#install eksctl #macOS users can use Homebrew:

brew install weaveworks/tap/eksctl

#verify

eksctl version

#Create cluster

eksctl create cluster --nodes 1 --region us-west-2

--> helloworld.yaml

---
apiVersion: extensions/v1beta1
kind: Deployment
metadata:
  name: helloworld-deployment
  labels:
    app: helloworld
spec:
  replicas: 1
  template:
    metadata:
      labels:
        app: helloworld
    spec:
      containers:
      - name: helloworld
        image: dockercloud/hello-world
        ports:
        - containerPort: 80
---
apiVersion: v1
kind: Service
metadata:
  name: "service-helloworld"
spec:
  selector:
    app: helloworld
  type: LoadBalancer
  ports:
  - protocol: TCP
    port: 80
    targetPort: 80

#update kubeconfig if deleted

aws eks --region us-west-2 update-kubeconfig --name wonderful-mongoose-1566283660

#get nodegroup name

eksctl utils describe-stacks --region=us-west-2 --name=wonderful-mongoose-1566283660

#get details of nodegroup

eksctl get nodegroup --name=ng-6d3bf314 --region=us-west-2 --cluster=wonderful-mongoose-1566283660

#Change instance type(replace each of the nodegroups by creating a new one and deleting the old one) #add a new nodegroup --> nodegroup_update.yaml

apiVersion: eksctl.io/v1alpha5
kind: ClusterConfig

metadata:
  name: wonderful-mongoose-1566283660
  region: us-west-2

nodeGroups:
  - name: ng-mycluster
    instanceType: t2.medium
    desiredCapacity: 1

eksctl create nodegroup --config-file=nodegroup_update.yaml

#delete old nodegroup

eksctl delete nodegroup --name=ng-6d3bf314 --region=us-west-2 --cluster=wonderful-mongoose-1566283660