1. Introduction
Hello from Japan! 🇯🇵
I am an active truck driver in Japan self-studying Python, leveraging my logistics domain knowledge to become a Web Engineer.
(English is my second language, but I'm excited to share my journey with developers around the world!)
I started my self-study journey on May 12, 2026. In this article, I summarize the process of deploying Ruby on Rails 8 to a PaaS (Render Free Tier) and how I tackled the strict resource constraints I ran into.
Check out my GitHub here👈️
(Note: Most repository documentation and commits are currently in Japanese.)
2. Environment
- Development: Lenovo G580 (Lubuntu 24.04 LTS / 16GB RAM / Upgraded SSD)
- Production: Render (Free Tier: 512MB RAM)
- Testing Device: Xiaomi 15T
3. Challenges & Solutions
① Git Repository Structure Inconsistency
-
Issue: An unnecessary
.gitdirectory existed inside a subdirectory, causing errors during deployment. -
Solution: Deleted the nested
.gitdirectory to restore repository hierarchy integrity.
② Build Failure via Render Free Tier RAM Limit (512MB)
- Issue: Executing asset compilation on Render triggered Out-Of-Memory (OOM) crashes, forcibly killing the build process.
- Solution: Precompiled assets locally and committed the static files to the repository, significantly reducing memory usage on the production build server.
③ SQLite3 Write Permission Error
-
Issue: Encountered database write permission errors during CRUD operations in production. Render's file system is read-only by default, except for designated directories (such as
storage/). -
Solution: Updated
config/database.ymlto direct the SQLite3 database file to a path with write permissions (e.g., understorage/).
4. Conclusion
By applying these workarounds, I successfully verified the deployment and operation of a Rails 8 application on Render's Free Tier.
(Please note: Although production runtime works properly, because the setup prioritizes local configurations, some automated CI tests on GitHub currently report errors.)
For full source code and details, feel free to visit my repository:
👉 https://github.com/tosane932/rails_practice
