How Self-Reverting Watchdogs Save Broken SSH Sessions

What this episode covers

That frozen SSH terminal after a network change is every sysadmin's nightmare. This episode explores the self-reverting watchdog pattern — a dead man's switch for configuration changes that automatically undoes risky modifications if you lose connectivity. We break down the three-phase architecture: pre-flight snapshots, background timers, and confirmation handshakes through separate channels. Learn how to build a simple bash watchdog, why secondary SSH services and external verifiers prevent lockouts, and why this pattern is essential as AI agents increasingly make autonomous infrastructure changes without human hesitation.

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