Docker with Go cli project

Question

I use the following docker file which works as expected The project is a cli and when I run command docker run -it cli I got error from the cli (which is ok since the entry point is just running fzr ENTRYPOINT ["./fzr”])

Typically I run in on my machine like fzr -help or fzr version etc

I want that when I use command like docker run -it cli that I will be able to run commands inside the container

like fzr -help and fzr version, how can I do that ?

FROM golang:1.10.5 AS build-env


ADD https://github.com/golang/dep/releases/download/v0.4.2/dep-linux-amd64 /usr/bin/dep
RUN chmod +x /usr/bin/dep

RUN mkdir -p $GOPATH/src/github.com/fzr
WORKDIR  $GOPATH/src/github.com/fzr


COPY Gopkg.toml Gopkg.lock ./

# install project dep
RUN dep ensure 

COPY . ./

RUN  go build  -o /fzr

FROM scratch
COPY --from=build-env /fzr ./
ENTRYPOINT ["./fzr"]

What’s actually going wrong? What’s the actual docker run command and its actual output? — David Maze
– David Maze, Commented Dec 4, 2018 at 20:13

odk · Accepted Answer · 2018-12-04 19:34:55Z

1

TL;DR; docker run -it cli version

If you set ENTRYPOINT to your binary then everything that you pass after image name will be used as arg to that binary. If for some reason you need to overwrite entrypoint use --entrypoint flag to docker run.

answered Dec 4, 2018 at 19:34

odk

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1 Comment

David Maze Over a year ago

Since it’s a FROM scratch image, there’s nothing else you can possibly set the entrypoint to. You cannot, for example, get a shell in the container because there’s no /bin/sh.

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