reboot

Rebooting one production server is easy; the hard part is the fencing. Lock pre-flight, the reboot module, and an uptime post-check that dares to fail.

TL;DR: An engineer built an Ansible playbook to reboot one server safely for kernel patching. The playbook guards against races with unattended-upgrades using lock checks, reboots, then verifies the operation by comparing uptime before and after. Manual invocation only, backed by 111 unit tests, because automated reboots turn one bug into nine downed servers.