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Get the sources and deploy the sample app

vagrant@k8s-01:~$ git clone https://github.com/dockersamples/example-voting-app.git
vagrant@k8s-01:~$ cd example-voting-app
vagrant@k8s-01:~$ kubectl create -f k8s-specifications/

The vote interface is then available on port 31000 on each host of the cluster, the result one is available on port 31001.

Architecture

Architecture diagram

  • 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

Display deployment information on the cluster

vagrant@k8s-01:~/example-voting-app$ kubectl get services
NAME         TYPE        CLUSTER-IP      EXTERNAL-IP   PORT(S)          AGE
db           ClusterIP   10.233.35.241   <none>        5432/TCP         11m
kubernetes   ClusterIP   10.233.0.1      <none>        443/TCP          7d
redis        ClusterIP   10.233.57.65    <none>        6379/TCP         11m
result       NodePort    10.233.37.243   <none>        5001:31001/TCP   11m
vote         NodePort    10.233.62.66    <none>        5000:31000/TCP   11

Forwarding ports 31000 and 31001 from the host to the cluster

Update vagrant/config.rb with the following contents.

$forwarded_ports = {8001 => 8001, 31000 => 31000, 31001 => 31001}

Restart the cluster

$ vagrant reload
$ vagrant provision

Allow access to the dashboard

$ vagrant ssh k8s-01
vagrant@k8s-01:~$ kubectl create -f dashboard-admin.yml
clusterrolebinding.rbac.authorization.k8s.io "kubernetes-dashboard" created

Start the proxy

vagrant@k8s-01:~$ kubectl proxy --port=8001 --api-prefix=/ --address='0.0.0.0'

Recreate the sample app

vagrant@k8s-01:~$ cd example-voting-app/
vagrant@k8s-01:~/example-voting-app$ kubectl delete -f k8s-specifications/
vagrant@k8s-01:~/example-voting-app$ kubectl create -f k8s-specifications/