Allow empty AMI ID, Instance type in launch template of AWSManagedMachinePool

[Julian-Chu]

/kind feature

We try to adopt CAPI+CAPA for our cluster to have same configuration, but find something not supported in the launch template.

Describe the solution you'd like

In the AWSManagedMachinePool spec

• when AMI type is defined(except CUSTOM type), the controller should create launch template without ami id. This allows EKS to use managed AMI with launch template
• when Instance type(s) is defined, the controller should create launch template without instance type(s).

Customizing managed nodes with launch templates

this is a launch template in our running EKS node group, we use to customize the security group and storage

Anything else you would like to add:

• if fine, we're happy to submit PR for implementation.
• do we also have to review the proposal doc?

Environment:

• Cluster-api-provider-aws version:
• Kubernetes version: (use kubectl version):
• OS (e.g. from /etc/os-release):

[richardcase]

/triage accepted /priority important-soon

[richardcase]

/milestone v2.3.0

[AndiDog]

/milestone v2.4.0

to match the delayed PR https://github.com/kubernetes-sigs/cluster-api-provider-aws/pull/4388

[k8s-ci-robot]

@AndiDog: You must be a member of the kubernetes-sigs/cluster-api-provider-aws-maintainers GitHub team to set the milestone. If you believe you should be able to issue the /milestone command, please contact your Cluster API Provider AWS Maintainers and have them propose you as an additional delegate for this responsibility.

In response to [this](https://github.com/kubernetes-sigs/cluster-api-provider-aws/issues/4377#issuecomment-1814489599): >/milestone v2.4.0 > >to match the delayed PR https://github.com/kubernetes-sigs/cluster-api-provider-aws/pull/4388 Instructions for interacting with me using PR comments are available [here](https://git.k8s.io/community/contributors/guide/pull-requests.md). If you have questions or suggestions related to my behavior, please file an issue against the [kubernetes/test-infra](https://github.com/kubernetes/test-infra/issues/new?title=Prow%20issue:) repository.

[richardcase]

/milestone v2.4.0

[k8s-triage-robot]

This issue is labeled with priority/important-soon but has not been updated in over 90 days, and should be re-triaged. Important-soon issues must be staffed and worked on either currently, or very soon, ideally in time for the next release.

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/remove-triage accepted

[k8s-triage-robot]

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/lifecycle stale

[k8s-triage-robot]

The Kubernetes project currently lacks enough active contributors to adequately respond to all issues.

This bot triages un-triaged issues according to the following rules:

• After 90d of inactivity, lifecycle/stale is applied
• After 30d of inactivity since lifecycle/stale was applied, lifecycle/rotten is applied
• After 30d of inactivity since lifecycle/rotten was applied, the issue is closed

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• Mark this issue as fresh with /remove-lifecycle rotten
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Please send feedback to sig-contributor-experience at kubernetes/community.

/lifecycle rotten