How to Create EKS Cluster Using AWS CodeBuild

	
version: 0.1
    
phases:
  install:
    commands:
      - echo Installing app dependencies...
      - curl -o kubectl https://s3.us-west-2.amazonaws.com/amazon-eks/1.24.7/2022-10-31/bin/darwin/amd64/kubectl   
      - chmod +x ./kubectl
      - chmod +x ./aws-auth.sh
      - mkdir -p $HOME/bin && cp ./kubectl $HOME/bin/kubectl && export PATH=$PATH:$HOME/bin
      - echo 'export PATH=$PATH:$HOME/bin' >> ~/.bashrc
      - source ~/.bashrc
      - curl --silent --location "https://github.com/weaveworks/eksctl/releases/latest/download/eksctl_$(uname -s)_amd64.tar.gz" | tar xz -C /tmp
      - mv /tmp/eksctl /usr/local/bin
  pre_build:
    commands:
      - echo Entered the pre_build phase...
      - echo Logging in to Amazon EKS...
      - eksctl create cluster --name $AWS_CLUSTER_NAME --region $REGION --nodegroup-name $AWS_CLUSTER_NAME-ng --nodes $NODES --node-type $NODE_TYPE --nodes-min $NODES_MIN --nodes-max $NODES_MAX --ssh-access --ssh-public-key $SSH_PUBLIC_KEY --managed --node-volume-size=$NODE_VOL_SIZE --tags environment=dev --tags owner=$CODEBUILD_INITIATOR
      - aws eks --region $AWS_DEFAULT_REGION update-kubeconfig --name $AWS_CLUSTER_NAME
  build:
    commands:
      - echo Entered the build phase...
      - echo Change directory to secondary source
      - aws sts get-caller-identity
      - kubectl get configmap -n kube-system aws-auth -o yaml
      - ls
      - ./aws-auth.sh > aws-auth.yaml
      - cat aws-auth.yaml
													

And then create aws-auth.sh file. ( replace xxxxxxxxxx with your AWS account ID )

												
#!/usr/bin/env bash

set -o errexit
set -o nounset
set -o pipefail

IAM_GROUP=${1:-Admin}
EKS_ROLE_ARN=${2:-arn:aws:iam::xxxxxxxxxx:role/service-role/codebuild-eks-cluster-automation-service-role}
RBAC_GROUP=${3:-system:masters}

mapusers(){
    local IAM_GROUP_NAME=$1
    local RBAC_GROUP=$2
    local USER_LIST=""
    
    USER_LIST="$(aws iam get-group --group-name "${IAM_GROUP_NAME}" --query 'Users[*].Arn' --output text)"

    for user in ${USER_LIST}
    do
    echo -n "
    - userarn: ${user}
      username: ${user#*/}
      groups:
        - ${RBAC_GROUP}"
    done
}

mapclusters() {
  configmap="$(kubectl get configmap aws-auth -n kube-system -o yaml| grep rolearn: | sed 's/rolearn://g' )"
  for p in $configmap
  do
    echo -n "
    - rolearn: ${p}
      username: system:node:{{EC2PrivateDNSName}}
      groups:
        - system:bootstrappers
        - system:nodes"
  done
}

cat << EOF | kubectl apply -f -
apiVersion: v1
kind: ConfigMap
metadata:
  name: aws-auth
  namespace: kube-system
data:
  mapRoles: |
    - rolearn: ${EKS_ROLE_ARN}
      username: system:node:{{EC2PrivateDNSName}}
      groups:
        - system:bootstrappers
        - system:nodes
      $(mapclusters)
  mapUsers: |
$(mapusers "${IAM_GROUP}" "${RBAC_GROUP}") 
EOF

Create a git repo and push those files over there. Once these two files have been created then you either create an AWS CodeBuild project manually or via CloudFormation template. Here I give you one sample CF Template which creates the CodeBuild Project.

