This Terraform Module installs a Cluster Autoscaler
to automatically scale up and down the nodes in a cluster in response to resource utilization.
This module is responsible for manipulating each Auto Scaling Group (ASG) that was created by the EKS cluster
workers module. By default, the ASG is configured to allow zero-downtime
deployments but is not configured to scale automatically. You must launch an EKS control
plane with worker nodes for this module to function.
How do you use this module?
See the root README for instructions on using Terraform modules.
See variables.tf for all the variables you can set on this module.
Important Considerations
The autoscaler doesn't account for CPU or Memory usage in deciding to scale up, it scales up when Pods fail to
schedule due to insufficient resources. This means it's important to carefully the manage the compute resources you
assign to your deployments. See the Kubernetes
documentation on compute
resources for more information.
Scaling down happens when utilization dips below a specified threshold and there are pods that are able to be moved
to another node. There are a variety of conditions
to be aware of that can prevent pods from being automatically removable which can result in wasted capacity.
How do I deploy the Pods to Fargate?
To deploy the Pods to Fargate, you can use the create_fargate_profile variable to true and specify the subnet IDs
for Fargate using vpc_worker_subnet_ids. Note that if you are using Fargate, you must rely on the IAM Roles for
Service Accounts (IRSA) feature to grant the necessary AWS IAM permissions to the Pod. This is configured using the
use_iam_role_for_service_accounts, eks_openid_connect_provider_arn, and eks_openid_connect_provider_url input
variables.
Questions? Ask away.
We're here to talk about our services, answer any questions, give advice, or just to chat.
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class=\"preview__body--title\" id=\"k-8-s-cluster-autoscaler-module\">K8S Cluster Autoscaler Module</h1><div class=\"preview__body--border\"></div><p>This Terraform Module installs a <a href=\"https://github.com/kubernetes/autoscaler/tree/master/cluster-autoscaler\" class=\"preview__body--description--blue\" target=\"_blank\">Cluster Autoscaler</a>\nto automatically scale up and down the nodes in a cluster in response to resource utilization.</p>\n<p>This module is responsible for manipulating each Auto Scaling Group (ASG) that was created by the <a href=\"/repos/v0.44.3/terraform-aws-eks/modules/eks-cluster-workers\" class=\"preview__body--description--blue\">EKS cluster\nworkers</a> module. By default, the ASG is configured to allow zero-downtime\ndeployments but is not configured to scale automatically. You must launch an <a href=\"/repos/v0.44.3/terraform-aws-eks/modules/eks-cluster-control-plane\" class=\"preview__body--description--blue\">EKS control\nplane</a> with worker nodes for this module to function.</p>\n<h2 class=\"preview__body--subtitle\" id=\"how-do-you-use-this-module\">How do you use this module?</h2>\n<ul>\n<li>See the <a href=\"/repos/v0.44.3/terraform-aws-eks/README.adoc\" class=\"preview__body--description--blue\">root README</a> for instructions on using Terraform modules.</li>\n<li>See <a href=\"/repos/v0.44.3/terraform-aws-eks/modules/eks-k8s-cluster-autoscaler/variables.tf\" class=\"preview__body--description--blue\">variables.tf</a> for all the variables you can set on this module.</li>\n</ul>\n<h2 class=\"preview__body--subtitle\" id=\"important-considerations\">Important Considerations</h2>\n<ul>\n<li>The autoscaler doesn't account for CPU or Memory usage in deciding to scale up, it scales up when Pods fail to\nschedule due to insufficient resources. This means it's important to carefully the manage the compute resources you\nassign to your deployments. See <a href=\"https://kubernetes.io/docs/concepts/configuration/manage-compute-resources-container\" class=\"preview__body--description--blue\" target=\"_blank\">the Kubernetes\ndocumentation</a> on compute\nresources for more information.</li>\n<li>Scaling down happens when utilization dips below a specified threshold and there are pods that are able to be moved\nto another node. There are <a href=\"https://github.com/kubernetes/autoscaler/blob/master/cluster-autoscaler/FAQ.md#what-types-of-pods-can-prevent-ca-from-removing-a-node\" class=\"preview__body--description--blue\" target=\"_blank\">a variety of conditions</a>\nto be aware of that can prevent pods from being automatically removable which can result in wasted capacity.</li>\n</ul>\n<h2 class=\"preview__body--subtitle\" id=\"how-do-i-deploy-the-pods-to-fargate\">How do I deploy the Pods to Fargate?</h2>\n<p>To deploy the Pods to Fargate, you can use the <code>create_fargate_profile</code> variable to <code>true</code> and specify the subnet IDs\nfor Fargate using <code>vpc_worker_subnet_ids</code>. Note that if you are using Fargate, you must rely on the IAM Roles for\nService Accounts (IRSA) feature to grant the necessary AWS IAM permissions to the Pod. This is configured using the\n<code>use_iam_role_for_service_accounts</code>, <code>eks_openid_connect_provider_arn</code>, and <code>eks_openid_connect_provider_url</code> input\nvariables.</p>\n","repoName":"terraform-aws-eks","repoRef":"v0.22.0","serviceDescriptor":{"serviceName":"EC2 Kubernetes Service (EKS) Cluster","serviceRepoName":"terraform-aws-eks","serviceRepoOrg":"gruntwork-io","cloudProviders":["aws"],"description":"Deploy a Kubernetes cluster on top of Amazon EC2 Kubernetes Service (EKS).","imageUrl":"eks.png","licenseType":"subscriber","technologies":["Terraform","Python","Bash"],"compliance":[],"tags":[""]},"serviceCategoryName":"Docker orchestration","fileName":"README.md","filePath":"/modules/eks-k8s-cluster-autoscaler","title":"Repo Browser: EC2 Kubernetes Service (EKS) Cluster","description":"Browse the repos in the Gruntwork Infrastructure as Code Library."}
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main.tf
