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docker-troubleshooting-knowledge

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Docker troubleshooting knowledge base. Provides debugging patterns, common error solutions, and diagnostic commands for PHP containers.

skills/docker-troubleshooting-knowledge/SKILL.md

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# Docker Troubleshooting Knowledge Base

Quick reference for debugging Docker containers in PHP projects.

## Common Build Errors

| Error | Cause | Solution |
|-------|-------|----------|
| `failed to compute cache key` | File not in build context | Check `.dockerignore`, verify file path |
| `returned a non-zero code: 137` | OOM during build | Increase Docker memory or reduce parallel ops |
| `Could not find package` | Composer can't resolve deps | Check `composer.lock`, mount auth secrets |
| `E: Unable to locate package` | Missing apt repository | Add required repo or use correct base image |
| `configure: error: ... not found` | Missing dev library | Install `-dev` package before ext install |
| `Permission denied` | Wrong user/permissions | Fix `chown`/`chmod` or adjust USER directive |
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