/kubernetes_shiny_example

Shiny App on Kubernetes Example

Example R Shiny app that has been dockerized and is run using Kubernetes. Useful for deployment of R Shiny apps on Kubernetes.

File uses dockerized shiny app that can be found here:

Getting Kubernetees to run on WSL

  • install docker desktop for windows with WSL enabled
  • install minikube for windows
  • start docker desktop
  • in PowerShell in Admin mode:
    • set default driver for minikube to docker using minikube config set driver docker
    • run minikube start
  • copy %USERPROFILE%.kube\config from Windows to ~/.kube/config but change directory structure to WSL to point to Windows files. You may need to do this everytime you start up docker to update the IP:port.

To get docker image from docker hub for kubernetes cluster

image: bbcho/docker_shiny_example:0.2.0 # tag is required

Running the App

in WSL:

kubectl create -f deployment.yaml
kubectl create -f loadbalancer.yaml

Then in PowerShell

minikube service shiny-loadbalancer

References

To get Kubernetes to pull from local docker registry

https://medium.com/swlh/how-to-run-locally-built-docker-images-in-kubernetes-b28fbc32cc1d

Getting Node IP Address

kubectl get nodes -o yaml

Connecting to Node

Use either the internal IP that you get from the kubectl get nodes -o yaml command or the url from minikube service shiny-loadbalancer --url via powershell.