Understand the load balancer’s role
See how a shared entry point distributes requests across healthy backends.
- Describe the client, load balancer, backend pool, and health-check relationship.
A load balancer accepts traffic at a shared address and chooses a backend from a pool. It can spread work, stop sending new requests to unhealthy instances, and provide a stable entry point while backends change. It does not make an overloaded backend faster, and it can become a bottleneck or failure point unless its own capacity and availability are planned.
backends = ["app-a", "app-b", "app-c"]
for request, backend in enumerate(backends, start=1):
print(f"request {request} -> {backend}")request 1 -> app-a request 2 -> app-b request 3 -> app-c
The Python snippet illustrates a routing decision; it does not open sockets or balance real network traffic. In production, a load balancer may be a managed service, a proxy process, or functionality built into a platform.
Key takeaways
A balancer routes work among a backend pool.
Health checks guide routing but are imperfect signals.
Plan capacity and redundancy for the balancer itself.
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