ec2: cfn-init support in ASGs

I want to use the logical ID of the resource created in the construct library. For example, cfn-signal require AutoScalingGroup’s logical id.

I wrote this code.

    const asg = cluster.addDefaultAutoScalingGroupCapacity({
      instanceType: new ec2.InstanceType("t2.xlarge"),
      instanceCount: 1,
    });

    const appLaunchTemplate = new ec2.cloudformation.LaunchTemplateResource(this, 'AppLaunchTemplate', {
      launchTemplateName: "launchtemplatetest",
      launchTemplateData: {
        userData: new cdk.FnBase64([
            `#!/bin/sh`,
            `set -e`,
            `echo ECS_CLUSTER=${cluster.clusterName} >> /etc/ecs/ecs.config`,
            `/opt/aws/bin/cfn-signal -e $? --stack ${new cdk.AwsStackName()} --resource ${asg.autoScalingGroupName} --region ${new cdk.AwsRegion}`,
          ].join('\n')
        ),
      }
    })
    appLaunchTemplate.addDependency(instanceProfile)

    const asgResource = asg.findChild('ASG') as autoscaling.cloudformation.AutoScalingGroupResource

    asgResource.addPropertyDeletionOverride('LaunchConfigurationName')
    asgResource.addPropertyOverride('LaunchTemplate', {
      LaunchTemplateId: appLaunchTemplate.ref,
      Version: '1'
    })

However Circular dependency caused.

    SampleStack failed: ValidationError: Circular dependency between resources: [AppLaunchTemplate, ClusterDefaultAutoScalingGroupLifecycleHookDrainHook4A9A4325, ClusterDefaultAutoScalingGroupASG0F98E147]
Circular dependency between resources: [AppLaunchTemplate, ClusterDefaultAutoScalingGroupLifecycleHookDrainHook4A9A4325, ClusterDefaultAutoScalingGroupASG0F98E147]

This will be solved by specifying a name or not have a hash in construct library.

[SanderKnape]

For future reference, this is how you can get the logical ID for the autoscaling group:

const autoScalingGroupCfn = <CfnAutoScalingGroup> autoscalingGroup.node.tryFindChild('ASG');
console.log(autoScalingGroupCfn.logicalId);

[github-actions[bot]]

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