Should Docker Run -net=host Work?

09.11.2019

Docker containers are run from images. Basically an image is an isolated operating system with a pre-installed set of libraries/frameworks defined in a Dockerfile or inherited from another image.

If you've got Docker installed you can run a.NET Core sample quickly just like this. Try it: docker run -rm microsoft/dotnet-samples If your Docker for Windows is in ' you can try.NET Framework (the 4.x Windows Framework) like this: docker run -rm microsoft/dotnet-framework-samples I did a. Container images are easy to share via, the, and private Docker registries, such as the. Also check out. It all works very nicely together. I like this: Imagine five or so years ago someone telling you in a job interview that they care so much about consistency that they always ship the operating system with their app. You probably wouldn’t have hired them.

Run

Yet, that’s exactly the model Docker uses! And it's a good model! It gives you guaranteed consistency. 'Containers include the application and all of its dependencies.

The application executes the same code, regardless of computer, environment or cloud.' It's also a good way to make sure your underlying.NET is up to date with security fixes: Docker is a game changer for acquiring and using.NET updates. Think back to just a few years ago. You would download the latest.NET Framework as an MSI installer package on Windows and not need to download it again until we shipped the next version. Fast forward to today. We push updated container images to multiple times a month.

The.NET images get built using the official Docker images which is nice.NET images are built using. We build on top of, and official images for x64 and ARM. By using official images, we leave the cost and complexity of regularly updating operating system base images and packages like OpenSSL, for example, to the developers that are closest to those technologies. Instead, our build system is configured to automatically build, test and push.NET images whenever the official images that we use are updated. Using that approach, we’re able to offer.NET Core on multiple Linux distros at low cost and release updates to you within hours.

Here's where you can find.NET Docker Hub repos:.NET Core repos:. – includes.NET Core runtime, sdk, and ASP.NET Core images.

– includes ASP.NET Core runtime images for.NET Core 2.0 and earlier versions. Use for.NET Core 2.1 and later. – Includes ASP.NET Core SDK and node.js for.NET Core 2.0 and earlier versions. Use for.NET Core 2.1 and later. See.NET Framework repos:. – includes.NET Framework runtime and sdk images. – includes ASP.NET runtime images, for ASP.NET Web Forms and MVC, configured for IIS.

Docker Run Bash

– includes WCF runtime images configured for IIS. – includes IIS on top of the Windows Server Core base image. Works for but not optimized for.NET Framework applications. The and repos are recommended instead for running the respective application types. There's a few kinds of images in the repo:.

sdk —.NET Core SDK images, which include the.NET Core CLI, the.NET Core runtime and ASP.NET Core. aspnetcore-runtime — ASP.NET Core images, which include the.NET Core runtime and ASP.NET Core. runtime —.NET Core runtime images, which include the.NET Core runtime. runtime-deps —.NET Core runtime dependency images, which include only the dependencies of.NET Core and not.NET Core itself.

This image is intended for and is only offered for Linux. For Windows, you can use the operating system base image directly for self-contained applications, since all.NET Core dependencies are satisfied by it. For example, I'll use an SDK image to build my app, but I'll use aspnetcore-runtime to ship it.

No need to ship the SDK with a running app. For me, I even made a little PowerShell script (runs on Windows or Linux) that builds and tests my (the image tagged podcast:test) within docker. Note the volume mapping? It stores the Test Results outside the container so I can look at them later if I need to. #!/usr/local/bin/powershell docker build -pull -target testrunner -t podcast:test.

Docker run -rm -v c: github hanselminutes-core TestResults:/app/hanselminutes.core.tests/TestResults podcast:test Pretty slick. Results File: /app/hanselminutes.core.tests/TestResults/898a406a7ad12018-06-28220504.trx Total tests: 22. Test execution time: 8.9496 Seconds Go read up on.

It made it easy for me to get. Never type an invoice again! With, you’ll extract data from bills, invoices, PO’s & other documents using zonal data capture technology.!

