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Lessons (19)

• Helm, kubectl Cheat Sheet & Best Practices

  … api image: "{{ .Values.image.repository }}:{{ .Values.image.tag }}" resources: {{- toYaml .Values.resources nindent 12 }} yaml values.yaml values …

• Kubernetes Cluster Architecture

  … Back it up. - The scheduler filters and scores nodes using resource requests, affinity and taints. - Namespaces group resources …

• API Contracts, Gateways and Security

  … a gateway applies authentication, authorization, rate limits and routing before services enforce resource-level policy](/img/system-design …

• REST API Design

  … nouns in the URL, verbs in the HTTP method](/img/backend/rest-resources.svg) Rule 1: URLs are …

• Pods

  … What a pod is, why it can hold several containers, the pod lifecycle, sidecars and init containers, resource …

• Proxies, APIs and Real-Time Protocols

  … svg) Need Good starting point Trade-off --- --- --- Public resource API REST over HTTPS Familiar and cache-friendly Internal …

• Time, Consistency and Distributed Transactions

  … For exclusive work, use a lease plus fencing token that the protected resource rejects when stale. Avoid distributed …

• The L6 System-Design Thinking Loop

  … provider with the same key. Blast radius Shared resources spread incidents. An export exhausts checkout's DB pool …

• REST vs GraphQL vs gRPC

  … gRPC compared](/img/backend/api-styles.svg) REST: resources over HTTP http GET /users/42 GET /users/42 …

• ConfigMaps, Secrets & Storage

  … fast resources: requests: storage: 20Gi --- In the pod spec: volumes: - name: uploads persistentVolumeClaim: { claimName: uploads } containers[].volumeMounts: - { name …

• Scaling & Health Probes

  … Resource resource: name: cpu target: { type: Utilization, averageUtilization: 60 } % of the CPU request behavior: scaleDown: stabilizationWindowSeconds: 300 wait …

• Resilience Patterns

  … isolate resources Ships are divided into watertight compartments ( bulkheads ). A hole floods one compartment, not the whole ship …

• Deployments, ReplicaSets & Rollouts

  … 3000 }] resources: requests: { cpu: 250m, memory: 256Mi } limits: { memory: 512Mi } readinessProbe: httpGet: { path: /health/ready, port: 3000 } Labels …

• API Gateway, BFF & Service Discovery

  … moving parts, extra latency per hop and extra resources. Worth it with many services and strict security needs …

• Deploying & Operating Microservices

  … the golden signals - [ ] Alerts linked to a runbook - [ ] Resource limits (CPU/memory) and autoscaling rules - [ ] Config through environment …

• Services & Ingress

  … IC -- api…/products C{{catalog-api}} ⚠️ An Ingress resource does nothing by itself. You need an Ingress controller …

• Authentication, Authorization & API Security

  … Joi) - [ ] Parameterised queries / ORM - [ ] Authorization check on every resource access - [ ] Rate limiting on login and expensive endpoints - [ ] Secrets …

• Scaling, Load Balancing & Rate Limiting

  … and give it time to recover Bulkhead Separate resource pools, so one slow dependency can't consume every …

• Frontend Performance & Core Web Vitals

  … show the main content sooner mermaid flowchart LR T["TTFB<br/ server responds"] -- R["Resource load<br/ hero …