expert.sh

#!/usr/bin/env bash

set -euo pipefail

# Default values
EKS_CLUSTER="${EKS_CLUSTER:-test-cluster}"
EKS_VERSION="${EKS_VERSION:-1.27}"
AWS_REGION="${AWS_REGION:-us-west-2}"
NODE_TYPE="${NODE_TYPE:-t3.medium}"
NODE_COUNT="${NODE_COUNT:-3}"
NODE_MIN="${NODE_MIN:-1}"
NODE_MAX="${NODE_MAX:-5}"
ADDONS="${ADDONS:-coredns,vpc-cni,kube-proxy}"

# Function to display usage information
usage() {
    echo "Usage: $0 [options]"
    echo "Options:"
    echo "  -c, --cluster NAME    Set EKS cluster name (default: $EKS_CLUSTER)"
    echo "  -v, --version VERSION Set Kubernetes version (default: $EKS_VERSION)"
    echo "  -r, --region REGION   Set AWS region (default: $AWS_REGION)"
    echo "  -t, --node-type TYPE  Set node instance type (default: $NODE_TYPE)"
    echo "  -n, --node-count NUM  Set initial node count (default: $NODE_COUNT)"
    echo "  --min-nodes NUM       Set minimum node count (default: $NODE_MIN)"
    echo "  --max-nodes NUM       Set maximum node count (default: $NODE_MAX)"
    echo "  -a, --addons LIST     Comma-separated list of addons (default: $ADDONS)"
    echo "  -h, --help            Display this help message"
    exit 1
}

# Parse command line arguments
while [[ $# -gt 0 ]]; do
    key="$1"
    case $key in
        -c|--cluster) EKS_CLUSTER="$2"; shift; shift ;;
        -v|--version) EKS_VERSION="$2"; shift; shift ;;
        -r|--region) AWS_REGION="$2"; shift; shift ;;
        -t|--node-type) NODE_TYPE="$2"; shift; shift ;;
        -n|--node-count) NODE_COUNT="$2"; shift; shift ;;
        --min-nodes) NODE_MIN="$2"; shift; shift ;;
        --max-nodes) NODE_MAX="$2"; shift; shift ;;
        -a|--addons) ADDONS="$2"; shift; shift ;;
        -h|--help) usage ;;
        *) echo "Unknown option: $1"; usage ;;
    esac
done

# Check if eksctl is installed
if ! command -v eksctl &>/dev/null; then
    echo "eksctl is not installed. Please install it first."
    exit 1
fi

# Check if AWS CLI is configured
if ! aws sts get-caller-identity &>/dev/null; then
    echo "AWS CLI is not configured. Please run 'aws configure' first."
    exit 1
fi

# Function to create EKS cluster
create_eks_cluster() {
    echo "Creating EKS cluster: $EKS_CLUSTER"
    eksctl create cluster \
        --name "$EKS_CLUSTER" \
        --version "$EKS_VERSION" \
        --region "$AWS_REGION" \
        --nodegroup-name standard-workers \
        --node-type "$NODE_TYPE" \
        --nodes "$NODE_COUNT" \
        --nodes-min "$NODE_MIN" \
        --nodes-max "$NODE_MAX" \
        --managed \
        --addons "$ADDONS" \
        --with-oidc \
        --ssh-access \
        --ssh-public-key ~/.ssh/id_rsa.pub \
        --tags "Environment=Test,Project=EKSDemo" \
        --asg-access \
        --full-ecr-access \
        --alb-ingress-access
}

# Main execution
echo "EKS Cluster Configuration:"
echo "  Cluster Name: $EKS_CLUSTER"
echo "  Kubernetes Version: $EKS_VERSION"
echo "  AWS Region: $AWS_REGION"
echo "  Node Type: $NODE_TYPE"
echo "  Initial Node Count: $NODE_COUNT"
echo "  Min Nodes: $NODE_MIN"
echo "  Max Nodes: $NODE_MAX"
echo "  Addons: $ADDONS"

read -p "Do you want to proceed with this configuration? (y/n) " -n 1 -r
echo
if [[ $REPLY =~ ^[Yy]$ ]]; then
    create_eks_cluster
else
    echo "Aborted."
    exit 1
fi

echo "EKS cluster creation complete. You can now use 'kubectl' to interact with the cluster."