eks-nodegroup.yml

AWSTemplateFormatVersion: 2010-09-09
Description:
  EKS managed node group

Parameters:
  EnvironmentName:
    Type: String 
  
  NodeMin:
    Type: String 
  
  NodeMax:
    Type: String 
  
  NodeDesired:
    Type: String 
  
  NodeInstanceType:
    Type: String
  
  Label:
    Type: String

  KeyName:
    Type: "AWS::EC2::KeyPair::KeyName"
    Description: The EC2 Key Pair to allow SSH access to the instances

Resources:
#-----     EKS Node group    -----#    
  EKSNodegroup:
    Type: 'AWS::EKS::Nodegroup'
    Properties:
      ClusterName:
        !ImportValue 
        'Fn::Sub': '${EnvironmentName}-eks-cluster'
      NodeRole:
        !ImportValue 
        'Fn::Sub': '${EnvironmentName}-eks-node-role'
      NodegroupName: !Sub ${EnvironmentName}-eks-${Label}-node-group
      ScalingConfig:
        MinSize: !Ref NodeMin
        DesiredSize: !Ref NodeDesired
        MaxSize: !Ref NodeMax
      Labels:
        Name: !Ref Label
      # Need to use DefaultVersionNumber instead of LatestVersion. Limitation in CF when using launch templates
      LaunchTemplate:
        Id: !Ref EKSLaunchTemplate
        Version: !GetAtt EKSLaunchTemplate.DefaultVersionNumber
      Subnets:
        - !ImportValue 
         'Fn::Sub': '${EnvironmentName}-eks-subnet1' 
        - !ImportValue 
         'Fn::Sub': '${EnvironmentName}-eks-subnet2'

  EKSLaunchTemplate:
    Type: 'AWS::EC2::LaunchTemplate'
    Properties:
        LaunchTemplateName: !Sub ${EnvironmentName}-eks-${Label}-launch-template
        LaunchTemplateData:
          BlockDeviceMappings:
            - DeviceName: "/dev/xvda"
              Ebs:
                DeleteOnTermination: true
                Encrypted: true
                VolumeType: "gp2"
                VolumeSize: 20
          InstanceType: !Ref NodeInstanceType
          KeyName: !Ref KeyName
          TagSpecifications: 
            - ResourceType: instance
              Tags:
                - Key: "Name"
                  Value: !Sub ${EnvironmentName}-eks-node
            - ResourceType: volume
              Tags:
                - Key: "Name"
                  Value: !Sub ${EnvironmentName}-eks-node