VotingApp

The VotingApp was originally created by Docker, it’s an application mainly used for demos and follows a microservices architecture.

While this application may not adhere to all architectural best practices, it serves as a great example of an application utilizing multiple languages, various databases, and is an excellent way to learn concepts related to Docker and Kubernetes.

The VotingApp consists of 7 microservices as illustrated in the following diagram:

• vote-ui: A Vue.js frontend that allows users to choose between Cat and Dog
• vote: A backend API built with Python / Flask
• redis: A database where votes are stored
• worker: A service that retrieves votes from Redis and stores the results in a Postgres database
• db: The Postgres database where vote results are stored
• result: A backend that sends the scores to a user interface via websocket
• result-ui: An Angular frontend that displays the voting results

The container images for each microservice are available in the DockerHub. The images’ tag follow a Semantic Version (vX.Y.Z).

This application can be deployed on an existing cluster as follows:

kubectl apply -f https://luc.run/vote.yaml

All the Voting App components are created in the namespace vote. Frontend components are exposed through NodePort Services on the following ports:

If an Ingress controller is running:

• the vote interface can be accessed on vote.votingapp.com
• the result interface can be accessed on result.votingapp.com

Feel free to explore the application code