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# Vote App | ||
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A simple distributed application running across multiple Docker containers. | ||
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## Getting started | ||
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Download [Docker Desktop](https://www.docker.com/products/docker-desktop) for Mac or Windows. [Docker Compose](https://docs.docker.com/compose) will be automatically installed. On Linux, make sure you have the latest version of [Compose](https://docs.docker.com/compose/install/). | ||
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This solution uses Python, Node.js, .NET, with Redis for messaging and Postgres for storage. | ||
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Run in this directory to build and run the app: | ||
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```shell | ||
docker compose up | ||
``` | ||
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The `vote` app will be running at [http://localhost:5000](http://localhost:5000), and the `results` will be at [http://localhost:5001](http://localhost:5001). | ||
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Alternately, if you want to run it on a [Docker Swarm](https://docs.docker.com/engine/swarm/), first make sure you have a swarm. If you don't, run: | ||
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```shell | ||
docker swarm init | ||
``` | ||
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Once you have your swarm, in this directory run: | ||
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```shell | ||
docker stack deploy --compose-file docker-stack.yml vote | ||
``` | ||
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## Run the app in Kubernetes | ||
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The folder k8s-specifications contains the YAML specifications of the Voting App's services. | ||
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Run the following command to create the deployments and services. Note it will create these resources in your current namespace (`default` if you haven't changed it.) | ||
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```shell | ||
kubectl create -f k8s-specifications/ | ||
``` | ||
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The `vote` web app is then available on port 31000 on each host of the cluster, the `result` web app is available on port 31001. | ||
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To remove them, run: | ||
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```shell | ||
kubectl delete -f k8s-specifications/ | ||
``` | ||
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## Architecture | ||
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![Architecture diagram](architecture.excalidraw.png) | ||
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* A front-end web app in [Python](/vote) which lets you vote between two options | ||
* A [Redis](https://hub.docker.com/_/redis/) which collects new votes | ||
* A [.NET](/worker/) worker which consumes votes and stores them in… | ||
* A [Postgres](https://hub.docker.com/_/postgres/) database backed by a Docker volume | ||
* A [Node.js](/result) web app which shows the results of the voting in real time | ||
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## Notes | ||
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The voting application only accepts one vote per client browser. It does not register additional votes if a vote has already been submitted from a client. | ||
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This isn't an example of a properly architected perfectly designed distributed app... it's just a simple | ||
example of the various types of pieces and languages you might see (queues, persistent data, etc), and how to | ||
deal with them in Docker at a basic level. |