Terraform Configuration for AWS EKS Cluster

Overview

• This Terraform configuration sets up an AWS EKS (Elastic Kubernetes Service) Cluster.
• It includes configurations for providers, variables, main settings, a VPC, an EKS cluster, and outputs.

Requirements

• Terraform v1.6.3 or higher.
• AWS Provider version ~> 5.25.0.
• Additional providers: random (> 3.5.1), tls (> 4.0.4), time (> 0.10.0), cloudinit (> 2.3.2), kubernetes (>= 2.23.2).

Setup

• Backend: AWS S3 for state management.
  • Bucket: Specified in configuration (replace <bucket-name> with actual bucket name).
  • Key: terraform.tfstate.
  • Region: us-east-1.

Configuration Files

1. variables.tf: Defines variables like AWS region and cluster name.
   • Default region: us-east-1.
   • Default cluster name: quizapp-eks.
2. main.tf: Configures the Kubernetes and AWS providers.
   • Sets up the connection to the EKS cluster.
3. vpc.tf: Sets up the VPC for the EKS cluster.
   • CIDR block: 10.20.0.0/16.
   • Configures both private and public subnets.
4. eks-cluster.tf: Configures the EKS cluster.
   • Cluster version: 1.29.
   • Node groups: master and worker with specified instance types and sizes.
5. outputs.tf: Outputs the cluster name, endpoint, region, and security group ID.

Usage

• Initialize Terraform: terraform init.
• Validate Terraform code: terraform validate.
• Plan Terraform: terraform plan.
• Apply configuration: terraform apply.
• Validate outputs after successful apply.

Notes

• Replace placeholder values (like <bucket-name>) with actual values.
• Ensure you have appropriate AWS permissions.

Additional Information

Terraform & AWS CLI Installation

A) Prerequisites

• Install Terraform CLI
• Install AWS CLI
• Install VS Code Editor - recommended for this course
• Install HashiCorp Terraform plugin for VS Code - recommended

B) MACOS - Terraform Install

• Download Terraform MAC
• Install CLI
• Unzip the package

# Copy binary zip file to a folder
mkdir /Users/<YOUR-USER>/Documents/terraform-install
COPY Package to "terraform-install" folder

# Unzip
unzip <PACKAGE-NAME>
unzip terraform_1.0.10_darwin_amd64.zip

# Copy terraform binary to /usr/local/bin
echo $PATH
mv terraform /usr/local/bin

# Verify Version
terraform version

# To Uninstall Terraform (NOT REQUIRED)
rm -rf /usr/local/bin/terraform

C) MACOS - Install VSCode Editor and terraform plugin

• Microsoft Visual Studio Code Editor
• Hashicorp Terraform Plugin for VS Code

D) MACOS - Install AWS CLI

• AWS CLI Install
• Install AWS CLI - MAC

# Install AWS CLI V2
curl "https://awscli.amazonaws.com/AWSCLIV2.pkg" -o "AWSCLIV2.pkg"
sudo installer -pkg AWSCLIV2.pkg -target /
which aws
aws --version

# Uninstall AWS CLI V2 (NOT REQUIRED)
which aws
ls -l /usr/local/bin/aws
sudo rm /usr/local/bin/aws
sudo rm /usr/local/bin/aws_completer
sudo rm -rf /usr/local/aws-cli

E) MACOS - Configure AWS Credentials

• Pre-requisite: Should have AWS Account.

  • Create an AWS Account

• Role: -If your terraform server is in the cloud, then create a role and attach the role to your server.

• Generate Security Credential s using AWS Management Console

  • Go to Services -> IAM -> Users -> "Your-Admin-User" -> Security Credentials -> Create Access Key

• Configure AWS credentials using SSH Terminal on your local desktop

Configure AWS Credentials in command line

$ aws configure
Default region name [None]: us-west-2
Default output format [None]: json

# Verify if we are able list S3 buckets
aws s3 ls

• Verify the AWS Credentials Profile

cat $HOME/.aws/credentials

#Command to reset your AWS credentials incase of a credentials error:

$ for var in AWS_ACCESS_KEY_ID AWS_SECRET_ACCESS_KEY AWS_SESSION_TOKEN AWS_SECURITY_TOKEN ; do eval unset $var ; done

F) Windows OS - Terraform & AWS CLI Install

• Download Terraform

• Install CLI

• Unzip the package

• Create new folder binaries

• Copy the terraform.exe to a binaries

• Set PATH in windows How to set the windows path: Windows 8/10 In Search, search for and then select: System (Control Panel) Click the Advanced system settings link. Click Environment Variables. In the section System Variables find the PATH environment variable and select it. Click Edit. If the PATH environment variable does not exist, click New. In the Edit System Variable (or New System Variable) window, specify the value of the PATH environment variable. Click OK. Close all remaining windows by clicking OK.

• Install AWS CLI

Terraform install on windows using a packet manager

-Install terraform on windows using the windows package manager(Use powershell and install as administrator). $ choco install terraform

G) Linux OS - Terraform & AWS CLI Install

• Download Terraform
• Linux OS - Terraform Install

Install Terraform on Ubuntu:

 $sudo apt-get update && sudo apt-get install -y gnupg software-properties-common curl
 $curl -fsSL https://apt.releases.hashicorp.com/gpg | sudo apt-key add -
 $sudo apt-add-repository "deb [arch=amd64] https://apt.releases.hashicorp.com $(lsb_release -cs) main"
 $sudo apt-get update && sudo apt-get install terraform

Install Terraform on RHEL:

  **Install aws cli**
  sudo yum update -y
  sudo yum install curl unzip wget -y  
  curl "https://awscli.amazonaws.com/awscli-exe-linux-x86_64.zip" -o "awscliv2.zip"
  unzip awscliv2.zip
  sudo ./aws/install

  **Install Terraform**
  a) *Download binary*
  sudo yum update -y
  sudo yum install wget unzip -y
  sudo wget https://releases.hashicorp.com/terraform/1.4.4/terraform_1.1.4_linux_amd64.zip
  sudo unzip terraform_1.1.4_linux_amd64.zip -d /usr/local/bin
  terraform -v

  b) *Install from hashicorp repo*
 sudo yum install -y yum-utils
 sudo yum-config-manager --add-repo https://rpm.releases.hashicorp.com/RHEL/hashicorp.repo
 sudo yum -y install terraform