Hi !
The post title is very descriptive, however let me share some more context on why I needed this scenario.
I’m currently working in an Azure IoT custom module. I got installed the Azure IoT extensions on Visual Studio Code, so everything works great on the Hello World mode. Once I wrote my code logic in C#, I can easily build my IoT Edge Solution.
My default configuration focus to an amd64 platform. I got this defined in my settings.json
{
"azure-iot-edge.defaultPlatform": {
"platform": "amd64",
"alias": null
}
}
This is a sample log output, using my local docker in Windows 10. Everything works fine.
[+] Building 0.7s (16/16) FINISHED
=> [internal] load build definition from Dockerfile.amd64 0.1s
=> => transferring dockerfile: 38B 0.1s
=> [internal] load .dockerignore 0.1s
=> => transferring context: 34B 0.1s
=> [internal] load metadata for mcr.microsoft.com/dotnet/core/runtime:3.1-buster-slim 0.5s
=> [internal] load metadata for mcr.microsoft.com/dotnet/core/sdk:3.1-buster 0.5s
=> [build-env 1/6] FROM mcr.microsoft.com/dotnet/core/sdk:3.1-buster@sha256:0fece15a102530aa2dad9d247bc0d05db6790917696377fc56a8465604ef1aff 0.0s
=> [internal] load build context 0.0s
=> => transferring context: 446B 0.0s
=> [stage-1 1/4] FROM mcr.microsoft.com/dotnet/core/runtime:3.1-buster-slim@sha256:e84300e54209cad66611b0b483cfe8c007d3bb5450388ff58e7f15d025917817 0.0s
=> CACHED [stage-1 2/4] WORKDIR /app 0.0s
=> CACHED [build-env 2/6] WORKDIR /app 0.0s
=> CACHED [build-env 3/6] COPY *.csproj ./ 0.0s
=> CACHED [build-env 4/6] RUN dotnet restore 0.0s
=> CACHED [build-env 5/6] COPY . ./ 0.0s
=> CACHED [build-env 6/6] RUN dotnet publish -c Release -o out 0.0s
=> CACHED [stage-1 3/4] COPY --from=build-env /app/out ./ 0.0s
=> CACHED [stage-1 4/4] RUN useradd -ms /bin/bash moduleuser 0.0s
=> exporting to image 0.0s
=> => exporting layers 0.0s
=> => writing image sha256:8d38fb01640fb566e761231c1a646df35bb83f24dfbb0fdea92bc4db62576e12 0.0s
=> => naming to <...>
If I want to change the target platform to build an arm32 image, I change my settings.json file to:
{
"azure-iot-edge.defaultPlatform": {
"platform": "arm32v7",
"alias": null
}
}
Note: if you don’t have this file, simply add a new settings.json file to the [.vscode] folder
However I got this ugly error, trying to build this
=> CACHED [build-env 2/6] WORKDIR /app 0.0s
=> CACHED [build-env 3/6] COPY *.csproj ./ 0.0s
=> ERROR [build-env 4/6] RUN dotnet restore 0.5s
------
> [build-env 4/6] RUN dotnet restore:
#10 0.450 A fatal error occurred, the folder [/usr/share/dotnet/host/fxr] does not contain any version-numbered child folders
------
executor failed running [/bin/sh -c dotnet restore]: exit code: 131
There seems to be an error here, outside of my docker knowledge.
Of course, a test path could involve the use of a remote ARM32 Docker Environment to build my Azure IoT Edge C# Module. I followed my previous posts steps to enable SSH password-less access to my Raspberry Pi and also manage docker as non-root users (see references).
Now I can define a specific DOCKER EXECUTOR to build my images. I changed my settings.json file to define this executor. Note that you must define a standard SSH connection, this may involve your device name or IP Address.
{
"azure-iot-edge.defaultPlatform": {
"platform": "arm32v7",
"alias": null
},
"azure-iot-edge.executor.env": {
"DOCKER_HOST": "ssh://pi@<Raspberry PI Address>"
}
}
Important: once you changed your settings.json configuration, you need to reload your VSCode environment. You can close and open the IDE, or even better, invoke the [Reload Window] command.
