Can't build Golang in dockerfile

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I have this structure of my project: https://i.stack.imgur.com/SqqDh.png

And this is my Dockerfile:

FROM golang:1.19

ADD . /go/src/myapp

WORKDIR /go/src/myapp

RUN go mod init cloudmeta

RUN go get github.com/go-sql-driver/mysql
RUN go get -u github.com/gin-gonic/gin

RUN go build -o bin/cloudmeta

CMD [ "bin/cloudmeta" ]

When I trying to build my docker-container I have this error:

package cloudmeta/backend/handlers is not in GOROOT (/usr/local/go/src/cloudmeta/backend/handlers)
docker-compose docker go
1 Answers

When building Go code in docker, you shouldn't use go mod init. Take a look at the following example dockerfile from docker docs:

# syntax=docker/dockerfile:1

FROM golang:1.16-alpine

WORKDIR /app

COPY go.mod ./
COPY go.sum ./
RUN go mod download

COPY *.go ./

RUN go build -o /docker-gs-ping

EXPOSE 8080

CMD [ "/docker-gs-ping" ]

The docker docs guide goes into more depth but to summarise things:

  1. You should copy your go.mod and go.sum files into your project directory in the image.
  2. Now you can run the go mod download command to install the go modules required.
  3. Then you need to copy your source code into the image.
  4. Now you can compile your source code with the go build command.
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