Reverse Proxy dengan Nginx dan Golang untuk Microservices

2 min read .

Published on 06 Sep 2025

Reverse Proxy dengan Nginx dan Golang untuk Microservices

Saat aplikasi makin besar, memecahnya jadi beberapa service kecil (microservices) adalah pilihan bijak. Misalnya:

Service Product di port 8080
Service Blog di port 8081

Agar user tidak perlu tahu port-port tersebut, kita pakai Nginx reverse proxy untuk menyatukan semuanya di bawah satu domain.

1. Setup Nginx Reverse Proxy

Buat file konfigurasi Nginx:

sudo nano /etc/nginx/sites-available/yourdomain.com

Isi dengan konfigurasi berikut:

upstream api_product {
    server 127.0.0.1:8080;
}

upstream api_blog {
    server 127.0.0.1:8081;
}

server {
    listen 80;
    server_name yourdomain.com;

    # Proxy untuk service product
    location /product/ {
        proxy_pass http://api_product/;
        proxy_set_header Host $host;
        proxy_set_header X-Real-IP $remote_addr;
        proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
        proxy_set_header X-Forwarded-Proto $scheme;
    }

    # Proxy untuk service blog
    location /blog/ {
        proxy_pass http://api_blog/;
        proxy_set_header Host $host;
        proxy_set_header X-Real-IP $remote_addr;
        proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
        proxy_set_header X-Forwarded-Proto $scheme;
    }
}

Aktifkan konfigurasi:

sudo ln -s /etc/nginx/sites-available/yourdomain.com /etc/nginx/sites-enabled/

Cek apakah konfigurasi valid:

sudo nginx -t

Reload Nginx:

sudo systemctl reload nginx

2. Service Product

package main

import (
	"net/http"
	"github.com/gin-gonic/gin"
)

type Response struct {
	Message string    `json:"message"`
	Data    []Product `json:"data,omitempty"`
}

type Product struct {
	Name  string `json:"name"`
	Price int    `json:"price"`
}

func main() {
	r := gin.Default()

	r.GET("/", func(c *gin.Context) {
		c.JSON(http.StatusOK, Response{
			Message: "Success",
			Data: []Product{
				{Name: "Product 1", Price: 100},
				{Name: "Product 2", Price: 200},
				{Name: "Product 3", Price: 300},
			},
		})
	})

	r.POST("/create", func(c *gin.Context) {
		var product Product
		if err := c.ShouldBindJSON(&product); err != nil {
			c.JSON(http.StatusBadRequest, Response{Message: "Bad Request"})
			return
		}

		c.JSON(http.StatusCreated, Response{
			Message: "Product Created",
			Data:    []Product{product},
		})
	})

	r.Run(":8080")
}

3. Service Blog

package main

import (
	"net/http"
	"github.com/gin-gonic/gin"
)

type Response struct {
	Message string    `json:"message"`
	Data    []Article `json:"data,omitempty"`
}

type Article struct {
	Name    string `json:"name" binding:"required"`
	Content string `json:"content" binding:"required"`
}

func main() {
	r := gin.Default()

	r.GET("/", func(c *gin.Context) {
		c.JSON(http.StatusOK, Response{
			Message: "Success",
			Data: []Article{
				{Name: "Article 1", Content: "Content 1"},
				{Name: "Article 2", Content: "Content 2"},
				{Name: "Article 3", Content: "Content 3"},
			},
		})
	})

	r.POST("/create", func(c *gin.Context) {
		var article Article
		if err := c.ShouldBindJSON(&article); err != nil {
			c.JSON(http.StatusBadRequest, Response{Message: "Bad Request"})
			return
		}

		c.JSON(http.StatusCreated, Response{
			Message: "Article Created",
			Data:    []Article{article},
		})
	})

	r.Run(":8081")
}

4. Cara Akses

Jika semua sudah berjalan:

http://yourdomain.com/product/ → mengarah ke service product (port 8080).
http://yourdomain.com/blog/ → mengarah ke service blog (port 8081).

User hanya perlu mengakses domain, tanpa tahu detail port service di belakangnya.

5. Kesimpulan

Dengan konfigurasi sites-available → sites-enabled, Nginx bisa mengatur reverse proxy untuk berbagai microservice dengan lebih rapi. Digabung dengan Golang (Gin), kita bisa membuat service ringan dan cepat yang mudah diskalakan.