A practical guide to Linux hardening
Summary
Trimstray collects verifiable measures for the boot chain, kernel, file systems, network, SSH, logging and restricting services. The guide is maintained publicly on GitHub. It covers several Linux distributions.
Ideas
- Minimal package sets reduce reachable code and maintenance effort.
- sysctl parameters harden network and kernel behaviour.
- Mount options restrict execution and device files in selected paths.
- Audit and system logs provide traces for later investigations.
Insights
- Hardening is a maintained system state rather than a one-off checklist.
- Every protective measure needs a verifiable threat and a fallback strategy.
- Secure default configurations scale better than manual rework.
Facts
- Many steps require administrative rights.
Recommendations
- Automatically test every change for reachability and service function.
- Document deviations with a reason and an expiry date.
References
Links to the original source and the Web Archive open in a new tab.