How to implement nginx load balancing

Nginx load balancing defines backend servers through the upstream module and uses the location block to proxy the requests to these servers. Supports load balancing strategies such as polling, minimum number of connections, response time weighting, and ip_hash. Configuration examples include defining an upstream group and pointing to it using the proxy_pass directive.

Nginx load balancing implementation

Nginx Load Balancing Definition

Nginx load balancing refers to distributing requested traffic to multiple backend servers through Nginx to improve the performance, stability, and scalability of your website or application.

Implementation method

Nginx load balancing is mainly implemented in the following ways:

• upstream module: Defines the backend server group and configures its health checking and load balancing policies.
• location block: Use the proxy_pass directive to proxy the request to the backend server defined by the upstream module.

Load balancing strategy

Nginx supports a variety of load balancing strategies, including:

• Polling: Assign requests to the backend server in order.
• Minimum number of connections: Assign requests to the server with the least number of connections.
• Response time weighting: According to the response time of the backend server, the request is allocated to the server with the shortest response time.
• ip_hash: hash the request to a specific backend server based on the client IP address.

Configuration example

Here is an example of a simple Nginx load balancing configuration:

 <code class="nginx">upstream backend { server 192.168.1.10:80 weight=1; server 192.168.1.11:80 weight=1; server 192.168.1.12:80 backup; } server { listen 80; location / { proxy_pass http://backend; } }</code>

This configuration uses 192.168.1.10 and 192.168.1.11 servers as the primary backend server, and uses the polling policy to allocate requests. 192.168.1.12 The server is a backup server and is enabled only when the primary server is unavailable.

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