Building a high-availability load balancing system: Best practices for Nginx Proxy Manager

Building a high-availability load balancing system: Best practices for Nginx Proxy Manager

Introduction:
In the development of Internet applications, a load balancing system is a must One of the essential components. It can achieve high concurrency and high availability services by distributing requests to multiple servers. Nginx Proxy Manager is a commonly used load balancing software. This article will introduce how to use Nginx Proxy Manager to build a high-availability load balancing system and provide some practical code examples.

1. Install Nginx Proxy Manager

1. Download and install Nginx Proxy Manager:

   $ wget http://nginx.org/download/nginx-1.20.1.tar.gz
   $ tar -zxf nginx-1.20.1.tar.gz
   $ cd nginx-1.20.1
   $ ./configure
   $ make
   $ sudo make install

2. Configure Nginx Proxy Manager:

   $ cd /etc/nginx/
   $ sudo vim nginx.conf

   Add the following content in nginx.conf:

   http {
       upstream backend {
           server server1.example.com;
           server server2.example.com;
           server server3.example.com;
       }
   
       server {
           listen 80;
           location / {
               proxy_pass http://backend;
           }
       }
   }

3. To achieve high availability
In order to achieve high availability, we can configure multiple Nginx Proxy Manager servers , and use Nginx's upstream module for load balancing. Here are some best practices:

1. Use domain name round robin (Round Robin):

   upstream backend {
       ip_hash;
       server server1.example.com;
       server server2.example.com;
       server server3.example.com;
   }

   The ip_hash directive can make every client request always be sent by the same End server processing.

2. Add health check:

   upstream backend {
       server server1.example.com;
       server server2.example.com backup;
       server server3.example.com;
       
       health_check interval=5s;
   }

   The health_check command can regularly check whether the backend server is available and temporarily remove the unavailable server from the load balancing pool to ensure that only Healthy servers participate in request processing.

3. Use weights:

   upstream backend {
       server server1.example.com weight=3;
       server server2.example.com weight=2;
       server server3.example.com weight=1;
   }

   The weight directive can allocate different weights according to the performance of the back-end server, thereby achieving more reasonable load balancing.

4. Monitoring and Tuning
In actual applications, we need to monitor the performance of Nginx Proxy Manager in real time and tune it to improve the stability of the system . Here are some suggestions:

1. Use the Nginx status module:
   Add the following in nginx.conf:

   location /nginx_status {
       stub_status;
   }

   By accessing http://your-domain /nginx_status, you can get Nginx status information, such as the total number of requests, the number of active connections, etc.

2. Tuning based on monitoring results:
   Through monitoring, we can find some performance bottlenecks, such as the number of connections exceeding the limit, request response time being too long, etc. Based on the monitoring results, we can adjust the configuration of Nginx Proxy Manager in a timely manner, such as increasing the number of worker_processes, adjusting the weight of the back-end server, etc.

5. Summary
This article introduces how to use Nginx Proxy Manager to build a high-availability load balancing system, and provides some practical code examples. Through reasonable configuration and monitoring and tuning, we can improve the performance and reliability of the load balancing system and provide users with a better service experience.

Reference materials:

• [Nginx official documentation](http://nginx.org/en/docs/)
• [Nginx Wiki](https: //wiki.nginx.org/Main)

Extended reading:

• [Nginx actual combat](https://book.douban.com/subject/26378178/ )
• [Nginx high-performance web server detailed explanation](https://book.douban.com/subject/6786600/)

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