This Terraform Module defines an IAM
policy that
defines the minimal set of permissions necessary for the Kubernetes Cluster
Autoscaler. This policy can then be
attached to the EC2 instance profile of the worker nodes in a Kubernetes cluster which will allow the autoscaler to
manage scaling up and down EC2 instances in targeted Auto Scaling Groups in response to resource utilization.
See variables.tf for all the variables you can set on this module.
See outputs.tf for all the variables that are outputed by this module.
Attaching IAM policy to workers
To allow the Cluster Autoscaler to manage Auto Scaling Groups, it needs IAM permissions to monitor and adjust them.
Currently, the way to grant Pods IAM privileges is to use the worker IAM profiles provisioned by the
eks-cluster-workers module.
The Terraform templates in this module create an IAM policy that has the required permissions. You then need to use an
aws_iam_policy_attachment to attach that
policy to the IAM roles of your EC2 Instances.
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class=\"preview__body--title\" id=\"k-8-s-cluster-autoscaler-iam-policy-module\">K8S Cluster Autoscaler IAM Policy Module</h1><div class=\"preview__body--border\"></div><p>This Terraform Module defines an <a href=\"http://docs.aws.amazon.com/AmazonCloudWatch/latest/DeveloperGuide/QuickStartEC2Instance.html#d0e22325\" class=\"preview__body--description--blue\" target=\"_blank\">IAM\npolicy</a> that\ndefines the minimal set of permissions necessary for the <a href=\"https://github.com/kubernetes/autoscaler/blob/master/cluster-autoscaler/README.md\" class=\"preview__body--description--blue\" target=\"_blank\">Kubernetes Cluster\nAutoscaler</a>. This policy can then be\nattached to the EC2 instance profile of the worker nodes in a Kubernetes cluster which will allow the autoscaler to\nmanage scaling up and down EC2 instances in targeted Auto Scaling Groups in response to resource utilization.</p>\n<p>See <a href=\"/repos/v0.32.4/terraform-aws-eks/modules/eks-k8s-cluster-autoscaler\" class=\"preview__body--description--blue\">the eks-k8s-cluster-autoscaler module</a> for a module that deploys the Cluster\nAutoscaler to your EKS cluster.</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/v0.32.4/terraform-aws-eks/README.adoc\" class=\"preview__body--description--blue\">root README</a> for instructions on using Terraform modules.</li>\n<li>See the <a href=\"/repos/v0.32.4/terraform-aws-eks/examples/eks-cluster-with-supporting-services\" class=\"preview__body--description--blue\">eks-cluster-with-supporting-services example</a> for example\nusage.</li>\n<li>See <a href=\"/repos/v0.32.4/terraform-aws-eks/modules/eks-k8s-cluster-autoscaler-iam-policy/variables.tf\" class=\"preview__body--description--blue\">variables.tf</a> for all the variables you can set on this module.</li>\n<li>See <a href=\"/repos/v0.32.4/terraform-aws-eks/modules/eks-k8s-cluster-autoscaler-iam-policy/outputs.tf\" class=\"preview__body--description--blue\">outputs.tf</a> for all the variables that are outputed by this module.</li>\n</ul>\n<h2 class=\"preview__body--subtitle\" id=\"attaching-iam-policy-to-workers\">Attaching IAM policy to workers</h2>\n<p>To allow the Cluster Autoscaler to manage Auto Scaling Groups, it needs IAM permissions to monitor and adjust them.\nCurrently, the way to grant Pods IAM privileges is to use the worker IAM profiles provisioned by <a href=\"/repos/v0.32.4/terraform-aws-eks/modules/eks-cluster-workers/README.md#how-do-you-add-additional-iam-policies\" class=\"preview__body--description--blue\">the\neks-cluster-workers module</a>.</p>\n<p>The Terraform templates in this module create an IAM policy that has the required permissions. You then need to use an\n<a href=\"https://www.terraform.io/docs/providers/aws/r/iam_policy_attachment.html\" class=\"preview__body--description--blue\" target=\"_blank\">aws_iam_policy_attachment</a> to attach that\npolicy to the IAM roles of your EC2 Instances.</p>\n<pre><span class=\"hljs-keyword\">module</span> <span class=\"hljs-string\">\"eks_workers\"</span> {\n <span class=\"hljs-comment\"># (arguments omitted)</span>\n}\n\n<span class=\"hljs-keyword\">module</span> <span class=\"hljs-string\">\"k8s_cluster_autoscaler_iam_policy\"</span> {\n <span class=\"hljs-comment\"># (arguments omitted)</span>\n eks_worker_asg_arns = <span class=\"hljs-keyword\">module</span>.eks_workers.eks_worker_asg_arns\n}\n\n<span class=\"hljs-keyword\">resource</span> <span class=\"hljs-string\">\"aws_iam_role_policy_attachment\"</span> <span class=\"hljs-string\">\"attach_k8s_cluster_autoscaler_iam_policy\"</span> {\n role = <span class=\"hljs-keyword\">module</span>.eks_workers.eks_worker_iam_role_name\n policy_arn = <span class=\"hljs-keyword\">module</span>.k8s_cluster_autoscaler_iam_policy.k8s_cluster_autoscaler_policy_arn\n}\n</pre>\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-iam-policy","title":"Repo Browser: EC2 Kubernetes Service (EKS) Cluster","description":"Browse the repos in the Gruntwork Infrastructure as Code Library."}
.circleci
main.tf
