asg_node_group.yaml

---
AWSTemplateFormatVersion: '2010-09-09'
Description: 'Unmanaged EKS nodegroup using EC2 AutoScaling'
Parameters:
  ClusterName:
    Type: String
    Description: Name of EKS cluster.
  AutoScalingGroupName:
    Description: Name of ASG.
    Type: String
  VpcId:
    Type: AWS::EC2::VPC::Id
  SubnetIds:
    Type: List<AWS::EC2::Subnet::Id>
  SecurityGroup:
    Type: AWS::EC2::SecurityGroup::Id
  LaunchTemplateName:
    Type: String
    Description: Launch template name.
  LaunchTemplateVersion:
    Type: String
    Description: Launch template version. Default is 1, since our launch templates are generally ephemeral/single-use.
    Default: "1"
  NodeCount:
    Type: Number
Resources:
  AutoScalingGroup:
    Type: AWS::AutoScaling::AutoScalingGroup
    UpdatePolicy:
      AutoScalingRollingUpdate:
        WaitOnResourceSignals: true
        PauseTime: PT15M
    Properties:
      AutoScalingGroupName: !Ref AutoScalingGroupName
      DesiredCapacity: !Ref NodeCount
      MinSize: !Ref NodeCount
      MaxSize: !Ref NodeCount
      MixedInstancesPolicy:
        LaunchTemplate:
          LaunchTemplateSpecification:
            LaunchTemplateName: !Ref LaunchTemplateName
            Version: !Ref LaunchTemplateVersion
          # this will be replaced out-of-band, CFN really doesn't want you to pass in sub-structs as JSON
          Overrides: PLACEHOLDER_LAUNCH_TEMPLATE_OVERRIDES
      VPCZoneIdentifier:
        !Ref SubnetIds
      Tags:
        # necessary for kubelet's legacy, in-tree cloud provider
        - Key: !Sub kubernetes.io/cluster/${ClusterName}
          Value: owned
          PropagateAtLaunch: true