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Single Container Loop Challenge

Why

Containers can make certain aspects of a developer's or admin's life very easy by hiding complexity and by providing reliability. In this chapter you will get a basic experience in working with containers. For this chapter we concentrate on single container applications running locally first and in Azure Container Instances in the second step.

Here's what you'll learn:

  • Container basics
    • Get a feeling for work with containers and understand their purpose
    • Understand what a Dockerfile is
    • How to create a container image
    • How to run a container image locally
    • Get a sense for container networking and ports
    • How to create new versions of images
    • Learn about tagging
    • How to use Azure DevOps automation to set up an automated workflow
  • Deployment
    • How to provide a container image in a registry
    • How to set up a container registry
    • How to run a container in the cloud

1. Containerize your app

  • Get the code of the hello world application (git clone https://github.com/CSA-OCP-GER/phoenix) locally and navigate to the folder (phoenix\apps\aci-helloworld).
  • Create a container image locally (you need docker running on your machine). Don't forget the trailing "." in the following line! 
    docker build -t helloworld .
  • Check if the image has been built. 
    docker images
  • Run the image in a container locally on your machine. Remember to open up the correct port in your command (-p). 
    docker run -d -p 8080:80 helloworld
  • Open the browser and navigate to the application you just started with your browser (http://localhost:8080). If you're running on a Linux VM in Azure, just run this command to avoid working with a graphical browser: 
    wget http://localhost:8080
    Then check the content with: 
    cat index.html
  • Check the running processes
docker ps

CONTAINER ID        IMAGE               COMMAND                  CREATED             STATUS              PORTS                    NAMES
bc4b6b155c2c        helloworld          "/bin/sh -c 'node /u…"   12 seconds ago      Up 9 seconds        0.0.0.0:8080->8080/tcp   peaceful_mccarthy
  • Kill the process to clean up
docker kill <your_container_id>

2. Automate your build

Need help? Check hints here 📘!

  • Import the sample code from to your Azure DevOps Team Project. You can do this via UI.
  • Use Azure DevOps to create a build definition which triggers on code changes. The build definition should
    • create a new container image
    • use the build number as tag to identify your image. The buildId can be found in variable $(Build.BuildId) (The screenshots may show Buildnumber - make sure to use the BuildId)
    • push the new image to your private Azure Container Registry (if you don't have an ACR, create one first)

3. Release to ACI manually

Need help? Check hints here 📘!

  • Run your newly created image in Azure Container Instances to see if everything works. You can start it manually in the portal or via command line.