I’ve previously blogged about debugging .NET Docker containers in VS Code but recently I came across a problem with a container that I had a .NET Core application in failing to connect the debugger with the following error:
Executing: docker.exe exec -i sunshine-functions sh -s < /home/aaron/.vscode-remote/extensions/ms-vscode.csharp-1.19.1/scripts/remoteProcessPickerScript
Linux
stderr: sh: 1: ps: not found
Error Message: Command failed: docker.exe exec -i sunshine-functions sh -s < /home/aaron/.vscode-remote/extensions/ms-vscode.csharp-1.19.1/scripts/remoteProcessPickerScript
sh: 1: ps: not found
THe crux of the problem is that it’s unable to list the processes that I need to pick from in VS Code.
The image I was using as my base image was the Azure Functions Host, specifically mcr.microsoft.com/azure-functions/dotnet and it turns out that this particular image doesn’t have ps anywhere in it!
Thankfully, this is an easy fix, you need to install procps using apt install, assuming your image is from a distro that supports apt of course. 😉
Once ps is installed into your image you’ll now be able to list the processes and then debug your image.