Solo founder runs 85 Docker containers for €120/month using 176 custom Bash guards

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A solo developer in Germany operates a SaaS ecosystem serving golf clubs and related platforms, running 85 Docker containers across 67 domains on just two Hetzner servers at €120 per month. Each customer receives a physically isolated PostgreSQL database, a deliberate single-tenant design chosen to simplify GDPR data deletion and eliminate cross-tenant security risks. To manage the complexity, the developer relies on AI agents handling roughly 80% of daily operations, constrained by 176 shell scripts that enforce security and operational rules before any command executes. A cron-based watchdog script runs every five minutes to detect and restore failed containers from their last known good state. The setup demonstrates that rigorous automation and strict guard systems can make large-scale solo infrastructure management viable at low cost.

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