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Practical guide to building self-healing Linux servers with bash-first tools: use systemd restarts, limits and watchdogs; Monit health checks with automatic restarts/escalation; timers and scripts to free disk/log/tmp; unattended security updates with smart, need-based reboots; AIDE-driven drift detection and golden-config restore; plus distro-specific install cmds and safe tests to cut alert noise and MTTR.