBuilder;
Import io.kubernetes.client.util.KubeConfig;
Import software.amazon.awssdk.auth.credentials.AwsCredentials;
Import software.amazon.awssdk.auth.credentials.DefaultCredentialsProvider;
Import software.amazon.awssdk.regions.Region;
Import software.amazon.awssdk.services.eks.EksClient;
Public class EksClusterConnector {
    Public static void main(String[] args) throws Exception {
        // Set AWS credentials provider
        AwsCredentials credentials = DefaultCredentialsProvider.create().resolveCredentials();
        String region = “us-west-2”; // Replace with your desired region
        // Set AWS EKS client
        EksClient eksClient = EksClient.builder()
                .region(Region.of(region))
                .credentialsProvider(() -> credentials)
                .build();
        // Get EKS cluster endpoint and certificate
        String clusterName = “your-cluster-name”;
        String endpoint = eksClient.describeCluster(r -> r.name(clusterName)).cluster().endpoint();
        String certificateAuthorityData = eksClient.describeCluster(r -> r.name(clusterName)).cluster().certificateAuthority().data();
        // Set Kubernetes API client
        ApiClient client = ClientBuilder.kubeconfig(KubeConfig.loadKubeConfig())
                .setBasePath(endpoint)
                .setVerifyingSsl(true)
                .setCertificateAuthority(certificateAuthorityData)
                .build();
        // Set the default API client for Kubernetes client library
        Configuration.setDefaultApiClient(client);
        // Verify connection by listing nodes
        Exec exec = new Exec();
        Exec.apiClient(client);
        // Replace with your desired namespace or remove if not needed
        Exec.exec(“kubectl”, “get”, “nodes”, “—namespace”, “”);
    }
}

Here Is the example code given in HTML:-

EKS Cluster Connector



EKS Cluster Connector


[removed]

Async function connectToCluster() {
  Try {
    Const response = await fetch(‘/connect-cluster’, {
      Method: ‘POST’,
      Headers: {
        ‘Content-Type’: ‘application/json’
      },
      Body: JSON.stringify({
        clusterName: ‘your-cluster-name’,
        region: ‘us-west-2’ // Replace with your desired region
      })
    });
    Const result = await response.json();
    If (response.ok) {
      Console.log(‘Connected to cluster:’, result);
      // Perform further actions or display success message
    } else {
      Console.error(‘Error connecting to cluster:’, result.error);
      // Display error message to the user
    }
  } catch (error) {
    Console.error(‘Error connecting to cluster:’, error);
    // Handle network errors or other exceptions
  }
}

[removed]





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