I like your post. I get why you are saying it, but I think you are oversimplifying when you mention this: Imagine five or so years ago someone telling you in a job interview that they care so much about consistency that they always ship the operating system with their app.

You probably wouldn’t have hired them. Yet, that’s exactly the model Docker uses! The goal with the container is to provide the tightest isolation of your code and the most minimal container that will still run your code. If we look at linux native containers, they tend to be much smaller than the windows containers because of how the windows vs linux containers work - we aren't shipping the whole operating system, just the bits that are required for the application to run. The rest of the OS/Kernel is left for the base machine to deal with.

I do think you allude to that with a later comment though: For example, I'll use an SDK image to build my app, but I'll use aspnetcore-runtime to ship it. No need to ship the SDK with a running app. I want to keep my image sizes as small as possible!but wanted to make sure that for those who are learning about containerization, that we are being explicit so that they do follow best practices instead of starting every container with 'FROM '. Great article as always, however there are major problems with Docker and VS.net specifically that need to be addressed: 1. Running your tests in a different container build separately isn't really running your tests. It defeats the entire purpose of Docker because you could inadvertently have different environment variables or build-args etc. The tests should run with exactly the same commands that built the actual code.

AND Unit Tests should always be done as part of BUILD, not a run command because with RUN you're decoupling settings which is a problem. Azure App Service Container hosting isn't passing Application Settings properly as environment variables (I know you didn't cover this) despite the documentation saying otherwise. #2 is just a bug hopefully that can be fixed. I've submitted an urgent Azure support ticket with 2 hour turn around that is now into day 3 without a phone call but here's hoping. #1 is more severe and it's a product of issues with both Docker and VS.net What should happen in VS.net is that all tests on a dockerized site should be run through the docker image. But this can't really happen because of the structure of the docker image in that it dumps the.sdk build version for just the runtime at the end that can't run tests (as far as I can tell). What really needs to happen is: On a development machine, VS.net needs to tell docker to keep both containers and run all tests on the sdk container whenever the developer requests them.

Docker Run Image

(and not run them automatically on build/debug) On VSTS an build-arg should be able to be passed so that after build, and before publish all unit tests are run. The problem with this (I've hacked this to work sort of) is that because you don't get back the container Id, you can't run docker cp to copy the test results out of the container AND there is no DOCKERFILE command to accomplish this. Docker should be updated to have a COPYOUT method that can copy out the results to the host which would be the most elegant solution. Worst case, VSTS should be updated to capture the container Id as an output variable so that you can then hack in a docker cp call. (there is now a reopened bug on this, so hopefully it will get done soon) This should all be automatic. I shouldn't have to hack VS.net to make this work (which as far as I'm aware is impossible to do from the UI) and I shouldn't have to hack VSTS either, it should just work. (PS your comment editor is seriously messed up in Edge.

Trying to use ol/ul results in blank outs of text, the text doesn't wrap etc.).

Docker version 1.11.0, build Environment: Cloud9 IDE (c9.io) Installation process / 'docker run hello-world' ultimately fails (as does 'sudo docker daemon'), apparently due to the fact that Cloud9 itself is running within a Docker container: When running inside a Docker container, docker should not be able to allocate arbitrary resources, but should at least be able to further subdivide the resources allocated to the container in which it is running. (And it should be possible to do this securely). Can it do this by IPC communication with the containing daemon instead of having these privileges directly, however? That would at least ensure that other programs in the container don't arbitrarily have these privileges (with the outer daemon being able to validate calls from inside the container).

On Tue, Apr 19, 2016, 08:13 Brian Goff wrote: It's not just about subdividing resources. Docker needs to be able to mount things (CAPSYSADMIN), configure network interfaces (CAPNETADMIN) and a slew of other things. The only thing -privileged does is make sure Docker doesn't drop caps/filter syscalls/apply apparmor templates, etc. — You are receiving this because you authored the thread. Reply to this email directly or view it on GitHub.

Comments are closed.