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Lessons (14)

• Scaling, Load Balancing & Rate Limiting

  … Each step solves a real, measured bottleneck. Load balancers A load balancer spreads requests across healthy servers and …

• Networking, DNS and Traffic Routing

  Understand the request path from OSI layers and DNS through load balancers, anycast and reverse proxies. ![Traffic routing …

• Services & Ingress

  … a stable name and IP that load-balances across a changing set of pods. An Ingress is the …

• CQRS & Event Sourcing

  … 42, balance: 120 } Handling a command js async function withdraw(accountId, amount) { const history = await eventStore.load( account …

• Structural Patterns: How to Connect Objects

  … lazy loading, caching, access control, logging, validation. js const user = { name: "Ana", role: "user", balance: 100 }; // JavaScript has …

• Why Kubernetes?

  … B Hard-coded IP addresses Service discovery and load balancing built in Passwords and config Baked into images …

• JavaScript Essentials: Event Loop, Closures & this

  … Private state (nobody outside can touch balance ) function createAccount() { let balance = 0; return { deposit: (amount) = (balance += amount), getBalance …

• How a Web Request Works

  Follow one click from the browser to the server and back, through DNS, TCP, TLS, HTTP, load balancers …

• API Gateway, BFF & Service Discovery

  … side discovery The client asks the registry and load-balances itself Netflix Eureka, Consul + client library Server-side …

• Caching & Redis

  … CDN["CDN edge<br/ images, JS, pages"] -- LB[Load balancer] -- App["App server<br/ in-memory cache"] -- R …

• Resilience Patterns

  … Load balancers and Kubernetes use these to route around sick instances. (See Kubernetes → Health Probes .) Putting it together …

• Kubernetes Cluster Architecture

  … load balancers, disks, node lifecycle Facilities team dealing with landlords ⚠️ etcd is the heart. Lose etcd without a …

• Topics, Partitions & Offsets

  … can be bigger than one disk). - Spread the load : writes and reads for different partitions happen on different …

• Scaling & Health Probes

  … isShuttingDown = true; // readiness now returns 503 setTimeout(() = { // give load balancers a moment to notice server.close(() = process.exit …