Now we can sucesfully build the Azure IoT module. the output log will be similar to this one:
Sending build context to Docker daemon 24.06kB
Step 1/12 : FROM mcr.microsoft.com/dotnet/core/sdk:3.1-buster-arm32v7 AS build-env
---> 3cdfdcca7cd6
Step 2/12 : WORKDIR /app
---> Using cache
---> 8c3252bfdefb
Step 3/12 : COPY *.csproj ./
---> Using cache
---> e6fe11cb659e
Step 4/12 : RUN dotnet restore
---> Using cache
---> 12453c83de65
Step 5/12 : COPY . ./
---> Using cache
---> 107c1dfccfa3
Step 6/12 : RUN dotnet publish -c Release -o out
---> Using cache
---> 603a93c80b0e
Step 7/12 : FROM mcr.microsoft.com/dotnet/core/runtime:3.1-buster-slim-arm32v7
---> 2bb8fc093aad
Step 8/12 : WORKDIR /app
---> Using cache
---> c8a93a2a7b90
Step 9/12 : COPY --from=build-env /app/out ./
---> Using cache
---> f72a492270ad
Step 10/12 : RUN useradd -ms /bin/bash moduleuser
---> Using cache
---> 082a4568867b
Step 11/12 : USER moduleuser
---> Using cache
---> 2c5e7b562289
Step 12/12 : ENTRYPOINT ["dotnet", "UDPFwder.dll"]
---> Using cache
---> f523123332f9
Successfully built f523123332f9
Successfully tagged <...>
SECURITY WARNING: You are building a Docker image from Windows against a non-Windows Docker host. All files and directories added to build context will have '-rwxr-xr-x' permissions. It is recommended to double check and reset permissions for sensitive files and directories.
And that’s it! Using a Raspberry Pi device to build Net Azure IoT modules seems to be the fix to build ARM32 platforms.
References
Happy coding!
Greetings
El Bruno
My posts on Raspberry Pi ⚡🐲⚡
Dev posts for Raspberry Pi
- How to grant permissions to a folder after git clone, to perform dotnet restore on a Raspberry Pi
- How to install .Net Core 3.1 in a Raspberry Pi 4
- Installing Visual Studio Code in a Raspberry Pi 4, run as root, fix black screen
- How to install .Net Core in a Raspberry Pi 4 and test with Hello World
- Build and Run C# NetCore projects in a Raspberry Pi 4 with Visual Studio Code
- Let’s do some Git dev in Raspberry Pi 4 (GitHub and Azure DevOps!)
- Install OpenCV
- Install Python 🐍 Virtual Environments in Raspberry Pi
- Setup SSH passwordless access to remote work with Docker 🐳
- Manage Docker 🐳 as a non-root user
- Build Docker 🐳 images from Visual Studio Code remotely using a Raspberry Pi
Tools and Apps for Raspberry Pi
- Where is my Task Manager in RaspberryPi? Let’s try htop
- Multi-monitor 📺 in Raspberry Pi 4 rocks !
- Double Commander on RaspberryPi4, because files are important
- How to install Docker 🐳 in a Raspberry Pi 4
- Installing Visual Studio Code in a Raspberry Pi
- Installing Visual Studio Code in a Raspberry Pi, run as root, fix black screen (Updated)
- 6 commands to install OpenCV for Python 🐍 in a Raspberry Pi 4
Setup the device
- 1st Setup without monitor 📺: auto connect to WiFi 📶, enable SSH, update and more
- Setup without monitor: enable VNC
- How to enable auto start with HDMI safe mode
- Running a Python 🐍 script in a Python Virtual Environment on reboot / startup
- Setup Wifi on Ubuntu
Hardware
- Ice Tower, the best cooler 🧊 for your device! From 70C to <40C in a 60 minutes process running at 100% in all 4 cores
- Intel Neural Stick 2, Performance differences in Face Recognition using OpenVino
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