MonoEstimated reading time: 5 minutes
Mono is an open source implementation of Microsoft’s .NET Framework
GitHub repo: https://github.com/mono/docker
Supported tags and respective
For detailed information about the published artifacts of each of the above supported tags (image metadata, transfer size, etc), please see the
repos/mono directory in the
docker-library/repo-info GitHub repo.
For more information about this image and its history, please see the relevant manifest file (
library/mono). This image is updated via pull requests to the
docker-library/official-images GitHub repo.
What is Mono
Sponsored by Xamarin, Mono is an open source implementation of Microsoft’s .NET Framework based on the ECMA standards for C# and the Common Language Runtime. A growing family of solutions and an active and enthusiastic contributing community is helping position Mono to become the leading choice for development of cross platform applications.
How to use this image
This image will run stand-alone Mono console apps.
Dockerfile in your Mono app project
This example Dockerfile will run an executable called
FROM mono:3.10-onbuild CMD [ "mono", "./TestingConsoleApp.exe" ]
Place this file in the root of your app, next to the
.sln solution file. Modify the exectuable name to match what you want to run.
This image includes
ONBUILD triggers that adds your app source code to
/usr/src/app/source, restores NuGet packages and compiles the app, placing the output in
With the Dockerfile in place, you can build and run a Docker image with your app:
$ docker build -t my-app . $ docker run my-app
You should see any output from your app now.
This Docker image is provided by Xamarin, for users of the Mono Project.
Thanks to Michael Friis for his preliminary work.
mono images come in many flavors, each designed for a specific use case.
This is the defacto image. If you are unsure about what your needs are, you probably want to use this one. It is designed to be used both as a throw away container (mount your source code and start the container to start your app), as well as the base to build other images off of.
This image makes building derivative images easier. For most use cases, creating a
Dockerfile in the base of your project directory with the line
FROM mono:onbuild will be enough to create a stand-alone image for your project.
onbuild variant is really useful for “getting off the ground running” (zero to Dockerized in a short period of time), it’s not recommended for long-term usage within a project due to the lack of control over when the
ONBUILD triggers fire (see also
Once you’ve got a handle on how your project functions within Docker, you’ll probably want to adjust your
Dockerfile to inherit from a non-
onbuild variant and copy the commands from the
Dockerfile (moving the
ONBUILD lines to the end and removing the
ONBUILD keywords) into your own file so that you have tighter control over them and more transparency for yourself and others looking at your
Dockerfile as to what it does. This also makes it easier to add additional requirements as time goes on (such as installing more packages before performing the previously-
This Docker Image is licensed with the Expat License. See the Mono Project licensing FAQ for details on how Mono and associated libraries are licensed.
Supported Docker versions
This image is officially supported on Docker version 17.04.0-ce.
Support for older versions (down to 1.6) is provided on a best-effort basis.
Please see the Docker installation documentation for details on how to upgrade your Docker daemon.
Please report issues on the GitHub project.library, sample, Mono