Before any Linux server we manage goes into production, it passes through a standard hardening checklist: disabling root SSH login, enforcing key-based authentication, configuring automatic security updates, restricting sudo access, and enabling a host-based firewall with a default-deny policy.
We also install centralized logging and basic intrusion detection (fail2ban or equivalent), and document every server in our configuration management system so changes are tracked over time — not applied ad hoc.
This checklist is distribution-agnostic and applies whether you are running RedHat, Ubuntu, Debian or SuSE; the specific tools differ, but the principles stay the same.
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