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DockerDotnetDebug

A remotely debuggable docker container, use it as your base runtime in desperate times, when you need to debug somehting remotely and you just can;t do all the tests locally.

Quickstart

  1. docker run -d -p 2222:2222 -p 5000:5000 clumsypilot/dotnetdebug:asp-debug-sample
  2. Open Localhost:5000 and verify thee website is running.
  3. Clone the Repo and open project DotnetDebug in VS2017
  4. Setup a remote connection over SSH
  5. Set a breakpoint in DebugSample/Pages/Index.cshtml.cs
  6. Start debugger and reload page!

Debugging In Action

Alternatively, debug this container while it's running on a kubernetes cluster using

kubectl port-forward <POD-NAME> 2222

For details, read my blogpost: https://blog.quickbird.uk/debug-netcore-containers-remotely-9a103060b2ff

Main Files

  • DebugSample - a sample Asp.Net Core 2.0 applicaitonconfigured for debugging. It will serve a static page on localhost:5000
  • DebugASP.Dockerfile - a dockerfile that builds a container with the asp applicaiton
  • Diagram.xml - Draw.io diagram to illustrate how debugging .Net Core applications works
  • DotnetDebug.Dockerfile - a dockerfile for buildings a debuggable base container for .Net Core applications. Used as base in *DebugASP.Dockerfile
  • StartSSHAndApp.sh - a script that starts two processes in Docker, the OpenSSH server and a .Net Core application
  • authorized_keys - keys authorised for connection to the OpenSSH server, config file that must be copied to root/.ssh/authorized_keys into the container.
  • privateKey.openssh and privateKey.ppk - OpenSSH Keys for Putty, corresponding to the *authorized_keys
  • sshd_config - a configuration file for OpenSSH server, that must be copied to /etc/ssh/sshd_config
  • DebugSample/MIEngineConfig/MIEngineAttach.json - A configuration file for MiEngine, used in Visual Studio 2017 to attach to a docker container for debugging.
  • DebugSample/.vscode/launch.json - A configuration file for Visual Studio Code with an Omnisharp Plugin to attach to a remote docker container for debugging
  • DebugSample/Pages/Index.cshtml.cs - set a breakpoint here on public void OnGet() and refresh the index page.