rstraining4/2024-stocks-app-eks

🚀 Kubernetes Stocks App - Cloud Native Development

EKS Cluster and Stocks Cloud Native App Deployment

The following instructions are provided to demonstrate how to provision a new EKS cluster and automatically deploy a fully functional Stocks cloud native web application.

An equivalent ECS setup is located here: https://github.com/cloudacademy/stocks-app-ecs

Kubernetes Architecture

Two different Kubernetes architectures are provided for the deployment of the Stocks cloud native web app. The main difference between architectures is the Stock API routing path. To swap between the different architectures, set the k8s.stocks_app_architecture local variable to be either arch1 or arch2.

locals {
  name        = "cloudacademydevops"
  environment = "prod"

  vpc_cidr = "10.0.0.0/16"
  azs      = slice(data.aws_availability_zones.available.names, 0, 2)
  //returns
  #   tolist([
  #   "us-west-2a",
  #   "us-west-2b"
  # ])

  k8s = {
    stocks_app_architecture = "arch1" #either arch1 or arch2

    cluster_name   = "${local.name}-eks-${local.environment}"
    version        = "1.27"
    instance_types = ["m5.large"]
    capacity_type  = "ON_DEMAND"
    disk_size      = 10
    min_size       = 2
    max_size       = 2
    desired_size   = 2
  }

  rds = {
    master_username = "root"
    master_password = "followthewhiterabbit"
    db_name         = "cloudacademy"
    scaling_min     = 2
    scaling_max     = 4
  }
}

Architecture 1 (arch1):

Architecture 2 (arch2):

Web Application Architecture

The Stocks cloud native web app consists of the following 3 main components:

Stocks Frontend (App)

Implements a web UI using the following languages/frameworks/tools:

• React 16
• Yarn
• Nginx

Source Code and Artifacts:

• GitHub Repo: https://github.com/cloudacademy/stocks-app
• Container Image: cloudacademydevops/stocks-app:v2

Stocks API

Implements a RESTful based API using the following languages/frameworks/tools:

• Java 17
• Spring Boot
• Maven 3

Source Code and Artifacts:

• GitHub Repo: https://github.com/cloudacademy/stocks-api
• Container Image: cloudacademydevops/stocks-api:v2

Stocks DB

Aurora RDS DB (serverless v1) SQL database:

• MySQL 5.7

Prerequisites

Ensure that the following tools are installed and configured appropriately.

• Terraform CLI
• AWS CLI
• Helm CLI
• Kubectl CLI

Note: The terraforming commands below have been tested successfully using the following versions:

• terraform: 1.5.3
• aws: aws-cli/2.13.2
• helm: 3.12.2
• kubectl: 1.27.4

Installation

1. Application Deployment

   1.1. Initialise the Terraform working directory. Execute the following commands:

   cd terraform
   terraform init
   

   1.2. Provision a new EKS cluster and deploy the Stocks cloud native application automatically. Execute the following command:

   terraform apply -auto-approve
   

2. Confirm Access to the EKS Cluster

   2.1. Examine the EKS nodes setup. If this command returns successfully then the EKS cluster and access to it has been established successfully.

   kubectl get nodes
   

   If the previous command errors out due to an authentication issue, consider running the following AWS CLI command to re-establish a KUBECONFIG settings file:

   export KUBECONFIG=$(pwd)/config
   aws eks --region ap-south-1 update-kubeconfig --name cloudacademydevops-eks
   

3. Examine EKS Cluster Resources

   3.1. Check Namespaces

   kubectl get ns
   

   3.2. Check Ingress Controller Setup

   kubectl get all -n nginx-ingress
   

   3.3. Check Cloud Native App Setup

   kubectl get all,ingress,secret -n cloudacademy
   

4. Examine Aurora RDS DB

   4.1. List Database Clusters

   aws rds describe-db-clusters --region us-west-2
   

   4.2. List Database Cluster Endpoints

   aws rds describe-db-cluster-endpoints --db-cluster-identifier cloudacademy --region us-west-2
   

5. Generate and Test Stocks API Endpoint

   Execute the following command to generate Stocks API URL:

   echo http://$(kubectl get ing -n cloudacademy public -o jsonpath="{.spec.rules[0].host}")/api/stocks/csv
   

   Copy the URL from the previous output and browse to it within your own browser. Confirm that the Stocks CSV formatted data is accessible.

6. Generate and Test Stocks APP (frontend) Endpoint

   Execute the following command to generate Stocks API URL:

   echo http://$(kubectl get ing -n cloudacademy public -o jsonpath="{.spec.rules[0].host}")
   

   Copy the URL from the previous output and browse to it within your own browser. Confirm that the Stocks App (frontend) loads successfully, complete with stocks data.