Welcome to Docker’s .NET Conf challenge!
This lab gets you using .NET Core in Docker containers. You’ll experience compiling code, packaging apps and running containers, using the latest .NET Core 3.0 release.
Difficulty: Beginner (assumes no familiarity with Docker)
Time: Approximately 5 minutes
The Play-with-Docker environment is already set up with Docker and Git, so you’re good to go.
Clone the source code from GitHub
Clone the application source into your local session:
Just click the text in these boxes to send the command to your terminal
git clone https://github.com/dockersamples/dotnetconf19.git
Now browse to the source code folder
In there you’ll see a folder called
src which contains the .NET code and a file called
Dockerfile whch contains the instructions to build and package the app:
dotnet commands to restore NuGet packages and publish the app:
Even if you’re not familiar with the Dockerfile syntax, you can kind of work out that this is a script to compile the app and package it up to run
You run the script with the
docker image build command, which produces a container package called a Docker image:
docker image build --tag dotnetconf:19 .
You’ll see lots of download progress bars, and some familiar output from MSBuild.
The final message
Successfully tagged dotnetconf:19 tells you the image has been built and given the tag
dotnetconf:19 - which is just the image name.
A Docker image is a complete packaged app. You can share it on Docker Hub, which is how thousands of open-source and commercial projects now distribute their software.
Your image contains the .NET Core 3.0 runtime, together with the assemblies and configuration for the demo app.
You run the app by running a container from the image:
docker container run dotnetconf:19
Scroll up to read the message from .NET Bot - that’s your .NET Conf code!
If you want to learn more about what’s happened here and how you can use Docker to build cross-platform apps that run on Windows, Linux, Itenal and Arm - check out this blog post:
Enjoy .NET Conf :)
The Play with Docker Training site is always on, and there are plenty more labs you can try at home.