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How to pass command line argument to docker run and print it?

I created a .Net core 2.1 console application with docker (linux) support. Here is the system generated Dockerfile.

Dockerfile

FROM microsoft/dotnet:2.1-runtime AS base
WORKDIR /app

FROM microsoft/dotnet:2.1-sdk AS build
WORKDIR /src
COPY MyApp/MyApp.fsproj MyApp/
RUN dotnet restore MyApp/MyApp.fsproj
COPY . .
WORKDIR /src/MyApp
RUN dotnet build MyApp.fsproj -c Release -o /app

FROM build AS publish
RUN dotnet publish MyApp.fsproj -c Release -o /app

FROM base AS final
WORKDIR /app
COPY --from=publish /app .
ENTRYPOINT ["dotnet", "MyApp.dll"]


The console program just prints out the argument. (Console.WriteLine("The args are 0", args);)

Console.WriteLine("The args are 0", args);

However, docker run MyApp:dev doesn't print anything. And docker run MyApp:dev ABC got the following error.

docker run MyApp:dev

docker run MyApp:dev ABC

C:Program FilesDockerDockerResourcesbindocker.exe: Error response from daemon: OCI runtime create failed: container_linux.go:348: starting container process caused "exec: "ABC": executable file not found in $PATH": unknown.

I tried docker run -it MyApp:dev dotnet /app/MyApp.dll ABC and it got the error of

docker run -it MyApp:dev dotnet /app/MyApp.dll ABC

Did you mean to run dotnet SDK commands? Please install dotnet SDK from:
http://go.microsoft.com/fwlink/?LinkID=798306&clcid=0x409

Running docker run -it MyApp:dev dotnet shows the Usage of dotnet.

docker run -it MyApp:dev dotnet

dotnet

I tried docker run -it MyApp:dev bash and found the dirctory /app is empty. find . -name MyApp.dll cannot find anything?

docker run -it MyApp:dev bash

/app

find . -name MyApp.dll

1 Answer
1

It looks like what you're doing should work. I just made a repo here:

https://github.com/rquackenbush/DotNetCoreArgs

After building:

docker build .


I was able to run:

docker run <imageid> ABC


And I got:

Hello World!
There are 1 args.
ABC


docker run -it dotnet /app/MyApp.dll ABC

"Unable to find image 'dotnet:latest' locally C:Program FilesDockerDockerResourcesbindocker.exe: Error response from daemon: pull access denied for dotnet, repository does not exist or may require 'docker login'."

Did you mean to run dotnet SDK commands? Please install dotnet SDK from: http://go.microsoft.com/fwlink/?LinkID=798306&clcid=0x409

dotnet

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