Today we are going to learn about NGINX. Nginx is a high-performance open source web server and reverse proxy server that can efficiently handle high concurrent requests. The following are some of the main features and techniques of Nginx for handling high concurrency:
Combining the above features and technologies, Nginx can effectively handle high-concurrency requests and provide stable and high-performance services. It is widely used in the Internet field, especially in large websites, application server clusters and CDN (content distribution network) scenarios, playing an important role. IP hash is a load balancing algorithm that distributes requests to backend servers based on the client's IP address. Its basic principle is to calculate a hash value using a hash function based on the client's IP address, and then modulo the hash value with the length of the backend server list to determine which backend server the request should be sent to. Here are the brief steps of IP hashing algorithm:
The advantage of the IP hash algorithm is that for the same IP address, requests initiated at any time and from any place will be distributed to the same backend server, which can maintain session continuity and stability to a certain extent. But at the same time, it may cause load imbalance problems, because some IP addresses may be concentrated on certain specific backend servers, causing some servers to be overloaded. In Nginx, it is very simple to configure the load balancing strategy of IP hash algorithm. Just use the `ip_hash` directive in the configuration file to enable the IP hash algorithm. The following is an example configuration: In the above example, the `ip_hash` directive is used to define the `backend` backend server group. Requests are hashed based on the client's IP address and dispatched to the corresponding backend server. In summary, the IP hash algorithm is a commonly used load balancing algorithm in Nginx, which can distribute requests to backend servers according to the client's IP address to maintain the continuity and stability of the session. |
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