https://github.com/tarathep/voting-stack
A simple distributed application running across multiple Docker containers.
https://github.com/tarathep/voting-stack
docker docker-compose kubernetes redis
Last synced: 3 months ago
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A simple distributed application running across multiple Docker containers.
- Host: GitHub
- URL: https://github.com/tarathep/voting-stack
- Owner: tarathep
- License: mit
- Created: 2022-01-02T06:18:20.000Z (over 4 years ago)
- Default Branch: main
- Last Pushed: 2022-01-04T02:11:19.000Z (over 4 years ago)
- Last Synced: 2025-01-17T11:33:33.525Z (over 1 year ago)
- Topics: docker, docker-compose, kubernetes, redis
- Language: JavaScript
- Homepage:
- Size: 154 KB
- Stars: 0
- Watchers: 2
- Forks: 0
- Open Issues: 0
-
Metadata Files:
- Readme: README.md
- License: LICENSE
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README
Example Voting App
=========
A simple distributed application running across multiple Docker containers.
Getting started
---------------
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/).
## Linux Containers
The Linux stack uses Python, Node.js, Java, with Redis for messaging and Postgres for storage.
> If you're using [Docker Desktop on Windows](https://store.docker.com/editions/community/docker-ce-desktop-windows), you can run the Linux version by [switching to Linux containers](https://docs.docker.com/docker-for-windows/#switch-between-windows-and-linux-containers), or run the Windows containers version.
Run in this directory:
```
docker-compose up
```
The app will be running at [http://localhost:5000](http://localhost:5000), and the results will be at [http://localhost:5001](http://localhost:5001).
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:
```
docker swarm init
```
Once you have your swarm, in this directory run:
```
docker stack deploy --compose-file docker-stack.yml vote
```
The app will be running at [http://localhost:5000](http://localhost:5000), and the results will be at [http://localhost:5001](http://localhost:5001).
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.
Architecture
-----
* A front-end web app in [Python](/vote) which lets you vote between two options
* A [Redis](https://hub.docker.com/_/redis/) queue which collects new votes
* A [Java](/worker/src/main) 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) webapp which shows the results of the voting in real time
Note
----
The voting application only accepts one vote per client (IP Address). It does not register votes if a vote has already been submitted from a client.