Cron Error Handling: Capture, Retry, and Alert
Implement robust error handling in cron jobs: capture stderr, set up email alerts, use dead man's switches, and retry with exponential backoff.
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Tags: developer-tools, cron, error-handling
Cron Error Handling: Capture Failures, Retry, and Alert on Cron Jobs Cron jobs fail silently by default. Unless you have explicitly set up error handling, a crashing job produces no alert, no incident ticket, and no retry. The only indication something is wrong is when someone notices the downstream effect — stale data, missing reports, or a broken dependent process. This guide covers the complete error handling stack: capturing failures, configuring retries, making jobs safe to retry, and alerting. The Default Behavior (and Why It Is Dangerous) By default, cron: Runs the command If the command produces any output (stdout or stderr), emails it to Ignores the exit code This means a script that writes to stderr and exits 1 will appear to succeed from cron's perspective. The email might be…
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