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Here’s a lovely GitHub issue with more details: https://github.com/terraform-aws-modules/terraform-aws-eks/issues/1539
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SaaSHub
SaaSHub - Software Alternatives and Reviews. SaaSHub helps you find the best software and product alternatives
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karpenter-provider-aws
Karpenter is a Kubernetes Node Autoscaler built for flexibility, performance, and simplicity.
A point worth noting is that using the AWS Load Balancer Controller decouples your node management with your cluster management. Let’s say we wanted to use Karpenter for autoscaling instead of the defacto cluster-autoscaler. Karpenter will not use AWS AutoScalingGroups but will instead create standalone EC2 instances based on the Provisioners you define. This means our previous approach of attaching AutoScalingGroups with TargetGroups will not work as the EC2 instances Karpenter manages will not belong to the AutoScalingGroup and therefore not be automatically attached to the TargetGroup. The AWS Load Balancer Controller doesn’t care how the nodes are created; only that they belong to the cluster and match the label selectors defined. Probably we will look into Karpenter again in the near future for our project now that it supports pod anti-affinity, as this was previously a blocker for us.
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Looking back at our use case, we want to use an existing Application Load Balancer that is managed by Terraform. If you search for this online, you will most certainly find another lovely GitHub issue: https://github.com/kubernetes-sigs/aws-load-balancer-controller/issues/228
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It’s not an ideal situation to use Helm charts for this purpose, but the inspiration came from the ArgoCD app of apps example repository. Anyway, I am fairly happy with this implementation and it works dynamically for any new clusters that we add to ArgoCD.
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karpenter
Discontinued Karpenter is a Kubernetes Node Autoscaler built for flexibility, performance, and simplicity. [Moved to: https://github.com/aws/karpenter-provider-aws]
A point worth noting is that using the AWS Load Balancer Controller decouples your node management with your cluster management. Let’s say we wanted to use Karpenter for autoscaling instead of the defacto cluster-autoscaler. Karpenter will not use AWS AutoScalingGroups but will instead create standalone EC2 instances based on the Provisioners you define. This means our previous approach of attaching AutoScalingGroups with TargetGroups will not work as the EC2 instances Karpenter manages will not belong to the AutoScalingGroup and therefore not be automatically attached to the TargetGroup. The AWS Load Balancer Controller doesn’t care how the nodes are created; only that they belong to the cluster and match the label selectors defined. Probably we will look into Karpenter again in the near future for our project now that it supports pod anti-affinity, as this was previously a blocker for us.
