Kiruha01 / gnc-kuber

Task for Grid and Cloud technologies

Kubernetes task

Description

Deploy a backend-frontend app using Kubernetes.

• Backend: application that listens to a port and sends some response if a message comes there. Must be replicated.
• Frontend: application that sends incoming requests to the backend.
• Frontend must have an IP that can be used outside the cluster. Use Kubernetes Services.

Needed: backend Deployment YAML, frontend Deployment YAML, backend Service YAML, frontend Service YAML, list of commands for everything to launch and test + any extra files for the system to work.

Applications

The Caesar cipher is implemented in this task.

back

The server application is written in python Flask.

API methods:

• GET /encode?text=<str>&offset=<int> - encode input text by given offset.

front

Nginx server that serves frontend static files and proxies API requests to the backend.

Application files:

• html - folder with static files
• nginx.conf - configuration file for Nginx

Reproducible steps

The backend and frontend Docker images are pulled from the GitHub registry of this repository.

1. Start minikube cluster

   minikube start

2. Deploy backend

   kubectl apply -f kubernetes/back/deployment-back.yaml
   kubectl apply -f kubernetes/back/service-back.yaml

3. Deploy frontend

   kubectl apply -f kubernetes/front/deployment-front.yaml
   kubectl apply -f kubernetes/front/service-front.yaml

4. Bind the external IP address to our cluster

   minikube service nginx-server

5. Open browser and navigate to url in 4th step output