Example Voting App
A simple distributed application running across multiple Docker containers.
The Linux stack uses Python, Node.js, .NET Core (or optionally Java), with Redis for messaging and Postgres for storage.
Run in this directory:
Alternately, if you want to run it on a Docker Swarm, first make sure you have a swarm. If you don't, run:
docker swarm init
Once you have your swarm, in this directory run:
docker stack deploy --compose-file docker-stack.yml vote
You can build from source using:
docker-compose -f docker-compose-windows.yml build
Then run the app using:
docker-compose -f docker-compose-windows.yml up -d
Or in a Windows swarm, run
docker stack deploy -c docker-stack-windows.yml vote
Run the app in Kubernetes
The folder k8s-specifications contains the yaml specifications of the Voting App's services.
First create the vote namespace
$ kubectl create namespace vote
Run the following command to create the deployments and services objects:
$ kubectl create -f k8s-specifications/ deployment "db" created service "db" created deployment "redis" created service "redis" created deployment "result" created service "result" created deployment "vote" created service "vote" created deployment "worker" created
The vote interface is then available on port 31000 on each host of the cluster, the result one is available on port 31001.
- A front-end web app in Python or ASP.NET Core which lets you vote between two options
- A Redis or NATS queue which collects new votes
- A .NET Core, Java or .NET Core 2.1 worker which consumes votes and stores them in…
- A Postgres or TiDB database backed by a Docker volume
- A Node.js or ASP.NET Core SignalR webapp which shows the results of the voting in real time
The voting application only accepts one vote per client. It does not register votes if a vote has already been submitted from a client.