Use Visual Studio debugger with ASP.NET Core web app running in Kubernetes?

Use Visual Studio debugger with ASP.NET Core web app running in Kubernetes?

To use the Visual Studio debugger with an ASP.NET Core web app running in Kubernetes, you can use remote debugging. Here are the steps to follow:

  • Deploy your ASP.NET Core app to Kubernetes: Before you can start debugging, you need to deploy your ASP.NET Core web app to Kubernetes. You can do this using your preferred deployment method, such as Helm charts, YAML files, or Kubernetes Deployment Manager.

  • Configure your ASP.NET Core app to enable remote debugging: To enable remote debugging, you need to add the following configuration to your ASP.NET Core app's launchSettings.json file:

{ "profiles": { "Kubernetes": { "commandName": "Project", "launchBrowser": false, "environmentVariables": { "ASPNETCORE_ENVIRONMENT": "Development", "DOTNET_USE_POLLING_FILE_WATCHER": "true", "ASPNETCORE_URLS": "http://+:80", "Hosting:ServerUrls": "http://0.0.0.0:80" }, "dotnetRunMessages": "true", "applicationUrl": "http://localhost:5000" } } }

In the above configuration, we have added environment variables for ASP.NET Core app, which enable polling-based file watcher, set the URL for the app to listen on, and specify the server URL.

  • Expose the remote debugging port: By default, remote debugging uses port 4022. You need to expose this port in your Kubernetes deployment configuration file.
apiVersion: apps/v1 kind: Deployment metadata: name: my-app spec: replicas: 1 selector: matchLabels: app: my-app template: metadata: labels: app: my-app spec: containers: - name: my-app image: my-app-image ports: - containerPort: 80 protocol: TCP - containerPort: 4022 protocol: TCP env: - name: ASPNETCORE_ENVIRONMENT value: "Development" - name: ASPNETCORE_URLS value: "http://+:80" volumeMounts: - name: my-app-data mountPath: /app/data volumes: - name: my-app-data persistentVolumeClaim: claimName: my-app-pvc imagePullSecrets: - name: my-registry-credentials
  • Attach the Visual Studio debugger: Once your ASP.NET Core app is deployed and the remote debugging port is exposed, you can attach the Visual Studio debugger to the app. To do this, open Visual Studio and go to Debug -> Attach to Process. In the Attach to Process window, select the "Qualify remote (Kubernetes, Docker, SSH)" transport, and enter the IP address and port of the Kubernetes cluster. Then, select your ASP.NET Core app from the list of available processes and click "Attach".

You should now be able to debug your ASP.NET Core app running in Kubernetes using the Visual Studio debugger.

Examples

  1. "Configure Visual Studio launchSettings.json for Kubernetes debugging"

    • Description: Explore how to configure the launchSettings.json file in Visual Studio for debugging ASP.NET Core apps in Kubernetes.
    // Code: Update launchSettings.json with Kubernetes debug configuration { "profiles": { "Kubernetes": { "commandName": "Project", "launchBrowser": true, "launchUrl": "swagger", "environmentVariables": { "ASPNETCORE_ENVIRONMENT": "Development", "ASPNETCORE_URLS": "http://*:5000" } } } }

  2. "Visual Studio Dockerfile configuration for Kubernetes debugging"

    • Description: Configure the Dockerfile in Visual Studio for building container images suitable for debugging in a Kubernetes environment.
    # Code: Update Dockerfile with debugging configurations FROM mcr.microsoft.com/dotnet/core/aspnet:3.1-buster-slim AS base WORKDIR /app EXPOSE 80 FROM mcr.microsoft.com/dotnet/core/sdk:3.1-buster AS build WORKDIR /src # Rest of the Dockerfile...

  3. "Debugging Kubernetes secrets and configurations in Visual Studio"

    • Description: Learn how to debug ASP.NET Core apps in Kubernetes that rely on secrets and configurations using Visual Studio.
    // Code: Handle secrets and configurations in ASP.NET Core app code var secretValue = Configuration["MySecretKey"];

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