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Lessons (8)

• Extending Kubernetes: CRDs, Operators and Admission

  … them when the parent goes. Admission control After authentication and authorization, admission can modify or reject requests before …

• RBAC and Cluster Security

  … RBAC, may you?] Z -- M[Admission: is it valid and allowed?] M -- E[(etcd)] RBAC building blocks Object …

• Internals, Upgrades, Resilience and Interview Questions

  … Store object (after authn, authz, admission) C- API: Watch: create ReplicaSet, then Pods S- API: Watch: bind unscheduled …

• Flash Sale: 10 Million Buyers, No Oversell

  … with rate limits and a bounded waiting room. Admission controls pressure but grants no inventory ownership. 2. Create …

• Resilient Service Calls: Retries, Breakers and Load Shedding

  … A breaker without admission control still leaves queues vulnerable. How to prove it worked Test partial failure and …

• The L6 System-Design Thinking Loop

  … Use a conditional seat reservation in the authoritative database; a queue only controls admission. 3. Persist a payment …

• 10,000 Users Do Not Need 10,000 Database Connections

  … remove the measured query/transaction bottleneck and limit admission. How to prove it worked Load-test with slow …

• 500 Users Upload Documents at Once: Design the Background Job Pipeline

  … tenant cannot occupy every worker Bounded queue and admission control The system says "try later" instead of accepting …