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AWS EKS Cluster IaC

Deploy a AWS EKS Cluster using Terraform in minutes.

Setup

Set you AWS account credentials on Github Repo

1.On your Github Repo Settings, in Action under Secrets and variables create two new Repository Secrets and their corresponding values:

  • AWS_ACCESS_KEY_ID: AWS Account Access Key

  • AWS_SECRET_ACCESS_KEY: AWS Account Secret Key

Set you tf states bucket

  1. On AWS create a new bucket where the terraform states will be stored.

  2. Change the name of the bucket in the backend s3 configuration on the provider.tf file. On bucket replace the existing value with your own bucket name.

Setting tfvars as Github Secrets

Instead of using a .tfvars for storing the different variable values, Github environments secrets are used.The following steps cover how to do it:

  1. On your Github Repo Settings, in Action under Secrets and variables create a new environment. For example: development

  2. Create the following secrets and add the corresponding types of values for each one. These are the ones set for this project:

    • AWS_REGION: ex: us-east-1
    • EKS_CLUSTER_EC2_INSTANCE_TYPE: ex: m3.large
    • EKS_VPC_SECURITY_GROUP_ID: ex: sg-062f05b98b1edfefaeasdadaedaed
    • EKS_MIN_NODE_SIZE: 1
    • EKS_DESIRED_NODE_SIZE: 2
    • EKS_MAX_NODE_SIZE: 10
    • NODE_GROUP_AUTOSCALING_POLICY_ARN: ex: arn:aws:iam::23428842523567:policy/NameOFTHEPOLICY
    • EKS_CLUSTER_NAME: ex: example-cluster
    • VPC_CIDR_BLOCK: ex: 10.0.0.0/16
    • VPC_ID: ex: vpc-232fsr9fs9229frf
    • VPC_PRIVATE_SUBNETS_1: ex: subnet-22938423489239"
    • VPC_PRIVATE_SUBNETS_2: ex: subnet-22938423489224"

How to Deploy

To deploy a new cluster with the given values just go to the Actions section of you repository and click on the Deploy/update infrastructure. There, go the Run workflow button and choose the environment you wish to deploy. The deployment will begin. It should take about 10 minutes for the cluster to be deployed on AWS EKS.

Installing the cluster autoscaler

For now the installation must be done after the cluster is created via helm using the following commands:

Add the repo:

helm repo add autoscaler https://kubernetes.github.io/autoscaler

Install the chart on the cluster:

helm install my-release autoscaler/cluster-autoscaler \
    --set autoDiscovery.clusterName=<CLUSTER NAME> \
    --set awsRegion=<YOUR AWS REGION>

Installing the vertical pods autoscaler

kubectl apply -f https://raw.githubusercontent.com/kubernetes/autoscaler/vpa-release-1.0/vertical-pod-autoscaler/deploy/vpa-v1-crd-gen.yaml
kubectl apply -f https://raw.githubusercontent.com/kubernetes/autoscaler/vpa-release-1.0/vertical-pod-autoscaler/deploy/vpa-rbac.yaml

Installing Metrics Server

To install the metrics server use the following command:

kubectl apply -f https://github.com/kubernetes-sigs/metrics-server/releases/latest/download/components.yaml

Autoscaling permissions on AWS

Create an Autoscaler Policy in AWS to attach to the cluster. Use the following configuration:

{
    "Version": "2012-10-17",
    "Statement": [
        {
            "Action": [
                "autoscaling:DescribeAutoScalingGroups",
                "autoscaling:DescribeAutoScalingInstances",
                "autoscaling:DescribeLaunchConfigurations",
                "autoscaling:DescribeTags",
                "autoscaling:SetDesiredCapacity",
                "autoscaling:TerminateInstanceInAutoScalingGroup",
                "ec2:DescribeLaunchTemplateVersions"
            ],
            "Resource": "*",
            "Effect": "Allow"
        }
    ]
}