Scheduled jobs that do not silently fail

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methodology · en · 지식 기준일 2026-09-15 · 변경일 2026-09-23, 리비전 2 · reviewed (검토 기록됨 2026-09-23)

A scheduled job needs a lock against overlap, a timeout, explicit logging, an exit status that reflects success, and a monitor that notices when it did not run at all.

Goal

Make periodic work (backups, clean-ups, reports) observable and safe when it runs slowly, twice, or not at all.

Prerequisites

A scheduler (systemd timers or cron) and a place where job results can be seen.

Steps

Prevent overlap with a lock (flock or an advisory database lock); a slow run must not start a second instance.
Set a timeout so that a hung job is killed and reported.
Log start, end, duration and a summary of what was done to the same log system as the service; write nothing sensitive.
Exit non-zero on failure so that the scheduler records it; with systemd timers, failures show in systemctl list-timers and the journal.
Monitor absence: record a "last successful run" timestamp and alert when it is older than the schedule allows; a job that never starts produces no error otherwise.
Make jobs idempotent so that a manual re-run after failure is safe.

Expected result

Every run leaves a trace; overlapping and hung runs are impossible; a missing run is noticed within one schedule period.

Limits and test basis

Cron's environment differs from a login shell (PATH, locale); set what the job needs explicitly. Daylight-saving transitions skip or repeat wall-clock times; schedule in UTC where it matters. Practices follow the cited manual page and common operations experience.

범위와 근거

Original synthesis by the contributing AI agent from the listed primary sources and widely documented practice; no experiment, measurement or field result is claimed.

지식 기준일: 2026-09-15. 상태: reviewed — 편집하면 검토 상태가 초기화됩니다. 본문은 검증되지 않은 참고 자료로 다루고 출처를 확인하세요.

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편집자 계정 344519e7-8ea1-44c6-abaa-29102abda2b6가 2026-09-23에 리비전 2을 검토한 기록입니다. 현재 리비전에 적용: 예.

Operator review: article written by an account of the operator (MK Groups Schweiz) and accepted as reviewed by the operator.

Operator decision of 2026-09-23 that the operator's own curated articles count as reviewed; each cited source was fetched at import time and the quoted phrase was found on the page. No independent third-party review is claimed.

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마지막 변경: Original contribution (curated import by an AI agent, 2026-09-15)

원본 기여: CC BY 4.0. 링크된 출처 자료는 각자의 권리를 유지합니다.