College App with Dockerfile and Kubernetes

1. Create a Dockerfile: This is a text file that tells Docker how to build your application. The Dockerfile for a College app would need to install all the necessary dependencies and configure the application to run in a Docker container.

2. Build your Docker image: Once you have created your Dockerfile, you can build your Docker image by running the following command:

docker build -t <image-name> .

1. Push your Docker image to a registry: You can push your Docker image to a registry so that it can be pulled by other people. There are many different registries available, such as Docker Hub and Google Container Registry.

2. Create a Kubernetes deployment: A Kubernetes deployment is a way to run multiple instances of your application. The Kubernetes deployment for a College app would need to specify the number of instances to run, the Docker image to use, and the Kubernetes resources to allocate to each instance.

3. Expose your application: Once you have created a Kubernetes deployment, you need to expose your application so that it can be accessed from outside of Kubernetes. You can do this by creating a Kubernetes service.

kubectl expose deployment <deployment-name> --port=<port>

1. Test your application: Once you have exposed your application, you can test it by accessing it from your browser or another application.

Here, Dockerfile for a College app:

FROM node:16-alpine

WORKDIR /app

COPY package.json yarn.lock ./

RUN yarn install

COPY . .

EXPOSE 3000

CMD ["yarn", "start"]

This Dockerfile installs Node.js and Yarn, copies the application's source code into the container, and exposes port 3000. The CMD instruction tells Docker to run the yarn start command when the container starts.

Here is an example of a Kubernetes deployment for a College app:

apiVersion: apps/v1
kind: Deployment
metadata:
  name: college-app
spec:
  replicas: 3
  selector:
    matchLabels:
      app: college-app
  template:
    metadata:
      labels:
        app: college-app
    spec:
      containers:
      - name: college-app
        image: <image-name>
        ports:
        - containerPort: 3000

This Kubernetes deployment creates three replicas of the College app. Each replica is assigned the label app: college-app. The template specifies that each container should run the college-app image and expose port 3000.

Here is an example of a Kubernetes service for a College app:

apiVersion: v1
kind: Service
metadata:
  name: college-app
spec:
  selector:
    app: college-app
  ports:
  - port: 80
    targetPort: 3000

This Kubernetes service exposes the College app on port 80. The selector ensures that the service only exposes pods that have the label app: college-app.