Cron Best Practices: Reliability and Observability
Write production-grade cron jobs. Cover idempotency, locking, alerting, output logging, timeout handling, and graceful failure recovery.
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Tags: developer-tools, cron, best-practices
Cron Best Practices: Write Reliable, Observable Scheduled Jobs Most cron jobs start simple and become a liability. They run silently, fail without alerting anyone, produce duplicate side effects when run twice, and leave stale processes running for hours. This guide covers the practices that separate throwaway scripts from production-grade scheduled jobs. --- Always Use Absolute Paths Cron runs with a minimal that typically includes only . Any command outside those directories will fail with "command not found" — silently, if you haven't set up logging. Find the full path with : Alternatively, set PATH at the top of your crontab: --- Capture All Output By default, cron sends stdout and stderr to local mail (). On most servers, nobody reads that mail. Failed jobs disappear unnoticed.…
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