Getting Started with Angular on Kubernetes: Ingress Routing

Kubernetes, the open-source platform for automating deployment, scaling, and management of containerized applications, has become a go-to solution for many data scientists. In this blog post, we’ll explore how to deploy an Angular application on Kubernetes, focusing on ingress routing.

By Saturn Cloud | Tuesday, August 08, 2023 | Miscellaneous

Getting Started with Angular on Kubernetes: Ingress Routing

What is Angular?

Angular is a popular open-source web application framework developed by Google. It’s known for its ability to create dynamic, single-page applications using HTML and TypeScript.

What is Kubernetes?

Kubernetes (K8s) is a powerful system for managing containerized applications in a clustered environment. It provides a framework to run distributed systems resiliently, scaling and updating applications as needed.

What is Ingress Routing?

In Kubernetes, an Ingress is an API object that manages external access to the services in a cluster, typically HTTP. Ingress can provide load balancing, SSL termination, and name-based virtual hosting, which is a crucial aspect when deploying applications like Angular.

Prerequisites

Before we start, make sure you have the following installed:

Docker
Kubernetes
kubectl
Angular CLI

Step 1: Dockerizing your Angular Application

First, we need to containerize our Angular application using Docker. Create a Dockerfile in your project root:

FROM node:14 as build
WORKDIR /app
COPY . .
RUN npm install
RUN npm run build --prod

FROM nginx:1.19.0-alpine
COPY --from=build /app/dist/* /usr/share/nginx/html/

This Dockerfile first creates a build environment, installs the node packages, and builds the application. Then, it creates a new stage, copies the built application from the previous stage, and serves it using Nginx.

Step 2: Creating a Kubernetes Deployment

Next, we create a Kubernetes Deployment configuration. The Deployment instructs Kubernetes how to create and update instances of your application.

Create a file angular-deployment.yaml:

apiVersion: apps/v1
kind: Deployment
metadata:
  name: angular-deployment
spec:
  replicas: 3
  selector:
    matchLabels:
      app: angular
  template:
    metadata:
      labels:
        app: angular
    spec:
      containers:
      - name: angular
        image: <your-docker-image>
        ports:
        - containerPort: 80

Replace <your-docker-image> with the Docker image of your Angular application.

Step 3: Creating a Kubernetes Service

A Kubernetes Service is an abstraction which defines a logical set of Pods and a policy by which to access them. Create a file angular-service.yaml:

apiVersion: v1
kind: Service
metadata:
  name: angular-service
spec:
  selector:
    app: angular
  ports:
    - protocol: TCP
      port: 80
      targetPort: 9376

Step 4: Setting up Ingress Routing

Finally, we set up Ingress to route HTTP and HTTPS traffic to our service. Create a file angular-ingress.yaml:

apiVersion: networking.k8s.io/v1
kind: Ingress
metadata:
  name: angular-ingress
spec:
  rules:
  - host: <your-domain>
    http:
      paths:
      - pathType: Prefix
        path: "/"
        backend:
          service:
            name: angular-service
            port:
              number: 80

Replace <your-domain> with your domain name.

Conclusion

In this post, we’ve walked through the process of deploying an Angular application on Kubernetes, with a focus on ingress routing. Kubernetes provides a robust and scalable solution for managing containerized applications, and with Angular, you can create dynamic, single-page applications that are ready for deployment on any scale.

Remember, Kubernetes is a powerful tool, but with great power comes great responsibility. Always ensure your configurations are secure and follow best practices for deploying applications in a Kubernetes environment.

References

Keywords: Angular, Kubernetes, Ingress, Docker, Deployment, Service, Data Science, Web Application, Containerization, Load Balancing, SSL Termination, Virtual Hosting, Scaling, Updating, Configuration, Best Practices

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