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HOW TO

EKS cluster is created using an opensource tool called eksctl, which is from weaveworks and officially supported by AWS.

Download the tool from https://github.com/weaveworks/eksctl/releases/tag/v0.72.0

To use the kubeconfig file from aws, you need aws-authenticator. Download the aws authenticator from https://github.com/kubernetes-sigs/aws-iam-authenticator/releases

To Create cluster

eksctl create cluster -f eks_cluster_config.yaml --profile `aws-profile-name`

To Enable cluster Autoscaler

Add following labels to the node group in aws console

k8s.io/cluster-autoscaler/<my-cluster> 	owned
k8s.io/cluster-autoscaler/enabled 	true

Create an IAM policy

Replace the filed

{
    "Version": "2012-10-17",
    "Statement": [
        {
            "Sid": "VisualEditor0",
            "Effect": "Allow",
            "Action": [
                "autoscaling:SetDesiredCapacity",
                "autoscaling:TerminateInstanceInAutoScalingGroup"
            ],
            "Resource": "*",
            "Condition": {
                "StringEquals": {
                    "aws:ResourceTag/k8s.io/cluster-autoscaler/<my-cluster>": "owned"
                }
            }
        },
        {
            "Sid": "VisualEditor1",
            "Effect": "Allow",
            "Action": [
                "autoscaling:DescribeAutoScalingInstances",
                "autoscaling:DescribeAutoScalingGroups",
                "ec2:DescribeLaunchTemplateVersions",
                "autoscaling:DescribeTags",
                "autoscaling:DescribeLaunchConfigurations"
            ],
            "Resource": "*"
        }
    ]
}

aws iam create-policy \
    --policy-name AmazonEKSClusterAutoscalerPolicy \
    --policy-document file://cluster-autoscaler-policy.json

Create IAM Role and Attach to IAM policy

eksctl create iamserviceaccount \
  --cluster=<my-cluster> \
  --namespace=kube-system \
  --name=cluster-autoscaler \
  --attach-policy-arn=arn:aws:iam::<111122223333>:policy/<AmazonEKSClusterAutoscalerPolicy> \
  --override-existing-serviceaccounts \
  --approve

Deploy the Cluster Autoscaler

Change the REPLACE* variables in the file

kubectl apply -f cluster-autoscaler-autodiscover.yaml

Note:

To get the complete list of options for the config file, run the below command or, refer

eksctl create cluster --dry-run > cluster_config.yaml