Cant launch chrome in docker linux container

RaptorGandalf

I have an asp.net core application that I am deploying in a linux docker container. I seem to be having trouble getting chrome to launch when I run a report. I am getting the error:

Failed to launch chrome!  Running as root without --no-sandbox is not supported.

I have followed the directions on the .net local reporting page here (https://jsreport.net/learn/dotnet-local) and made the neccesarry modifications for running chrome in linux, but I am still getting the error.

Here is my full docker file:

#use the .net core 2.1 runtime default image
FROM microsoft/dotnet:2.1-aspnetcore-runtime

#set the working directory to the server
WORKDIR /server

#copy all contents in the current directory to the container server directory
COPY . /server

#install node
RUN apt-get update -yq \
    && apt-get install curl gnupg -yq \
    && curl -sL https://deb.nodesource.com/setup_8.x | bash \
    && apt-get install nodejs -yq

#install jsreport-cli
RUN npm install jsreport-cli -g

#install chrome for jsreport linux
RUN apt-get update && \   
    apt-get install -y gnupg  libgconf-2-4 wget && \
    wget -q -O - https://dl-ssl.google.com/linux/linux_signing_key.pub | apt-key add - && \
    sh -c 'echo "deb [arch=amd64] http://dl.google.com/linux/chrome/deb/ stable main" >> /etc/apt/sources.list.d/google.list' && \
    apt-get update && \
    apt-get install -y google-chrome-unstable --no-install-recommends

ENV chrome:launchOptions:args --no-sandbox

#expose port 80
EXPOSE 80

CMD dotnet Server.dll

Is there another step that I am missing somewhere? Thanks in advance for any help!

jan_blaha

The same dockerfile works for me.
Is this your whole dockerfile? Don't you have there another building section?

RaptorGandalf

This is the entire docker file. I did find out that for some reason using CMD dotnet Server.dll made it so my program did not have access to the environment variables set in the docker file. If I set the environment variables in C#, just before running a report, everything worked fine. However, when I changded CMD dotnet Server.dll to ENTRYPOINT ["dotnet", "Server.dll"] I was able to run reports as expected.

jan_blaha

Thank you for sharing.

Now I see it also in the docs
https://docs.docker.com/engine/reference/builder/#cmd
CMD doesn't propagate variables.