Detailed explanation of Nginx's load balancing and high availability deployment solution
Introduction:
In today's Internet applications, high availability and load balancing are indispensable key elements. As a high-performance open source web server and reverse proxy server, Nginx is widely used to build high-availability and high-concurrency application architectures. This article will explain Nginx's load balancing and high availability deployment solutions in detail and provide corresponding code examples.
1. Overview of Load Balancing
Load balancing distributes network traffic to multiple servers to achieve balanced utilization of resources and improve the overall performance of the system. Nginx achieves load balancing through its reverse proxy function. In Nginx, you can define a group of backend servers by configuring upstream, and Nginx will distribute requests to different servers according to the set algorithm.
2. Commonly used load balancing algorithms
3. Load balancing configuration example
The following is a simple Nginx load balancing configuration example, using a polling algorithm to distribute requests to three back-end servers:
http { upstream backend { server 192.168.1.101; server 192.168.1.102; server 192.168.1.103; } server { listen 80; location / { proxy_pass http://backend; } } }
In the above configuration, we defined the addresses of three backend servers through upstream. In the server block, configure the location to proxy the request to the backend server. By default, Nginx uses a round-robin algorithm to distribute requests to backend servers.
4. High-availability deployment solution
In order to ensure the high availability of the system, we can deploy Nginx using a master-slave structure or a hot backup structure.
http { upstream backend { server 192.168.1.101; server 192.168.1.102 backup; } server { listen 80; location / { proxy_pass http://backend; } } }
In the above configuration, we added the backup keyword after the second server, indicating that the server will only be used when the main server is unavailable. Receive request.
http { upstream backend { server 192.168.1.101; server 192.168.1.102; } server { listen 80; location / { proxy_pass http://backend; } } }
In the above configuration, we defined two back-end servers and implemented load balancing through upstream. High-availability deployments can be achieved by configuring multiple servers and using load balancing algorithms.
Conclusion:
Nginx provides powerful load balancing and high availability deployment solutions. Through reasonable configuration, balanced utilization of resources and high availability of the system can be achieved. This article explains Nginx's load balancing and high availability deployment solutions in detail and provides corresponding code examples. I hope readers can use the guidance and examples in this article to build a high-availability and high-concurrency application architecture.
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