I am using eksctl to create our EKS cluster.

For the first run, it works out good, but if I want to upgrade the cluster-config later in the future, it's not working.

I have a cluster-config file with me, but any changes made to it are not reflect with update/upgrade command.

What am I missing?

Cluster.yaml :

apiVersion: eksctl.io/v1alpha5
kind: ClusterConfig

metadata: 
  name: supplier-service
  region: eu-central-1

vpc:
  subnets:
    public: 
      eu-central-1a: {id: subnet-1}
      eu-central-1b: {id: subnet-2}
      eu-central-1c: {id: subnet-2}

nodeGroups:
  - name: ng-1
    instanceType: t2.medium
    desiredCapacity: 3
    ssh: 
      allow: true
    securityGroups:
      withShared: true
      withLocal: true
      attachIDs: ['sg-1', 'sg-2']
    iam:
      withAddonPolicies:
        autoScaler: true

Now, if in the future, I would like to make change to instance.type or replicas, I have to destroy entire cluster and recreate...which becomes quite cumbersome.

How can I do in-place upgrades with clusters created by EksCtl? Thank you.