dotnet restore works locally but fails when building Docker container

Question

If I create a new console application using dotnet classlib -lang f# -o hello-docker, cd into the directory and then run dotnet restore, everything works as expected.

However, if I add a Dockerfile with the following content

FROM microsoft/dotnet:2-sdk

WORKDIR /hello

COPY hello-docker.fsproj .
COPY *.fs ./

RUN dotnet restore

RUN dotnet build

ENTRYPOINT [ "dotnet", "run" ]

and run docker build ., it fails to reach nuget.org with the following message:

/usr/share/dotnet/sdk/2.0.0/NuGet.targets(102,5): error : Unable to load the service index for source https://api.nuget.org/v3/index.json. [/hello/hello-docker.fsproj]
/usr/share/dotnet/sdk/2.0.0/NuGet.targets(102,5): error : An error occurred while sending the request. [/hello/hello-docker.fsproj]
/usr/share/dotnet/sdk/2.0.0/NuGet.targets(102,5): error : Couldn't resolve host name [/hello/hello-docker.fsproj]
The command '/bin/sh -c dotnet restore' returned a non-zero code: 1

Why can I restore locally, but not inside the Docker container?

I think for some reason internet is not working in your Docker containers. Try restarting the docker VM from settings — Tarun Lalwani
– Tarun Lalwani, Commented Sep 27, 2017 at 6:50
Honestly not sure, try getting rid of docker and reinstalling it and see if it is of any help — Tarun Lalwani
– Tarun Lalwani, Commented Sep 27, 2017 at 8:34
Yeah, reinstalling docker did the trick. Weird, but I guess there was some firewall rule somewhere that borked it. Thanks! — Tomas Aschan
– Tomas Aschan, Commented Sep 28, 2017 at 6:27

Johan Leino · Accepted Answer · 2018-05-24 06:59:15Z

5

I fixed it by going into properties/sharing on my network adapter and shared it with the hyper-v/docker switch...think it was called nat or something.

answered May 24, 2018 at 6:59

Johan Leino

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2 Comments

Shankar S Over a year ago

Can you elaborate the steps you followed

ctoph Over a year ago

for me (on windows 10), i right clicked the wifi icon at the bottom right, click "Open network & Internet Settings" then click "Change adapter options", then right click the current adapter I was using for internet (wifi in my case), click properties, go to sharing tab, click "allow other network users to connect through this computer's internet connection" then from the dropdown i picked vEthernet (DockerNAT) or whatever is equivalent for your machine

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