Example Voting App

Credit: this repo is forked from https://github.com/dockersamples/example-voting-app, modified to run on Azure App Servcie with Multi-container support.

Getting started

Download Docker. If you are on Mac or Windows, Docker Compose will be automatically installed. On Linux, make sure you have the latest version of Compose. If you're using Docker for Windows on Windows 10 pro or later, you must also switch to Linux containers.

Run in this directory:

docker-compose up

The app will be running at http://localhost:80, and the results will be at http://localhost/result.

Run the app in Azure App Service

Make sure you have the latest Azure CLI installed. Follow the steps in this [tutorial]https://docs.microsoft.com/en-us/azure/app-service/containers/tutorial-custom-docker-image) to create Azure Resource Group and Linux App Service plan, please ignore the stpes for downloading the sample repo. We should be able to provide a tutorial specifically for Multi-container Web App, stay tunned.

Once you have a Linux App Service plan, you can run the following CLI to create a Web App for this voting sample: $ az webapp create --resource-group [resource group] --plan [service plan] --name [app name] --multicontainer-config-type "compose" --multicontainer-config-file "docker-compose-appservice.yml"

Wait for about a minute, you can then access the voting app at: https://appname.azurewebsites.net/, and the the results will be at https://appname.azurewebsites.net/result. Enjoy!

Rune the app in Docker Swarm

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

Run the app in Kubernetes

The folder k8s-specifications contains the yaml specifications of the Voting App's services.

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 Nginx proxy which handles the inbound requests for voting and result pages
A Python webapp which lets you vote between two options
A Redis queue which collects new votes
A .NET worker which consumes votes and stores them in…
A Postgres database backed by a Docker volume
A Node.js webapp which shows the results of the voting in real time

Note

iThe voting application only accepts one vote per client. It does not register votes if a vote has already been submitted from a client. Voter can change the vote at any time and result will be reflected on results page.

License

20shivangi/example-voting-app

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