The exposure score is not a verdict
Read systemd-analyze security for what it measures: what the unit declares, not what the service does — then tighten one directive at a time, proving the service still works.
20 minutesTechnical content last reviewed on 17 Sept 2026
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What this lesson builds
- Running a service under systemd, from first start to automatic recovery
- Knowing what the machine exposes, and closing the rest
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Users, sudo and SSH access
Create accounts, grant privileges with sudo, and secure SSH with keys — without ever locking yourself out.
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