nginx+go-webserverをdocker-compose upで起動するサンプル

docker-compose.yaml

version: "3"
services:
  nginx:
    image: nginx:alpine
    ports:
      - "80:80"
    volumes:
      - ./nginx.conf:/etc/nginx/nginx.conf
      - sockets:/var/run/servers

  server:
    image: golang:alpine
    working_dir: /app
    command: go run .
    volumes:
      - ./:/app
      - sockets:/var/run/servers

volumes:
  sockets:

main.go

package main

import (
	"fmt"
	"log"
	"net"
	"net/http"
	"os"
)

func index(w http.ResponseWriter, r *http.Request) {
	fmt.Fprint(w, "hello world!!")
}

func main() {
	http.HandleFunc("/", index)
	os.Remove("/var/run/servers/go-http.sock")
	l, err := net.Listen("unix", "/var/run/servers/go-http.sock")
	if err != nil {
		log.Fatal(err)
	}
	if err := http.Serve(l, nil); err != nil {
		log.Println(err)
	}
}

nginx.conf

user  root;
worker_processes  auto;

error_log  /var/log/nginx/error.log warn;
pid        /var/run/nginx.pid;


events {
    worker_connections  1024;
}

http {
    include       /etc/nginx/mime.types;
    default_type  application/octet-stream;

    log_format  main  '$remote_addr - $remote_user [$time_local] "$request" '
                      '$status $body_bytes_sent "$http_referer" '
                      '"$http_user_agent" "$http_x_forwarded_for"';

    access_log  /var/log/nginx/access.log  main;

    sendfile        on;
    keepalive_timeout  65;

    upstream nginx-internal-sock {
        server unix:/var/run/servers/go-http.sock;
    }
    server {
        listen       80;
        server_name  localhost;

        error_page   500 502 503 504  /50x.html;
        location = /50x.html {
            root   /usr/share/nginx/html;
        }
        location / {
            proxy_set_header Host $host;
            proxy_set_header X-Real-IP $remote_addr;
            proxy_set_header Accept-Encoding "";
            proxy_pass http://nginx-internal-sock;
        }
    }
}

nginx.confのlocation内を

            fastcgi_pass   unix:/var/run/servers/go-fcgi.sock;
            include        fastcgi_params;

にしてgoのhttp.Serveをfcgi.Serveに変えるとFCGI連携もできる。