Linux Security for DevSecOps

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A hands-on Linux security course for DevSecOps learners focused on service exposure, web hardening, file permissions, sudo, secrets, root-run automation, service identity, runtime configuration, logs, scripts, and access policy cleanup. You will investigate real host state, apply targeted fixes, and verify that systems stay usable after hardening.

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Exercises

Index	Name	Difficulty	Practice
01	Audit Listening Services	Beginner	Start Challenge
02	Restrict Admin Interface to Localhost	Beginner	Start Challenge
03	Remove Unnecessary Public Port	Beginner	Start Challenge
04	Disable Web Directory Listing	Beginner	Start Challenge
05	Remove Exposed Backup Archive	Beginner	Start Challenge
06	Fix Unsafe Secret File Permissions	Beginner	Start Challenge
07	Fix World-Writable Web Directory	Beginner	Start Challenge
08	Remove Over-Permissive Sudo Rule	Intermediate	Start Challenge
09	Remove Hardcoded Credentials	Intermediate	Start Challenge
10	Harden Root-Run Cron Job	Intermediate	Start Challenge
11	Process Env Secret	Intermediate	Start Challenge
12	Dedicated Service User	Intermediate	Start Challenge
13	Log Write Boundary	Intermediate	Start Challenge
14	Debug Mode Cleanup	Intermediate	Start Challenge
15	App Policy Lockdown	Intermediate	Start Challenge
16	Service Env File	Intermediate	Start Challenge
17	Safe Script PATH	Intermediate	Start Challenge
18	Backup Path Boundary	Intermediate	Start Challenge
19	Diagnostic Endpoint	Intermediate	Start Challenge
20	Incident Bypass Cleanup	Advanced	Start Challenge

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