參考官方文件：https://eksctl.io/usage/managing-nodegroups/

建立nodegroup命令

eksctl create nodegroup --cluster=<clusterName> [--name=<nodegroupName>]

例如
eksctl create nodegroup --cluster=faberbeta --name=high-memory-group

看樣子這個方式不是很好，因為不能詳細配置nodegroup伺服器的配置

推薦使用--config-file指定配置檔案來建立nodegroup

命令:
eksctl create nodegroup --config-file=high-memory-cluster.yaml

high-memory-cluster.yaml的配置檔案

apiVersion: eksctl.io/v1alpha5
kind: ClusterConfig

metadata:
  name: faberbeta
  region: ap-east-1

managedNodeGroups:
  - name: high-mem-nodegroup
    instanceType: r5.large
    minSize: 3
    maxSize: 6
    desiredCapacity: 3
    volumeSize: 30
    ssh:
      allow: true
      publicKeyPath: /root/.ssh/id_rsa.pub
    labels: {role: worker}
    tags:
      nodegroup-role: worker
    iam:
      withAddonPolicies:
        imageBuilder: true
        autoScaler: true
        externalDNS: true
        certManager: true
        appMesh: true
        appMeshPreview: true
        ebs: true
        fsx: true
        efs: true
        albIngress: true
        xRay: true
        cloudWatch: true