nginx settings golang

In actual application scenarios, using the combination of Nginx and Golang can provide web services with good performance and high availability. This article will introduce how to reverse proxy Golang services through Nginx, and how to use Nginx for load balancing in Golang.

1. Nginx reverse proxy Golang service

Reverse proxy is a common server architecture that can improve performance and reliability. It works by sending a request from the client to a reverse proxy server, which then forwards the request to the actual server in the server cluster and returns the response to the client. Nginx reverse proxy is an excellent solution that is not only highly performant but can easily handle thousands of concurrent connections.

In practical applications, there are two main methods of reverse proxy: one is a virtual host based on domain name, and the other is based on URL path.

1. Domain name-based reverse proxy

Suppose your domain name is example.com, and there are two subdomains under this domain name, one is blog.example.com and the other is api .example.com. You want the two subdomains to point to different servers. Then your Nginx can be configured like this:

server {
    server_name blog.example.com;
    location / {
         proxy_pass http://your.blog.server;
    }
}

server {
    server_name api.example.com;
    location / {
         proxy_pass http://your.api.server;
    }
}

2. URL-based reverse proxy

Suppose you want to hand over requests for /blog and /api to different servers for processing. Then your Nginx can be configured like this:

location /blog/ {
    proxy_pass http://your.blog.server;
}

location /api/ {
    proxy_pass http://your.api.server;
}

In this way, when a client requests content on example.com/blog/, Nginx will forward the request to your.blog.server instead of returning local content. .

2. Golang uses Nginx for load balancing

1. Nginx configuration

Before using Golang client and Nginx for load balancing, you need to install it first Nginx and configure it.

The command to install Nginx on Ubuntu is as follows:

sudo apt-get update 
sudo apt-get install nginx

After the installation is completed, add the following content to the configuration file:

events {
    worker_connections  1024;
}

http {
    upstream your_go_server {
        server 127.0.0.1:8080;
        server 127.0.0.1:8081;
    }

    server {
        listen 80;
        server_name localhost;
        location / {
            proxy_pass http://your_go_server;
        }
    }
}

The upstream module here defines the load to be carried out Balanced server, and multiple servers can be configured for load balancing. The server module defines the Nginx load-balanced port. The / path in the location module indicates that Nginx will forward all requests.

2. Golang client code

To perform load balancing, you need to use a Golang HTTP client library on the client side and write a "find" function for Select the server in the load balancing server list.

func findServer() string {
    servers := []string{"http://127.0.0.1:8080", "http://127.0.0.1:8081"}   //要进行负载均衡的服务器列表
    n := len(servers)
    rand.Seed(time.Now().UnixNano())  //定义随机种子
    index := rand.Intn(n)  //生成随机数
    return servers[index]   //返回随机选择的服务器
}

Then, when making an HTTP request, you only need to add "findServer()" in front of the resource URL:

client := &http.Client{}
req, err := http.NewRequest("GET", findServer()+"/example", nil)
response, err := client.Do(req)

In this way, the Golang client code can pass Nginx's load balancing The system performs distributed processing well.

Summary

Implementing reverse proxy and load balancing through the combination of Nginx and Golang can improve application performance and high availability. The reverse proxy can forward client requests to the actual server for processing, while load balancing can balance the load of requests to avoid excessive load on a certain server. I hope the introduction and examples in this article can help you better use Nginx and Golang.

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