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Our last example will add the Euler Shiny app to the set of applications administered by ShinyProxy. I will be copying this repo and creating a new one where I change the configuration for the 3 applications instead of 2.

The changes I have to make are two: (1) add the new app to application.yml located in the folder shinyproxy-container; (2) and then build a new image that takes these changes. I will not reuse the same image names; I will be creating new ones so the example is very clear.

From the top (the first example), I copy+paste the section for the Euler app and inserted at the end of application.yml:

- id: euler
      display-name: Euler's number
      container-cmd: ["R", "-e", "shiny::runApp('/root/euler')"]
      container-image: euler-img

And save the modified application.yml:

proxy:
  port: 8080
  authentication: simple
  admin-groups: admins
  users:
  - name: jack
    password: password
    groups: admins
  - name: jeff
    password: password
  docker:
      internal-networking: true
  specs:
  - id: 07_widgets
    display-name: Widgets Application
    description: Application which demonstrates the basics of a Shiny app
    container-cmd: ["R", "-e", "shinyapps::run_07_widgets()"]
    container-image: shinyapps-img
    container-network: sp-example-net
  - id: 04_mpg
    display-name: MPG Application
    container-cmd: ["R", "-e", "shinyapps::run_04_mpg()"]
    container-image: shinyapps-img
    container-network: sp-example-net
  - id: euler
    display-name: Euler's number
    container-cmd: ["R", "-e", "shiny::runApp('/root/euler')"]
    container-image: euler-img
    container-network: sp-example-netlogging:
  file:
    shinyproxy.log

You see only a minor change: we added the container network sp-example-net for the Euler app. All the containers must belong to the same network.

Let’s build the new image for the three applications from the folder shinyproxy-container with:

docker build -t shinyproxy3-img .

And launch the new container:

docker run --rm \
    -v /var/run/docker.sock:/var/run/docker.sock \
    --net sp-example-net \
    -p 8080:8080 \
    shinyproxy3-img

Note that we are now adding two new parameters: -v /var/run/docker.sock:/var/run/docker.sock to create a volume, and --net sp-example-net to connect to a shared network..

Open the browser at 127.0.0.1:8080

There are three applications now. It will take few seconds to start the container and launch the Shiny app from the third container:

Finally, our third application powered by the third container:

And we launch the “MPG App”. In csysdig we see now the three containers that were spun off from the images euler-img, shinyapps-img, and shinyproxy3-img.