• K8s cluster: minikube
• Container registry: Docker Hub

To create and deploy a "Hello World" Express.js app to Kubernetes (k8s), you'll need to follow a few steps. Here's a high-level overview of the process:

1. Set up your development environment:

   • Install Node.js and npm (Node Package Manager) on your machine.
   • Install Docker to build container images.

2. Create an Express.js app:

   • Initialize a new Node.js project: Run npm init in a new directory and follow the prompts.
   • Install Express.js as a dependency: Run npm install express.
   • Create an index.js file.

3. Dockerize the Express.js app:

   • Create a Dockerfile file.

4. Build and push the Docker image:

   • cd k8s-express-hello-world (innermost directory)
   • Build the Docker image: Run docker build -t <Docker ID>/k8s-express-hello-world:latest . in the project directory.
   • docker login
   • Push the image to Docker Hub container registry using docker push <Docker ID>/k8s-express-hello-world:latest.

5. Set up a Kubernetes cluster:

   • Install and configure a Kubernetes Minikube cluster (or k3s, or a managed Kubernetes service such as Google Kubernetes Engine (GKE), Amazon Elastic Kubernetes Service (EKS), or Azure Kubernetes Service (AKS)).

6. Create Kubernetes deployment and service files:

   • https://kubernetes.io/docs/tasks/configure-pod-container/pull-image-private-registry/
   • Create a file named deployment.yaml.
   • Create a file named service.yaml.

7. Deploy the app to Kubernetes:

   • Apply the deployment and service files: Run kubectl apply -f deployment.yaml and kubectl apply -f service.yaml.

1. Verify the deployment:

   • Run kubectl get deployments to check the status of the deployment.
   • Run kubectl get services to get the external IP address of the service.

2. Access deployed application:

   • Run minikube service k8s-express-hello-world-service 🎉