linux
2 articles
A 6 A.M. DNS Disaster — When an Ubuntu Auto-Update Blew Up the Entire Sandbox
At 6 a.m., Ubuntu auto-updated, restarted systemd-resolved, overwrote resolv.conf, and erased a gVisor sandbox’s DNS configuration. Bun/axios then mislabeled SERVFAIL as ECONNRESET—turning six correct behaviors into one nondeterministic Cowork outage.
Unix Signals 101 — SIGUSR1 vs SIGTERM vs SIGKILL: What Secret Codes Does Your Process Understand?
While managing OpenClaw Gateway, SIGUSR1 enabled config hot-reload through three minutes of instability without killing sessions. A systemctl restart would have sent SIGTERM then SIGKILL and dropped everyone. That difference is today's lesson.