Individual skill
analyze-docker-runtime-errors
Analyzes Docker runtime errors for PHP containers. Identifies 502 Bad Gateway, OOM kills, connection refused, and permission issues.
skills/analyze-docker-runtime-errors/SKILL.md
Source commit 7e1fea8899b7994073951dfd1f6a10532ddbb867
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- Observed behavior
- Instructions only
- Last checked
- Nov 11, 2026
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- 106
- Repository last updated
- Aug 16, 2026
- License
- MIT
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- devops Derived category
- devops-containers Derived category
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# Docker Runtime Error Analysis
Analyze running PHP containers for runtime failures and provide targeted diagnosis and fixes.
## Runtime Error Categories
| Error | Symptom | Root Cause |
|-------|---------|------------|
| 502 Bad Gateway | Nginx returns 502 | PHP-FPM not running or crashed |
| OOM Killed | Container restarts | memory_limit or container limit exceeded |
| Connection refused | Service unreachable | Container not ready or wrong network |
| Permission denied | File operation fails | UID/GID mismatch or read-only fs |
| Segmentation fault | Process crashes | Extension bug or memory corruption |
| Slow requests | Timeouts, 504 errors | PHP-FPM pool exhaustion |