Cluster Autoscaler - It is a component that automatically adjusts the size of a Kubernetes Cluster so that all pods have a place to run and there are no unneeded nodes. It can be created by using the YAML file, Helm Chart, or Terraform. The following example creates the Cloud Autoscalar deployment using Terraform dynamic Modules.
Corresponding to https://github.com/kubernetes/autoscaler/blob/master/cluster-autoscaler/cloudprovider/aws/examples/cluster-autoscaler-autodiscover.yamlResource kubernetes_deployment:-
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cluster-autoscaler.tf:-
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resource "kubernetes_deployment" "cluster-autoscaler" {
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metadata {
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name = var.cluster-autoscaler-data["cluster-autoscaler-name"]
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namespace = var.cluster-autoscaler-data["namespace"]
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labels = {
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"app" = var.cluster-autoscaler-data["cluster-autoscaler-label"]
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}
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}
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spec {
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replicas = 1
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selector {
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match_labels = {
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"app" = var.cluster-autoscaler-data["cluster-autoscaler-label"]
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}
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}
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template {
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metadata {
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labels = {
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"app" = var.cluster-autoscaler-data["cluster-autoscaler-label"]
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}
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annotations = {
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"prometheus.io/port" = "8085"
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"prometheus.io/scrape" = "true"
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}
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}
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spec {
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automount_service_account_token = true
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termination_grace_period_seconds = 300
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service_account_name = var.service-account-name
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container {
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image = var.cluster-autoscaler-data["image_name"]
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name = "cluster-autoscaler"
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command = ["./cluster-autoscaler",
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"--v=4",
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" --stderrthreshold=info",
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"--cloud-provider=aws",
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"--skip-nodes-with-local-storage=false",
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"--expander=least-waste",
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"--node-group-auto-discovery=asg:tag=k8s.io/cluster-autoscaler/enabled,k8s.io/cluster-autoscaler/${var.eks_cluster_name}"
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]
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resources {
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limits {
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cpu = "100m"
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memory = "300Mi"
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}
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requests {
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cpu = "100m"
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memory = "300Mi"
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}
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}
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volume_mount {
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name = "ssl-certs"
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mount_path = "/etc/ssl/certs/ca-certificates.crt"
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read_only = "true"
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}
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}
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volume {
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name = "ssl-certs"
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host_path {
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path = "/etc/ssl/certs/ca-bundle.crt"
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}
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}
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}
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}
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}
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}
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variable.tf :-
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variable "cluster-autoscaler-data" {}
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variable "service-account-name" {}
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variable "eks_cluster_name" {}
Service Account Module:-