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From One Server to Exam-Day Ready
Série de tutoriels

From One Server to Exam-Day Ready

A five-part real-world case study of taking a growing exam and course platform (NovaCommerce, a fictional name) to high availability on DigitalOcean: the starting point, scaling the application layer, the database and AI data layer, Valkey, workers and logging, and the testing that shaped the final architecture.

5articles28 min au total
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Contenu de la série

1
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High Availability for Exam-Day Traffic: NovaCommerce, Part 1

A practical case study in finding failure points, defining availability and testing scheduled traffic before buying more servers.

Anichur Rahaman7min222
2

Ready Before the Exam: Scaling and Replacing Web Nodes — NovaCommerce 2

Two application pools helped a timed-exam platform grow. The harder work was proving readiness, draining old nodes and keeping one version of the service.

Anichur Rahaman5min226
3

The Database Moved. One Old Client Did Not — NovaCommerce 3

A 26-minute database cutover looked complete until a legacy panel wrote to the old copy. The lesson is writer control, reconciliation and honest recovery.

Anichur Rahaman5min285
4

The Result Was Fast. Its Queue Was Not — NovaCommerce 4

A 0.34-second result job waited behind slow AI work. Separate lanes helped, but durable submissions, bounded retries and worker recovery still mattered.

Anichur Rahaman5min249
5

Exam Night Was Evidence, Not a Capacity Guarantee — NovaCommerce 5

Two real exams, one scale-in mistake and a useful planning model. The final case review separates observations, extrapolation, operating costs and tests still owed.

Anichur Rahaman6min230