(aws-eks): Exposing the Auto Scaling Group from a Nodegroup

Description

The idea of this feature request is to add to EKS Construct Library the ability of exposing the resulting Auto Scaling Group created for a EKS Managed Node Group

Use Case

Enable Interacting with the resulting Auto Scaling Group created by addNodegroupCapacity method

Proposed Solution

N/A

Other information

No response

Acknowledge

• I may be able to implement this feature request
• This feature might incur a breaking change

[yws-ss]

@pahud Could you take a look and help reopen this ticket?

[yws-ss]

Hello team,

There have a scenario need this feature. Per Cluster Autoscaler document mentioned, if the node group want to scale up from 0, we need to add the resources tags on the auto scaling group to let Cluster Autoscaler discover them [1]. Such as:

Key: k8s.io/cluster-autoscaler/node-template/resources/$RESOURCE_NAME
Value: 5
Key: k8s.io/cluster-autoscaler/node-template/label/$LABEL_KEY
Value: $LABEL_VALUE
Key: k8s.io/cluster-autoscaler/node-template/taint/$TAINT_KEY
Value: NoSchedule

Base on current “NodeGroup” construct [2], we could not apply tags from it because managed node group tags currently cannot bring to auto scaling group. Also, “NodeGroup” construct would not return any auto scaling group information which could let us use other function such as “Tags” [3] to directly add tag to auto scaling group.

Currently, eksctl use AWS API at the backend to propagate the managed node group to auto scaling group [4]. I wonder to know could CDK implement the same thing at the backend?

[1] https://docs.aws.amazon.com/eks/latest/userguide/autoscaling.html [2] https://docs.aws.amazon.com/cdk/api/v1/docs/@aws-cdk_aws-eks.Nodegroup.html [3] https://docs.aws.amazon.com/cdk/v2/guide/tagging.html [4] https://github.com/weaveworks/eksctl/pull/5002