2026-03-23  ·  AI Security Self-hosted

Running NemoClaw or OpenClaw Locally? Audit Your Server First.

An always-on AI agent is only as secure as the infrastructure it runs on. 5 checks before you go live.

2026-03-27  ·  Linux Security fail2ban SSH

Fail2ban is Misconfigured on Most Servers. Here's How to Check.

The default fail2ban configuration is wrong for Ubuntu 22.04 with systemd. Wrong backend, short ban times, inactive jail...

2026-03-27  ·  Docker Security DevOps Checklist

The Docker Compose Security Checklist Before You Go Live

10 Docker Compose security checks before deploying to a public server — exposed ports, hardcoded secrets, missing health...

2026-03-27  ·  Traefik Docker Reverse Proxy Migration

Traefik v3 Is Out. Here's What Broke in the Wild.

Traefik v3 silently breaks routes with no error output. Docker network configuration, old v1 labels, swarmMode removal —...

2026-03-30  ·  SSL Let's Encrypt Ubuntu systemd

certbot.timer on Ubuntu 22.04: How to Check, Fix, and Verify Auto-Renewal

How to check if certbot.timer is active on Ubuntu 22.04, fix a broken systemd timer, run a dry-run test, and verify Let'...

2026-03-30  ·  Nginx DevOps Linux Reverse Proxy

How to Test Your Nginx Config Before Reloading (nginx -t and Beyond)

nginx -t validates syntax but misses upstream errors, expired certs, and logic issues. How to test Nginx config safely, ...

2026-03-30  ·  Kubernetes Nginx Migration DevOps

Ingress NGINX Retired in 2026: Migration Guide and Alternatives

Ingress NGINX (kubernetes/ingress-nginx) was officially retired in March 2026. What this means, how to check if you are ...

2026-03-31  ·  Cron Linux DevOps Server

How Cron Job Overlaps Crash Your Server (And How to Find Them)

Overlapping cron jobs are one of the most common causes of mysterious server load spikes. How they happen, why they're h...

2026-03-31  ·  Cron Linux Sysadmin

Reading crontab -l Output Like a Sysadmin

How to read and understand crontab -l output — the five fields, special strings, environment variables, and what the com...

2026-03-31  ·  Cron Linux DevOps

Common Cron Scheduling Mistakes That Cause Real Problems

The cron scheduling mistakes that actually cause outages — midnight pile-ups, missing flock, silent failures, wrong time...

2026-03-31  ·  robots.txt SEO AI Web

AI Crawler Opt-Out: What robots.txt Can and Can't Do

Should you block AI crawlers in robots.txt? What GPTBot, ClaudeBot, PerplexityBot actually respect, what they ignore, an...

2026-03-31  ·  robots.txt SEO Google Crawling

Why Google Ignores Crawl-Delay in robots.txt (And What to Use Instead)

Google officially ignores the Crawl-delay directive in robots.txt. Why it was never adopted, what Googlebot actually use...

2026-03-31  ·  Docker Security DevOps

Hardcoded Secrets in Docker: How They Get Exposed and How to Find Them

Hardcoded secrets in docker-compose.yml are one of the most common causes of data breaches on self-hosted servers. How t...

2026-03-31  ·  SSH Linux Security DevOps

SSH Hardening on a Fresh Linux Server: The Practical Guide

How to harden SSH on a new Linux server — disable password auth, disable root login, change the port, set up fail2ban, a...

2026-04-01  ·  UFW Ubuntu Docker Linux Firewall

UFW and nftables on Ubuntu 22.04: What Changed and Why It Breaks Docker

Ubuntu 22.04 switched UFW's backend to nftables while Docker still uses iptables. Why this matters, how it affects your ...

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Practical guides for Linux server management, Docker security, SSL monitoring, and DevOps. Written for sysadmins, not academics.

2026-03-23  ·  Docker UFW Security

Docker Bypasses UFW. Here's Why — and How to Fix It.

UFW is active. You added a deny rule. Your Redis is still open. Here's what's actually happening and three ways to fix it.

2026-03-23  ·  Cron Linux DevOps

Cron Job Best Practices That Actually Matter

flock safety, staggered scheduling, output logging, PATH issues — the patterns that prevent silent failures.

2026-03-23  ·  SSL Monitoring DevOps

SSL Certificate Monitoring: Why 30 Days Is Too Late

The 200-day rule, CDN cert traps, and a simple bash script to catch expiry before it becomes an outage.

2026-03-23  ·  Ollama Security Self-hosted

Securing an Ollama Server: Don't Leave Your GPU Open to the Internet

Ollama binds to 0.0.0.0 by default. How to lock it down with localhost binding, Nginx auth, and Docker port safety.

2026-03-23  ·  Traefik Docker Migration

Traefik v2 to v3 Migration: What Actually Broke

Docker network requirements, removed options, deprecated v1 labels, and the static config changes that cause startup failures.