AWSTemplateFormatVersion: 2010-09-09
Parameters:  
	AWSCLUSTERNAME:
	Description: "AWS CLUSTER NAME"
	Type: String
	Default: ""  
	GITURL:
	Description: "Github Url"
	Type: String
	Default: ""  
	NODETYPE:
	Description: "NODE TYPE"
	Type: String
	Default: "t3.medium"
	serviceRoleForCodeBuild:
	Description: "Name of the service role"
	Type: String
	Default: ""
	NODES: 
	Description: "NODES"
	Type: String
	Default: "2"
	NODESMIN: 
	Description: "NODES MIN"
	Type: String
	Default: "1"
	NODESMAX: 
	Description: "NODES MAX"
	Type: String
	Default: "4" 
	BUILDSPECFILE: 
	Description: "Buildspec File name"
	Type: String
	Default: "buildspec.yml"
	NODEVOLSIZE:
	Description: "NODE VOLUME SIZE"
	Type: String
	Default: "10"  
	SSHPUBLICKEY:
	Description: "SSH KEY PAIRS"
	Type: String
	Default: "ssh-key-ohio"
	NGINIXCONTROLLERVERSION:
	Description: "NGINIX INGRESS CONTROLLER VERSION"
	Type: String
	Default: "v1.0.0"
	ENVNAME:
	Description: "Environment dev/stg/prod"
	Type: String
	Default: ""
	
Resources:    
	microserviceBuildProject:
	Type: AWS::CodeBuild::Project    
	Properties:
		Name: !Join [ "-", ["cb", "eksClusterCreation", !Ref ENVNAME] ]
		Description: "Pipeline for Micro Services"
		ServiceRole: !Ref serviceRoleForCodeBuild
		Artifacts:
		Type: no_artifacts
		Environment:
		Type: LINUX_CONTAINER
		Image: "aws/codebuild/amazonlinux2-x86_64-standard:4.0"
		ComputeType: BUILD_GENERAL1_SMALL
		PrivilegedMode: True 
		EnvironmentVariables:
			- Name: AWS_CLUSTER_NAME
			Type: PLAINTEXT
			Value: !Ref AWSCLUSTERNAME
			- Name: NODE_TYPE
			Type: PLAINTEXT
			Value: !Ref NODETYPE          
			- Name: NODES
			Type: PLAINTEXT
			Value: !Ref NODES          
			- Name: NODES_MIN
			Type: PLAINTEXT
			Value: !Ref NODESMIN
			- Name: NODES_MAX
			Type: PLAINTEXT
			Value: !Ref NODESMAX          
			- Name: REGION
			Type: PLAINTEXT
			Value: !Ref "AWS::Region"          
			- Name: NODE_VOL_SIZE
			Type: PLAINTEXT
			Value: !Ref NODEVOLSIZE          
			- Name: SSH_PUBLIC_KEY
			Type: PLAINTEXT
			Value: !Ref SSHPUBLICKEY
			- Name: CB_SERVICE_ROLE
			Type: PLAINTEXT
			Value: !Ref serviceRoleForCodeBuild
			- Name: NGINIX_CONTROLLER_VERSION
			Type: PLAINTEXT
			Value: !Ref NGINIXCONTROLLERVERSION
			
		Source:    
		Auth:
			Resource: !Join [ "", ["arn:aws:codebuild:", !Ref "AWS::Region" , ":" , !Ref "AWS::AccountId" ,  ":token/github" ] ]
			Type: OAUTH    
		Type: GITHUB
		Location: !Ref GITURL
		BuildSpec: !Ref BUILDSPECFILE
		GitCloneDepth: 1
		GitSubmodulesConfig: 
			FetchSubmodules: false 
		ReportBuildStatus: false 
		InsecureSsl: false      
		TimeoutInMinutes: 60
		SourceVersion: !Ref ENVNAME
		EncryptionKey: !Join [ "", ["arn:aws:kms:", !Ref "AWS::Region", ":" , !Ref "AWS::AccountId"  , ":alias/aws/s3" ] ]
		LogsConfig: 
		CloudWatchLogs:
			Status: ENABLED 
			GroupName: "microServiceDeploymentPipeline"		

This CF (CloudFormation) template has a lot of parameters that you can use to fine-tune your installation. This template assumes that you have created one ssh key file named “ssh-key-ohio”. If you want to use a different ssh key file then just replace the name with your ssh key file name. The next step is to create a CF Stack using the template which is given above. This will create one AWS CodeBuild project that can be used to create the EKS cluster. Once the CodeBuild project is being created then go to the AWS CodeBuild project and click the Start Build button to start the process. If things have been configured as described above then finally it will create the desired EKS Cluster with your own SSH Key pair and desired node size. Hope this helps you to get started with AWS EKS using CodeBuild.