Creating Amazon EKS cluster by eksctl

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What is Amazon EKS

Amazon EKS is a fully managed container orchestration service. EKS allows you to quickly deploy a production ready Kubernetes cluster in AWS, deploy and manage containerized applications more easily with a fully managed Kubernetes service.

EKS takes care of master node/control plane. We need to create worker nodes.

EKS cluster can be created in following ways:

1. AWS console
2. AWS CLI
3. eksctl command
4. using Terraform

We will create EKS cluster using eksctl command line tool.

Pre-requisites:

This Lab is using Jenkins EC2 instance. Jenkins EC2 instance needs to have following configured:

  • Install AWS CLI – Command line tools for working with AWS services, including Amazon EKS.

  • Install eksctl – A command line tool for working with EKS clusters that automates many individual tasks.

  • Install kubectl  – A command line tool for working with Kubernetes clusters. 

Create IAM Role with Administrator Access

You need to create an IAM role with AdministratorAccess policy.
Go to AWS console, IAM, click on Roles. create a role

 

Select AWS services, Click EC2, Click on Next permissions.
 
 Now search for AdministratorAccess policy and click


Skip on create tag.
Now give a role name and create it.

Assign the role to EC2 instance
Go to AWS console, click on EC2, select EC2 instance, Choose Security.
Click on Modify IAM Role



Choose the role you have created from the dropdown.
Select the role and click on Apply.

Switch to Jenkins user
sudo su - jenkins

Create EKS Cluster with two worker nodes using eksctl

eksctl create cluster --name demo-eks --region us-east-1 --nodegroup-name my-nodes --node-type t3.small --managed --nodes 2 

the above command should create a EKS cluster in AWS, it might take 15 to 20 mins. The eksctl tool uses CloudFormation under the hood, creating one stack for the EKS master control plane and another stack for the worker nodes. 

eksctl get cluster --name demo-eks --region us-east-1

This should confirm that EKS cluster is up and running.

Update Kube config by entering below command:

aws eks update-kubeconfig --name demo-eks --region us-east-1

kubeconfig file be updated under /var/lib/jenkins/.kube folder.

you can view the kubeconfig file by entering the below command:

cat  /var/lib/jenkins/.kube/config

Connect to EKS cluster using kubectl commands

To view the list of worker nodes as part of EKS cluster.

kubectl get nodes

kubectl get ns

Deploy Nginx on a Kubernetes Cluster
Let us run some apps to make sure they are deployed to Kubernetes cluster. The below command will create deployment:

kubectl create deployment nginx --image=nginx


View Deployments
kubectl get deployments

Delete EKS Cluster using eksctl

eksctl delete cluster --name demo-eks --region us-east-1

the above command should delete the EKS cluster in AWS, it might take a few mins to clean up the cluster.

Errors during Cluster creation
If you are having issues when creating a cluster, try to delete the cluster by executing the below command and re-create it.

eksctl delete cluster --name demo-eks --region us-east-1


or Login to AWS console --> AWS Cloud formation --> delete the stack manually.

you can also delete the cluster under AWS console --> Elastic Kubernetes Service --> Clusters
Click on Delete cluster

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