visual studio docker debug

The IDE will add a debug configuration to .vscode/launch.json to launch the application in a container. Debug .NET applications running in local containers with VS Code, Three ways to containerize .NET applications on Red Hat OpenShift, Set up continuous integration for .NET Core with OpenShift Pipelines, Debug .NET applications running on Kubernetes with VS Code, Containerize .NET applications without writing Dockerfiles, How to configure Helm charts using JKube, part 2, Red Hat Developer roundup: Best of July 2022, SaaS security in Kubernetes environments: A layered approach. The .vscode/tasks.json file contains a few tasks that are used in this process: The docker-build step uses the Dockerfile that was added to the workspace. With all the pieces matching, it was time to prove that everything is working the way I think it is. Next, launch VS Code and install the C# extension and Docker extension. However, what interests us most, regarding our investigation, is the docker exec command. But we still dont know how Visual Studio communicates with the debugger running in the interactive session. You can also do a Debug file deployment from Visual Studio into the running container. From the top Debug menu, click Attach to Process to open the Attach to Process dialog. For Connection target, click Find. The WinDbg output for the first frame looked as follows: And the first frame already revealed the place where Visual Studio keeps the debugger assemblies. That explains the interactive docker session! (LogOut/ The application will launch in the container with the debugger attached. The materials on this site are licensed under a Creative Commons Attribution 4.0 International License. Open, hybrid-cloud Kubernetes platform to build, run, and scale container-based applications -- now with developer tools, CI/CD, and release management. This topic shows how debug code that is running in a container. It saves a lot of time if you can debug in similar ways on your local system and in the cloud, running your application in a container in both cases. To make this all work, Visual Studio requires a Dockerfile in the root project folder. How Visual Studio debugs containerizedapps, the doc describing how Visual Studio builds containerized apps, .NET R&D Digest (December, 2020) Oleg Karasik's blog, Creative Commons Attribution 4.0 International License. It all looks like magic, but as usual, there are protocols and lines of code that run this machinery behind the magical facade. You can add a breakpoint and hit it in the debugger (Figure 3). VS Code is designed for .NET and is extremely valuable for developing and debugging .NET applications. Finally, I decided to write my own sniffer and replace the docker.exe process with it. These are enterprise-grade images that can be freely distributed and deployed anywhere. The value 1000 needs to match your user ID (UID). The VS Code Docker extension doesn't detect Podman automatically, though. The problem solvers who create careers with code. I'm using Podman, which comes pre-installed on Fedora. For Connection type, click Docker (Windows Container). Though not unique to containers, you must ensure that debug symbols have been deployed to the container. Local Sitecore development with containers. The image for our debug session needs to provide .NET runtime dependencies. And whats even better, we can debug it! In the process tree (Ctrl + T), it was evident that Visual Studio uses the docker.exe client to interact with the Docker containers. The base image defined in this file is used for debugging. Click Other Windows, then Containers. After a few trials (it seems that Console.StandardInput.ReadAsync is a blocking call), I ended up with the following code: As you can see, for each docker.exe launch, Im creating four files: Then, I build a single assembly of my sniffer (thanks .NET 5.0! Once you hit Ctrl+C, the regular development server (with autoreload) will relaunch. For example, the custom-images example in the Docker Examples repository uses a BUILD_CONFIGURATION environment variable that sets this to Debug by default. The Command Palette in VS Code, with the proper extensions, lets you add Docker or Podman files. A previous article showed how to debug a .NET application that is running on Kubernetes from Visual Studio Code(VS Code) on your local development machine. We serve the builders. The rest of this section shows how you can configure the use of Podman. Take a look at the UBI FAQ or read the e-book Red Hat Universal Base Images (UBI)to learn more. But moving back to our trace, we can see that we have a running ASP.NET Core app container, and there is an interactive debugging session attached to it. (LogOut/ If you are using the Red Hat image for an earlier .NET version than 6.0, you need to add the following additional line: You can now launch your application In VS Code's Run and Debug tab. And in this post, we will take a sneak peek at them . The first setting tells the extension to use the podman executable instead of docker. Change), You are commenting using your Twitter account. It creates an interactive debugger session in the Docker container. I created a filter for the Operation and Path as on the image below: With these filters in place, I was able to pick the events emitted when a parent process (in our case, Visual Studio and MSBuild) created each of the docker.exe instances: And I had not only command-line arguments but also the call stacks! In the list of running containers, right-click on the one that you want to debug, and click Attach to Process: The Attach to Process dialog appears and shows the available processes running in the container: For Attach to Process, you check that the correct code type is selected. It is an excellent read which explains, among many other things, how the debugger binaries land in the docker container and what differences are between Debug and Release builds. In Visual Studio 2019, when we work on the ASP.NET Core project, it is possible to create a launch profile that points to a Docker container, for example: And thats fantastic as we can launch the container directly from Visual Studio. Finally, answer No when asked to add the optional Docker Compose file. If you plan to deploy your application on Kubernetes, the application will run in a container. Open your application folder in VS Code. But before we dive in, I need to mention the doc describing how Visual Studio builds containerized apps. Running containers appear in the list. Recently, I was looking into the internals of the Visual Studio debugger for the .NET Diagnostics Expert course. Below, you may find two first messages from the .in and .out files arranged in the correct order: Fill in your details below or click an icon to log in: You are commenting using your WordPress.com account. Choose the Docker .NET Core Launch option (Figure 2). First, enable the podman.socket service, which provides a Docker-compatible API: In VS Code, open the Command Palette by pressing Ctrl+Shift+P and choose Preferences: Open Settings (JSON). Then I experimented with breakpoints in WinDbg, but it proved to be hard to find the right handle and then extract the exchanged bytes. Red Hat provides Universal Base Images (UBI) for .NET. Figure 3. The other setting provides the path to