Tech World Software SchoolTWSS

from first concept to confident practice

Load Balancers

Route traffic deliberately and keep services available under changing load.

Start learning 6 lessons · first lesson about 12 min · free · no account needed
About this track

Learn how load balancers distribute connections and requests across backend pools. Compare Layer 4 and Layer 7 proxies, routing strategies, health checks, connection draining, session affinity, TLS termination, failover, and traffic observability. You’ll route simulated traffic, kill backends, tune health checks and read real headers and metrics.

Before you start
  • No load-balancing experience is required.
  • Basic networking familiarity is helpful but not required.

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  1. Unit 1 · 0/3 lessons

    Routing foundations

    Learn the balancer’s role, proxy layers, and selection algorithms. Badge: Traffic planner

    1. 0x001Understand the load balancer’s roleSee how a shared entry point distributes requests across healthy backends. 12 min 12 min
    2. 0x102Compare Layer 4 and Layer 7 balancingChoose between connection-level routing and application-aware routing. 12 min 12 min
    3. 0x203Choose a backend selection strategyCompare round robin, least connections, weights, and hashing. 12 min 12 min
  2. Unit 2 · 0/2 lessons

    Health and client state

    Manage backend lifecycle, sessions, and forwarded identity. Badge: Pool monitor

    1. 0x304Use health checks and connection drainingRemove failing instances carefully and let in-flight work finish. 12 min 12 min
    2. 0x405Handle sessions and client identityUnderstand sticky sessions, stateless services, and forwarded client addresses. 12 min 12 min
  3. Unit 3 · 0/1 lessons

    Reliable operations

    Protect traffic with TLS, failover, and observability. Badge: Resilience engineer

    1. 0x506Operate load balancers reliablyPlan TLS termination, zonal resilience, capacity, and useful traffic signals. 12 min 12 min