Build Docker with Go app: cannot find package

Question

I have my Dockerfile in the root of directory with src/myapp folder, myapp contains myapp.go with main package.

Dockerfi

Answer 1

After experiments I've come to this way of building Golang apps.

This way has several advantages:

• dependencies are installed on build stage

• if you need you may uncomment test options

• build first fully-functional image about 800 MB

• copies your program to an fresh empty image and produces very small image about 10 MB

Dockerfile:

# Two-stage build:
#    first  FROM prepares a binary file in full environment ~780MB
#    second FROM takes only binary file ~10MB

FROM golang:1.9 AS builder

RUN go version

COPY . "/go/src/github.com/your-login/your-project"
WORKDIR "/go/src/github.com/your-login/your-project"

#RUN go get -v -t  .
RUN set -x && \
    #go get github.com/2tvenom/go-test-teamcity && \  
    go get github.com/golang/dep/cmd/dep && \
    dep ensure -v

RUN CGO_ENABLED=0 GOOS=linux GOARCH=amd64 go build  -o /your-app

CMD ["/your-app"]

EXPOSE 8000



#########
# second stage to obtain a very small image
FROM scratch

COPY --from=builder /your-app .

EXPOSE 8000

CMD ["/your-app"]