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Horizontal Scaling Lab

Horizontal Scaling Request Flow Database Sharding Consistency

Read: When One Server Isn't Enough

Guided mission

Scale under load

Matches Lesson 1: horizontal scaling + load balancing. Do the steps, then compare 1 vs 3 servers.

Connect the load balancer to at least 2 app servers
Drag App Server from the left panel, then wire LB → each server
Press Play and process 30+ requests across servers
Watch request counts split between servers
Enable IPL traffic, add a 3rd server, keep CPU below 90%
Use the IPL Final button — then scale out before things melt

Servers: 1

LB connections: 1

Peak CPU: 0%

Components

Drag these to the canvas

Client

Initiates requests

Load Balancer

Distributes traffic

App Server

Processes requests

Database

Stores data

Cache

Fast data retrieval

Press enter or space to select a node.You can then use the arrow keys to move the node around. Press delete to remove it and escape to cancel.

Press enter or space to select an edge. You can then press delete to remove it or escape to cancel.

Total reqs0

In flight0

Peak CPU0%

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