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Adding more Shiny apps as containers. Example 3

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.

Add the new Shiny app to ShinyProxy configuration

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

Attach the new Shiny app to the shared network

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.

Rebuild the ShinyProxy Docker image

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

docker build -t shinyproxy3-img .

Run the new container

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.

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