Documentation
Guides, notes, and references
A curated collection of documentation pages and quick references. The focus is practical usage: safe defaults, repeatable steps, and troubleshooting patterns for Debian/Linux environments.
Use the menu on the right to jump to a page. New topics will be added over time.
What you will find here
Practical and structured content
- Mailserver: Postfix, Dovecot, Amavis, SpamAssassin, OpenDKIM, OpenDMARC, SPF/DMARC/DNS, and validation steps
- Webserver: Nginx baseline (Debian), hardened config, vhost templates, DNS-01 TLS, and RFC endpoints
- Linux Commands: daily command reference (awk, find, hashing, OpenSSL, etc.)
- Scripts: reusable scripts for automation and backups
- SSH Hardening: secure OpenSSH configuration patterns
- WireGuard: VPN installation and configuration on Debian
- Wireshark: traffic analysis filters and TLS inspection tips
- Debian OS Upgrade: safe approach for distribution upgrades