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How can I configure Go with Docker Compose such that the main.go file is in /cmd folder

I’ve been getting this error when I have main.go in /cmd folder rather than root:

| building...
| no Go files in /app
| failed to build, error: exit status 1

This is my Dockerfile:

FROM golang:1.22.1-alpine

WORKDIR /app

COPY . .

RUN go mod download

RUN go build -o main .

CMD ["/app/main"]

This is my docker-compose.yaml file:

version: "3"

services:
  main:
    container_name: myapp
    build:
      context: .
      dockerfile: ./Dockerfile
    ports:
      - ${GRPC_PORT}:9090
      - ${REST_PORT}:8080
    volumes:
      - .:/app
    develop:
    watch:
      - action: rebuild
        files:
          - ./**/*.go
          - ./go.mod
          - ./go.sum

I’ve tried many things todo with volumes and working directories but cannot see how to build and execute from the cmd folder.

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2

Answers


  1. Chosen as BEST ANSWER
    0

    I worked it out, here's an example repo and explanation article.

    https://github.com/clintvidler/go-docker-live-reload

    https://vidler.app/blog/golang/live-reloading-go-with-docker-compose/


  2. 0

    I assume that by "I have main.go in /cmd folder rather than root" you mean that your project is structured something like this:

    ├── cmd
│   ├── go.mod
│   └── main.go
├── docker-compose.yml
└── Dockerfile

    In that case this should work:

    🗎 Dockerfile

    FROM golang:1.22.1-alpine

WORKDIR /app

COPY cmd/ .

RUN go mod download

RUN go build -o main .

CMD ["/app/main"]

    🗎 docker-compose.yml

    version: "3"

services:
  main:
    container_name: myapp
    build:
      context: .
      dockerfile: ./Dockerfile

    🗎 main.go (A placeholder for your main.go.)

    package main

import (
    "fmt"
)

func main() {
    fmt.Println("Hello, World!")
}

    enter image description here

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