Ceos3c
stefan@ceos3c:~$ cat README.md
Complicated Things - Made Easy
How I use AI to code, ship products, edit videos and run my own servers. Tested workflows and honest notes from a senior engineer building in public.
- 297tutorials
- 15topics
- since 2016
Critical Vulnerabilities October 2026: The Black October Patch List
Critical vulnerabilities October 2026: PHP2Shell, Broccoli2Shell, Plex2Shell, GitLab and more. What’s exploited, fixed versions and check commands.
Fresh from the lab
All AI Workflows
Web DevelopmentReact Server Components Vulnerability: How to Fix the RCE
The React Server Components vulnerability from October 2026 allows remote code execution. Check if you’re affected and patch React or Next.js.
Linuxsudo-rs Ubuntu 26.04: Fix the Errors or Switch Back to sudo
sudo-rs Ubuntu 26.04 errors, tested: wildcards are not allowed, unknown setting requiretty, Ansible timeouts. The fixes and the safe switch back.
Pick a topic
All Topics- $ cd ~/aiAI Workflows
Claude Code, MCP and AI coding workflows I use to ship my own products. Tested setups, real prompts and the parts that broke.
9 posts - $ cd ~/linuxLinux
Linux guides that explain what's going on: processes, memory, systemd, permissions, shell scripting and real error fixes.
74 posts - $ cd ~/securityCyber Security
Ethical hacking, Kali Linux, Metasploit, Nmap and bug bounty guides, written since 2016 and still updated. Beginner friendly.
54 posts - $ cd ~/web-developmentWeb Development
Web development tutorials: VS Code, Node, React, Next.js, Tailwind, JavaScript and TypeScript, explained step by step.
48 posts - $ cd ~/self-hostingSelf-Hosting
Self-hosting guides: VPS setups, NAS builds, Nextcloud, Plex, monitoring and backups on servers you control.
18 posts - $ cd ~/sysadminSysAdmin
Classic sysadmin guides: Windows Server, Group Policy, FOG imaging, UniFi and monitoring. Older, still used.
35 posts - $ cd ~/pythonPython
Python for beginners, one concept at a time: syntax, variables, lists, strings and exercises to practice with.
26 posts - $ cd ~/pfsensepfSense
pfSense guides for home labs and small offices: site-to-site VPN, OpenVPN, multi-WAN, DMZ, DNS and firewall rules.
18 posts - $ cd ~/indie-makingIndie Making
Building and selling my own products in public: launches, pricing, distribution, social proof and real revenue numbers.
12 posts
Latest
Older posts- #Cyber Security
Critical Vulnerabilities October 2026: The Black October Patch List
Critical vulnerabilities October 2026: PHP2Shell, Broccoli2Shell, Plex2Shell, GitLab and more. What’s exploited, fixed versions and check commands.
13 min - #Web Development
React Server Components Vulnerability: How to Fix the RCE
The React Server Components vulnerability from October 2026 allows remote code execution. Check if you’re affected and patch React or Next.js.
5 min - #Linux
sudo-rs Ubuntu 26.04: Fix the Errors or Switch Back to sudo
sudo-rs Ubuntu 26.04 errors, tested: wildcards are not allowed, unknown setting requiretty, Ansible timeouts. The fixes and the safe switch back.
7 min - #AI Workflows
Claude Code Plan Mode vs One-Shot: Same App, 5 Ways
Claude Code plan mode vs one-shot vs opusplan: I built the same app 5 ways and measured cost and time from the logs. Sonnet one-shot won.
10 min - #AI Workflows
Herdr: Run Claude Code Agents on Every Machine You Own
Herdr guide: install, the shortcuts that matter, four Claude Code agents in parallel worktrees, and Mac, Linux and Windows (WSL2) in one Herdr.
8 min - #AI Workflows
Higgsfield MCP: AI B-Roll in a Claude Code Video Pipeline
Higgsfield MCP in my Claude Code video pipeline: a shot plan from the transcript, stills first, Seedance 2.5 clips, a HyperFrames cut and 840 credits.
6 min - #AI Workflows
Reverse Engineer Anything: REA + Ghidra on a Game DLL
Reverse Engineer Anything (REA) + Ghidra + Claude on an old MMO’s game.dll: the setup, the exact prompt and an honest look at the results.
5 min - #AI Workflows
AI Coding Workflow: Orchestrating Agents With Roadmaps
My AI coding workflow: a roadmap board that plans the work, hands each tier to an agent with cheap subagents, and tracks what’s done. Full demo inside.
8 min - #Web Development
Developer Day Planning: Fit Work Around the Time You Have
Developer day planning starts with the hours already spoken for. Meetings, review duty, support requests, lunch and a hard stop all take time. Write those down first, then choose flexible work that fits the remainder. A calendar shows appointments. A task list shows intentions. Planning a developer day means looking at both before deciding how …
2 min - #pfSense
pfSense Site to Site VPN with IPsec: Step-by-Step Guide (2026)
In this article, you will learn how to create a pfSense site-to-site VPN tunnel between two pfSense firewalls!
3 min
Hi, I’m Stefan Rows
I started Ceos3c in 2016 and still write every guide by testing it on my own machines first. These days I build products with AI agents and share the workflows here.