Would like to understand about the key IOTEDGE_APIVERSION in docker inspect output.

Question

I have a module running as part of azure iot edge and upon docker inspect of the module, I find key IOTEDGE_APIVERSION has a value 2020-07-07

"Env": [
                "IOTEDGE_APIVERSION=2020-07-07",
                "IOTEDGE_AUTHSCHEME=xxxx",
                "IOTEDGE_DEVICEID=xxxx",
                "IOTEDGE_GATEWAYHOSTNAME=xxxx",
                "IOTEDGE_IOTHUBHOSTNAME=xxxx",
                "IOTEDGE_MODULEGENERATIONID=xxxx",
                "IOTEDGE_MODULEID=sampleModule",
                "IOTEDGE_WORKLOADURI=unix:///var/run/iotedge/workload.sock",
                "RuntimeLogLevel=Information",
                "PATH=/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin",
                "ASPNETCORE_URLS=http://+:80",
                "DOTNET_RUNNING_IN_CONTAINER=true",
                "DOTNET_SYSTEM_GLOBALIZATION_INVARIANT=true",
                "DOTNET_VERSION=6.0.22",
                "ASPNET_VERSION=6.0.22"
            ],

I would like to understand how that value is decided and can that be controlled by the user, since it is a custom module.

I did try adding it as a ENV variable in the deployment manifest but it failed with an error that it is a duplicate key.

Answer 1

Hello @Arjun Sivasree,

welcome to this moderated Azure community forum.

I have see the same list of environment variables when I use this handy echo module.

Your custom module is based on a dotnet module (as seen in the 'Dockerfile' you use)

FROM mcr.microsoft.com/dotnet/sdk:6.0 AS build-env

This base layer introduces those environment variables.

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