Custom launch template is not used when creating a new Managed Node Group

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Issue details

When creating a new Managed Node Group, I specified a custom (ec2) launch template via launchTemplate.

Though, newly launched EC2 instances do not appear to be using this launch template since the EC2 instance tag name aws:ec2launchtemplate:id refers to the one created by this provider instead.

Steps to reproduce

1. Use https://github.com/pulumi/pulumi-eks/tree/master/examples/managed-nodegroups as a starting point
2. Create a new launch template as part of your code

const launchTemplate = new aws.ec2.LaunchTemplate("my-launch-template", {
    tags: {testTag: "tag value"},
});

1. Set the launch template for the managed node group like this

	...
	launchTemplate: {
		id: launchTemplate.id,
		version: '$Latest'
	}

1. Deploy your changes

Expected: The custom launch template is used to launch new EC2 instances. Actual: The default launch template created by this provider is used.

[nimbinatus]

Reopening this with a question from the community Slack:

Attaching a custom LaunchTemplate to an EKS ManagedNodeGroup doesn’t seem to work? For example, following this: https://github.com/pulumi/pulumi-eks/tree/master/examples/managed-nodegroups. I create a new LaunchTemplate with some metadata options and a key pair, refer to it in the eks.createManagedNodeGroup() args:

launchTemplate: {
 id: pulumi.interpolate`${myLaunchTemplate.id}`,
 version: "1",
},

When the node group comes up, it says on the EKS page that it’s using mine, but on the instances themselves in the ASG, it’s using an auto-created one. Is this a bug? Or am I missing something fundamental?

[con5cience]

id is an Output, so you need to interpolate it:

id: pulumi.interpolate`${launchTemplate.id}`

More context:

https://www.pulumi.com/registry/packages/aws/api-docs/ec2/launchtemplate/#outputs https://www.pulumi.com/docs/intro/concepts/inputs-outputs/#outputs-and-strings

It is not recommended to use ‘$Latest’ for the launch template version because the AWS API will this as 1 and parse it as drift every time, causing Pulumi to delete-replace it.