Setup Docker for Go development with hot reload

README.md

Usage

Start server: docker-compose up

Blog

This project first appeared on a blog post I wrote: https://rpereira.pt/programming/setup-docker-for-go-development/

docker-compose.yml

---
version: "3.7"
services:
  app:
    build: .
    image: hot-reloading-app
    ports:
      - "8080:8080" # Web Server
    volumes:
      - ./:/app
    environment:
      PORT: "8080"

Dockerfile

FROM golang:latest

RUN mkdir /app
WORKDIR /app
ADD . /app

RUN go get github.com/githubnemo/CompileDaemon
RUN go get github.com/gin-gonic/gin

ENTRYPOINT CompileDaemon --build="go build main.go" --command=./main

main.go

package main

import "github.com/gin-gonic/gin"

func setupRouter() *gin.Engine {
  r := gin.Default()

  r.GET("/ping", func(c *gin.Context) {
    c.JSON(200, gin.H{
      "message": "pong",
    })
  })

  return r
}

func main() {
  r := setupRouter()
  // listen and serve on 0.0.0.0:8080
  r.Run()
}

for Go 1.17+ instead of go get, otherwise you get command not found for CompileDaemon

RUN go get github.com/githubnemo/CompileDaemon

use go install which is the preferred way to install executable commands without changing module dependencies

RUN go install -mod=mod github.com/githubnemo/CompileDaemon