NestJS · Senior · Question 28 of 75

What should a readiness check in Nest verify, and what should liveness avoid?

1Both should check every external API
2Liveness should check the database and restart on failure
✓Correct answer: Readiness checks dependencies needed to serve traffic (DB, cache); liveness should avoid external dependencies so an outage doesn't restart every pod

Explanation

A database outage that restarts all pods makes recovery worse. Liveness answers only 'is this process stuck?'.

Further reading

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