Can you explain what a load balancing mechanism is between multiple servers?

The mechanism of distributing incoming traffic among multiple servers is called load balancing. Its task is to evenly distribute user requests among several servers to ensure high availability, scalability, and fault tolerance of the application.

Working principle:

• The load balancer accepts incoming requests.
• Based on the selected algorithm (e.g., round-robin, least connections, IP-hash), it redirects the request to one of the servers.
• The server processes the request and returns a response.

A simple example of a load balancer in Python using the socket library and the round-robin algorithm would be too bulky, but conceptually it can be represented as follows:

servers = ['server1:port', 'server2:port', 'server3:port']
current = 0

def get_next_server():
    global current
    server = servers[current]
    current = (current + 1) % len(servers)
    return server

# When a request is received
server = get_next_server()
# Redirect the request to server

In real systems, specialized load balancers (such as Nginx, HAProxy, AWS ELB) are used, which can monitor server status and distribute load more intelligently.