Linux Server Failing Gracefully with Systemd OnFailure

Episode 109 of Linux Server Admin with Fexingo dives into a powerful but often overlooked systemd feature: OnFailure=, which automatically triggers a rescue unit when a critical service fails. Lucas and Luna walk through a real-world scenario — a database server that needs to page the admin and attempt a safe restart without manual intervention. They cover how to pair OnFailure with a custom target, a notification script via mailx, and a delayed restart timer to avoid restart loops. The episode also touches on cgroup resource limits and journald log persistence to make auto-recovery truly robust. If you've ever woken up to a dead service at 3 AM, this one's for you.

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