🚀 Kubernetes_101_Basics_and_Lab

This repository contains the necessary configuration files to build a simple Node.js server, containerize it with Docker, and deploy it to a Kubernetes cluster.

📋 Table of Contents

1. Structure
2. Prerequisites
   1. Docker Engine
   2. Minikube
   3. Kubectl
3. Setup Steps
4. Exploring Kubernetes Further
5. Cleaning up

📂 Structure

The repository contains the following files:

• Dockerfile: The Docker configuration file to build a Docker image of the Node.js application.
• server.js: The Node.js server script that creates a basic HTTP server.
• my-node-app-deployment.yaml: The Kubernetes Deployment configuration file to deploy the application on a Kubernetes cluster.
• my-node-app-service.yaml: The Kubernetes Service configuration file to expose the application on a Kubernetes cluster.

📌 Prerequisites

🐳 Docker Engine

Follow the instructions here to install.

• For Ubuntu, follow the instructions here.
  • Additionally: If you are using Ubuntu, you can use the provided script to install Docker Engine.
  • Navigate to the scripts directory using the command below and run:

    cd scripts
    chmod +x install_docker_engine_ubuntu.sh
    ./install_docker_engine_ubuntu.sh
    

• For Debian, follow the instructions here.

🚜 Minikube

Follow the instructions here to install.

• For Ubuntu, you can also use the provided script to install Minikube.
  • Additionally: If you are using Ubuntu, you can use the provided script to install Minikube.
  • Navigate to the scripts directory and run:

    cd scripts
    chmod +x install_minikube_ubuntu.sh
    ./install_minikube_ubuntu.sh

⚙️ Kubectl

The Kubernetes command-line tool. You can install it by following the instructions here.

• For Ubuntu, follow the instructions here.
  • Additionally: If you are using Ubuntu, you can use the provided script to install Kubectl.
  • Navigate to the scripts directory using the command below and run:

    cd scripts
    chmod +x install_kubectl_ubuntu.sh
    ./install_kubectl_ubuntu.sh
    

---

🚀 Setup Steps

1. Build the Docker image:

   Navigate to the repository's root directory and run:

   docker build -t my-node-app .

2. Start the minikube cluster:

   minikube start

3. Deploy the application: Apply the Deployment and Service configurations with the following commands:

   kubectl apply -f my-node-app-deployment.yaml
   kubectl apply -f my-node-app-service.yaml

4. Check the Deployment and Service:

   kubectl get deployments
   kubectl get services

5. Access the application:

   minikube service my-node-app-service

   This command will automatically open your application in a web browser.

That's it! You should now have a simple Node.js server running on your local Kubernetes cluster. 👏

🕵️‍♀️ Exploring Kubernetes Further

Kubernetes provides several resources that you can use to further manage your application. Here are a few examples:

• Pods: These are the smallest deployable units of computing that can be created and managed in Kubernetes.

  # Get information about Pods
  kubectl get pods
  
  # Get detailed information about a specific Pod
  kubectl describe pod [POD_NAME]

• Services: A way to expose an application running on a set of Pods as a network service.

  # Get information about Services
  kubectl get services
  
  # Get detailed information about a specific Service
  kubectl describe service [SERVICE_NAME]

• Volumes: A directory containing data, accessible to the containers in a pod.

  # Get detailed information about a specific Volume by describing the Pod
  kubectl describe pod [POD_NAME]

• Namespaces: A way to divide cluster resources between multiple users.

  # Get information about Namespaces
  kubectl get namespaces
  
  # Get detailed information about a specific Namespace
  kubectl describe namespace [NAMESPACE_NAME]

You can use the kubectl get command followed by the resource type to get information about that resource. For example, kubectl get pods will give you information about the running pods. You can also use kubectl get all to get information about all the resources in the Kubernetes cluster.

Replace [POD_NAME], [SERVICE_NAME], and [NAMESPACE_NAME] with the name of your Pod, Service, or Namespace respectively when running the describe commands.

🧹 Cleaning up

To delete the Deployment and Service, run:

kubectl delete deployment my-node-app-deployment
kubectl delete service my-node-app-service

To stop the minikube cluster, run:

minikube stop