Server load balancing is a method of distributing access traffic across multiple servers to improve performance, availability, and scalability. Setting up server load balancing requires choosing appropriate methods and tools based on specific circumstances, and ensuring that the load balancer is correctly configured and the health check mechanism is effective to ensure high availability and performance of the service.

　　The following are some common server load balancing methods and techniques:

　　DNS load balancing: By mapping the IP addresses of multiple servers to one domain name, requests are distributed to multiple servers through the DNS server. This method is simple and easy to use, but it cannot achieve fine traffic control and health checks.

　　Hardware load balancer: Use specialized hardware devices (such as load balancer hardware or application delivery controllers) to distribute traffic. These devices offer high performance, high availability, and the ability to monitor server health in real time.

　　Software load balancer: Install load balancing software, such as HAProxy, Nginx, Apache, etc., on the server to distribute traffic. These software load balancers offer more flexibility and customization options.

　　Reverse proxy: Set up a reverse proxy in front of the server to distribute requests to multiple backend servers. Reverse proxy can implement functions such as load balancing, caching and security control.

　　Session persistence: In some cases, it is necessary to maintain the consistency of user sessions to ensure that users do not lose session data when switching between multiple servers. Load balancers can be configured to persist sessions under certain circumstances.

　　Health check: The load balancer can regularly check the health status of the back-end servers. If a server is unavailable, it will be excluded from traffic distribution.

　　Algorithm: Load balancers use different algorithms to decide how to distribute traffic, such as round robin, weighted round robin, least connections, etc.

　　Cloud platform load balancing: On the cloud platform, automatic expansion and load balancing services are provided, and the number of instances can be automatically adjusted according to traffic conditions.