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Linux Server Hardening
Secure SSH, Firewalls, Services, Logs, and Backups in Practice
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A server on the public internet is probed within minutes, and the defaults are what scanners count on. This guide gives you an ordered, defensive routine to close that gap without a security department. You start with an inventory, then work through accounts and updates, key-only SSH with a safe way to change it, a firewall that denies by default, fewer and better-confined services, tighter file permissions, logs that survive and get read, and backups that an intruder cannot erase and that you have proved you can restore. Every chapter has short commands, a worked example from a fictional small shop and a clear list of common mistakes. A one-page checklist and a monthly routine keep the work true. Written for developers, small teams and self-hosters.
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