Practical Tech Library
Evidence-backed fixes for self-hosted systems.
Use this hub to find diagnostics that BigBears reproduced on owned hardware and disposable fixtures. Every published guide names the tested environment, rejected shortcuts, safety boundaries, and rollback path.
Docker diagnostics
Begin with the symptom you can reproduce. Do not apply a broad permission or DNS change before isolating the failing layer.
Bind-mount Permission denied
A failed/fixed UID/GID lab plus read-only boundary, parent traversal, rootless/userns, SELinux, and rollback checks.
Open the permissions guide → DNSDNS returns 0.0.0.0
A differential test across host DNS, Docker embedded DNS, AdGuard Home, and an isolated resolver control.
Open the DNS guide →Publication gate
- A specific observed failure and user job.
- Owned logs, screenshots, commands, or measurements.
- One-variable failed/fixed comparison where possible.
- Safety caveats, verification, and rollback.
Current cluster boundary
The active cluster covers Docker and self-hosted stack diagnostics. Finance calculators and freelancer templates are retained as a legacy library, not mixed into this primary hub.