the API socket. As the application platform, choose .NET ASP.NET Core. For those of you who havent tried it yet, let me provide a concise description. Lets first have a look at the command lines: We can see that MSBuild disposes the previous container during the build and then creates a new one (docker run). Once the debugger launched, I stopped the trace and started the analysis. As the docker exec event came from Visual Studio, it could be the debugger engine that fired the command. The Red Hat build of OpenJDK is a free and supportable open source implementation of the Java Platform, Standard Edition (Java SE). If you are using Docker, you can skip to the next section. Quite soon, I discovered that the Visual Studio engine communicates with the container debugger using the Debug Adapter Protocol. So, I copied the call stack from the properties window for this event and looked at the frames (I stripped the unimportant ones): Unfortunately, Process Monitor does not understand managed stacks (displays them as ), but, on the bright side, that also means that Visual Studio debugger is a .NET application. When prompted to select an operating system, pick your host OS (Windows/Linux). Figure 2. Debugging the application in a local container can let you see its behavior in a local environment that is fairly close to the production environment. For debugging a CM or CD w3wp.exe file, this is Managed Code (v4.6, v4.5, v4.0). Thus, I decided I need to have a more in-depth look at the Visual Studio debugger engine. If youve followed Docker Based Developer Installation Guide, your Redash server is running inside a Docker container and cannot be debugged directly. Learn how this powerful open-source tool helps you manage components across containers in any environment. Select the process (for example, w3wp.exe) as usual (check Show processes from all users if not visible), and click Attach. Change), You are commenting using your Facebook account. Change the configuration to use a UBI image by replacing all the lines starting with the FROM as build line with the following: If you're not using .NET 6.0, you need to update the FROM image so it provides the right version. Change). Develop applications on the most popular Linux for the enterpriseall while using the latest technologies. To debug apps in a local Docker container, you need the following: Visual Studio 2019 version 16.5.0 or later. And one of the sessions was the debugger one! Kubernetes-native Java with low memory footprint and fast boot times for microservices and serverless applications. A stable, proven foundation that's versatile enough for rolling out new applications, virtualizing environments, and creating a secure hybrid cloud. If you don't have an application, you can create one as follows: Now open the Command Palette by pressing Ctrl+Shift+P and choose Docker: Add Docker Files to Workspace. (Figure 1). If you wish to debug server code, you will need to use remote debugging. The default Dockerfile (which you can create in the ASP.NET Core application wizard) looks as follows: And thats it. Follow the preparation steps or run the included init.ps1 script to perform these preparation steps automatically. At first, I started looking for some hidden named pipes and WSL API, but couldnt find anything. I was especially interested in how the Docker debugging works. The Run and Debug tab in VS Code lets you run your application. And interestingly, the communication happens over the process standard input/output. Alternatively, you can also use the Debug menu, although this involves a few more steps than the Containers window. (LogOut/ This might already be done if you are building your solution image with the Debug build configuration. You can use the custom-images solution from the Docker Examples repository if you do not have your own. Figure 1. As a side note, notice that the debugger binaries were copied to my home folder (C:\Users\me\vsdbg) it could be interesting to investigate how they landed there . Select the container you want to debug and click OK. For Attach to, ensure the correct code type is selected. Sorry, you need to enable JavaScript to visit this website. In Visual Studio, you have two options for attaching to a process in a container: If the Containers window is not showing, open it from the top View menu. When I dont know how things work, I use Process Monitor. Docker Based Developer Installation Guide, Switch over to Visual Studio Code and select View -> Debug, Select the Python: Remote Attach configuration. The VS Code debugger has stopped the application at a breakpoint. This topic explains how you use Visual Studio to diagnose your code when it is running in a local Docker container. At first, I started looking for some sniffers of the process input/output but couldnt find any (let me know if you know such tools). ): And copied it to c:\ProgramData\DockerDesktop\version-bin. I suggest specifying. DevOps involves the combination of cultural change, process automation, and tools to improve your time-to-market. In this case, I started the Process Monitor trace, moved back to Visual Studio, and pressed F5. It was time to fire up ILSpy and indulge myself in some reversing . document.getElementById( "ak_js_1" ).setAttribute( "value", ( new Date() ).getTime() ); This site uses Akismet to reduce spam. Even when you don't intend to deploy your application using containers, running it in a container can be a way to reproduce a bug that is reported to occur only in a specific environment, such as a specific Linux distribution. You can build an image yourself or base it on images provided by Microsoft (through runtime images or SDK images) or Red Hat (through runtime images or SDK images). This guide assumes you are able to build and run custom Sitecore runtime images that include your solution's build output. Join us if youre a developer, software engineer, web designer, front-end designer, UX designer, computer scientist, architect, tester, product manager, project manager or team lead. In this tutorial, you'll debug an application that is running in a container right on your development machine. Learn how your comment data is processed. Then I renamed the docker.exe shortcut in this folder to docker.bak.exe and my sniffer to docker.exe. . You can see your UID by running id -u. Code reloading is not supported during a debugging session, so if youd like to make changes, hit Ctrl+C in the terminal and restart from step 1. This approach helps you achieve that flexibility. For debugging a CM or CD w3wp.exe, this will be Managed Code (v4.6, v4.5, v4.0). If we press F5, we land inside an application container, and we can step through our applications code. If you haven't already, install Visual Studio Code using the instructions on the project's website. Nevertheless, I needed to create a memory dump of the Visual Studio process and manually decode the managed frames. You also need to install a container engine such as Docker or Podman. I launched Visual Studio debugger, and soon in the d:\temp\docker-proxy folder, logs from multiple docker sessions started appearing. This post will focus only on the debugger bits, so please read the doc to have the full picture. Next, specify a comma-separated list of ports to expose.

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