Taking ASG name from the EKS nodegroup

[dzirg44]

I want to attach ASG that was created via Nodegroup to my ALB, I understand that constructions like

    const ServiceAsg =
      this.K8sAwsManagedNodeGroup.nodegroup.node.tryFindChild(
        'ASG'
      ) as CfnAutoScalingGroup;

will not work, because we don't have nested children with ASG, but maybe it is possible to take it from the custom resources, etc.?

[dzirg44]

    const nodegroupNameStrings = Fn.split(
      '/',
      this.K8sAwsManagedNodeGroupIngress.nodegroup.nodegroupName
    );
    const ngName = Fn.select(1, nodegroupNameStrings);

    const nodeGroupASG = new AwsCustomResource(this, 'nodeGroupASG', {
      policy: AwsCustomResourcePolicy.fromSdkCalls({
        resources: AwsCustomResourcePolicy.ANY_RESOURCE
      }),
      onUpdate: {
        action: 'describeNodegroup',
        service: 'EKS',
        physicalResourceId: PhysicalResourceId.of(
          'EKS.DescribeNodegroup.nodegroup.resources.autoScalingGroups'
        ),
        outputPaths: ['nodegroup.resources.autoScalingGroups'],
        parameters: {
          clusterName: this.k8sCluster.k8sCluster.clusterName,
          nodegroupName: ngName
        }
      },
      onCreate: {
        action: 'describeNodegroup',
        service: 'EKS',
        physicalResourceId: PhysicalResourceId.of(
          'EKS.DescribeNodegroup.nodegroup.resources.autoScalingGroups'
        ),

        outputPaths: ['nodegroup.resources.autoScalingGroups'],
        parameters: {
          clusterName: this.k8sCluster.k8sCluster.clusterName,
          nodegroupName: ngName
        }
      }
    });
    const asgName = nodeGroupASG.getResponseField(
      'nodegroup.resources.autoScalingGroups.0.name'
    );
    const asgFromNodegroup = AutoScalingGroup.fromAutoScalingGroupName(
      this,
      'AsgName',
      asgName
    );

Hi everyone it is a simple workaround that helps to take the ASG from the Nodegroup
Unfortunately there is no way to attach it to the Target Group because IAutoScalingGroup interface doesn't have all required methods that has original ASG resource. If you somehow overcame it, let me know in the comments .

[github-actions[bot]]

Hello! Reopening this discussion to make it searchable.