What is round-robin load balancing

[bob]

Round robin load balancing spins requests around your servers in a steady cycle. I see you handling traffic this way often at work. You point each new connection to the next machine in sequence. Servers share the load without fancy rules getting in the way. But slower ones can still drag everything down if you ignore response times. I tried this setup once on a small cluster and watched queues build unevenly. You might notice sessions break when users hop between boxes without sticky tracking. Now think about DNS versions where names resolve in turns across IPs. I find it simple to set up yet it lacks real health checks so dead servers still get hits until you remove them manually. Perhaps you run into this during interviews when they quiz on basic distribution methods.
You keep cycling until the list restarts and starts over again. I explain it to juniors like you by comparing it to passing a ball in a circle during practice. Each server gets its turn but capacity differences cause hiccups over time. Or maybe your environment mixes fast and slow hardware which throws the balance off quickly. Then you add monitoring tools to catch those lags before complaints pile up. I prefer combining it with basic checks rather than pure rotation alone. You learn fast that it works best for stateless apps where no user data sticks around. Also watch for uneven hits if some machines restart often during maintenance windows.
I see round robin shine in testing labs where loads stay light and predictable. You test it by firing requests and counting distributions across nodes. But production needs tweaks like weighted versions when hardware varies. Perhaps you face questions on scaling this for bigger farms during job talks. I always stress keeping an eye on logs to spot patterns early. Then you adjust the order or drop weak performers from the rotation. Or add failover layers on top for better uptime overall. You gain practical edge by simulating failures and seeing how traffic shifts. I recall setups where pure cycling caused timeouts until we layered awareness of server states.
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