1. Web Server: Containerized Any HTTP Server (eg. node.js)
2. Database Server: Containerized MySQL or any NoSQL
3. Application Server: Containerized lightweight Python or Node.js application

Here, i created one demo-app web-server, db-server and app-server with some basic codes. And, dockerize every services in dockerfile.

then, create one docker-compose file which will handle the multi-container applications.

now run the cmd,

• docker-compose up -d

compose-up-cmd

This cmd will up the container. We can check it from docker desktop too. docker-desktop-view

We can check it from browser now by accessing the url. http://localhost:5000 where the service is running.

web-server

Now, to run these containers in container orchestration tool im using kubernetes and provisioning using minikube. To start minikube,

• minikube start It will start in local.

minikube-start

Now we have to write kubernetes manifest and service file to deploy our application inside multiple pods with proper considerations. So, i created deployments file - app-server-deployment.yml, db-server-deployment.yml and web-server-deployment.yml and for services, i created - app-server-services.yml, db-server-services.yml, web-server-services.yml with LoadBalancer type because we need to ensure the scalability.

now, apply the kubernetes manifest and service file for all 3 services,

• kubectl apply -f app-server-deployment.yml

• kubectl apply -f app-server-services.yml

• kubectl apply -f db-server-deployment.yaml

• kubectl apply -f db-server-services.yml

• kubectl apply -f web-server-deployment.yaml

• kubectl apply -f web-server-services.yml

kubectl get pods kubectl get services

We can check it using kubernetes dashboard too by running

• minikube dashboard minikube dashboard dashboard-kube

As i have configured with 3 replica set when deploying app so we can view 9 services for each 3 pods active;

• kubectl get services
• kubectl get pods replica-created

Finally, we can see the service is running Hello-from-the-web-server and also we can check it from browser too browser

Note: I have also added github ci/cd too