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Lessons (9)

• Deployments, ReplicaSets & Rollouts

  … Deployments, ReplicaSets, labels and selectors, rolling updates, rollbacks, plus StatefulSets, DaemonSets and Jobs. The big idea A shift …

• Deploying & Operating Microservices

  … promote it through environments. - Rolling updates are the default; blue-green gives instant rollback; canary limits the blast …

• ACID, Transactions & Locks

  … either both commit or both roll back. ![A transaction either commits all related changes or rolls back; locks …

• Why Kubernetes?

  … Stop old, start new → downtime Rolling updates with zero downtime, and rollback "Which server has space?" Spreadsheets and …

• Helm, kubectl Cheat Sheet & Best Practices

  … 5 Update image kubectl set image deploy/shop-api api=repo/shop-api:1.9.1 Rollout status …

• Transactions, Indexes & Concurrency

  … Covers PDF questions 8-11 and 18. ![Correct updates: transactions protect invariants while indexes speed access and locks …

• SQL Language, Identifiers & Data Types

  … SELECT, INSERT, UPDATE and DELETE. DCL manages permissions: GRANT and REVOKE. Many systems call COMMIT and ROLLBACK transaction …

• Database Indexing & Transactions

  … let the database do it atomically sql UPDATE flights SET seats left = seats left - 1 WHERE id = 42 …

• ConfigMaps, Secrets & Storage

  … app-settings.json }] } Mounted as Updates when the ConfigMap changes? --- --- Environment variables ❌ Only when the pod restarts Files …