Create a systemd Override Safely

Set APP_MODE=maintenance for api.service without editing the package-owned unit file. systemd override workflow: inspect -> drop-in -> daemon-reload -> restart/reload -> verify -> rollback path Editing the vendor unit under package-managed directories creates a hidden fork that may be overwritten by upgrades and is harder to review. Inspect systemctl cat api.service Read the current composed unit so you know what exists and where local drop-ins will layer. Create drop-in systemctl edit api.service and add the minimal [Service] override. A drop-in under /etc/systemd/system/...d/ signals local admin intent and preserves the vendor unit. Reload manager systemctl daemon-reload systemd must reread unit definitions…

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