Docker Worked Perfectly Until It Didnt

Docker promises: “Build once, run anywhere.”

What Docker actually delivers: “Works on my machine, but crashes on your server because Linux filesystems have 40 years of hidden permission quirks.”

---

🐛 The Nightmare Errors

You run docker-compose up expecting magic. Instead, you get:

• RWLayer of container is unexpectedly nil
• permission denied while mounting /var/run/docker.sock
• failed to solve: empty download URL

Every time you fix one layer of Linux permissions, an entirely different daemon error emerges.

---

💡 The Takeaway

Docker problems are rarely Docker problems. They are almost always Linux storage driver, overlay2 permission, or UID/GID mapping issues pretending to be container bugs. 🐳