Michał Ży

My simple Swiss Army knife for http/https troubleshooting and profiling.

This guide details creating a secure Linux production system. OpenSCAP (C2S/CIS, STIG).

A practical guide for hardening Linux servers by reducing their attack surface, following CIS benchmarks and DISA STIG standards, with automated compliance scanning via OpenSCAP.

How to improve NGINX performance, security, and other important things.

A detailed Nginx reference handbook covering configuration, performance tuning, and security hardening, with printable cheat sheets, helper scripts, and a curated list of tools for server administrators.

A collection of inspiring lists, manuals, cheatsheets, blogs, hacks, one-liners, cli/web tools and more.

A massive curated collection of tools, cheatsheets, one-liners, and reference links for sysadmins, DevOps engineers, and security/penetration testers, organized into chapters covering CLI tools, networking, containers, hacking, and more.

A collection of Linux Sysadmin Test Questions and Answers. Test your knowledge and skills in different fields with these Q/A.

A collection of 284 questions and answers covering Linux system administration from beginner to advanced, organized by difficulty and topic, designed for self-study and interview preparation.

Nmap on steroids. Simple CLI with the ability to run pure Nmap engine, 31 modules with 459 scan profiles.

Simple checklist to help you deploying the most important areas of the GNU/Linux production systems - work in progress.

Iptables Essentials: Common Firewall Rules and Commands.

Create multiple TOR instances with a load-balancing.

Collection of IT whitepapers, presentations, pdfs; hacking, web app security, db, reverse engineering and more; EN/PL.

Open source security auditing tool to search and dump system configuration. It allows you to generate reports in HTML or RAW-HTML formats.

Open source tool to help you build a valid SSL certificate chain.

Wipe, reinstall or restore your system from running GNU/Linux distribution. Via SSH, without rebooting.

OpenSSH 2.3 up to 7.4 Mass Username Enumeration (CVE-2018-15473).

Personal blog [PL/EN].

Something about me.

Redis is an in-memory database that persists on disk. The data model is key-value, but many different kind of values are supported: Strings, Lists, Sets, Sorted Sets, Hashes, Streams, HyperLogLogs, Bitmaps.