How to achieve load balancing in nginx

Load balancing configuration steps in Nginx: Install Nginx to configure Upstream server group to configure the listening port and set up proxy forwarding checks and restart Nginx to verify load balancing using curl

How to implement load balancing in Nginx

Nginx is a popular open source web server that can be used to achieve load balancing, thereby distributing network traffic to multiple servers. The following are the specific steps:

1. Install Nginx

Make sure you have Nginx installed on your server. For Debian/Ubuntu systems, you can use the following command:

 <code>sudo apt install nginx</code>

2. Configure the Upstream server

Create a new Nginx configuration file, such as /etc/nginx/conf.d/example.conf :

 <code>upstream my_servers { server server1.example.com; server server2.example.com; server server3.example.com; }</code>

This upstream block defines a server group named "my_servers" which contains three servers.

3. Configure the listening port

In the Nginx main configuration file /etc/nginx/nginx.conf , find the server block and add the following:

 <code>server { listen 80; server_name example.com; location / { proxy_pass http://my_servers; } }</code>

This server block listens for traffic on port 80 and forwards the request to the backend server using "my_servers" upstream.

4. Load the configuration and restart Nginx

 <code>sudo nginx -t sudo nginx -s reload</code>

• The -t option checks whether the configuration file is correct.
• The -s reload option reloads the Nginx configuration and applies changes.

5. Verify load balancing

Use the curl command to test load balancing:

 <code>curl -I http://example.com</code>

You will see an HTTP 200 OK response and the response header contains the server's IP address. Run this command multiple times and you will find that the response comes from different servers, which indicates that load balancing is working.

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