Step-by-step playbooks for when things go sideways. Interactive checklists with copy-paste commands.
Diagnose and fix a systemd service that fails to start or keeps crashing. Covers unit file inspection, dependency resolution, port conflicts, and manual testing.
Diagnose and fix Nginx 502 errors caused by unreachable or crashed backend services. Covers error log analysis, upstream health checks, and service recovery.
Fix a certbot renewal that's stuck failing. Covers HTTP-01 + DNS-01 challenges, rate limits, webroot + authenticator mismatches, and getting the cert pushed to services that cached the old chain.