Programming Tutorials

  You push your latest Docker container to a Hugging Face Space. The build logs show a successful image creation. You see "Building..." turn into "Running...". Then, ten seconds later, the status flips to "Runtime Error" or "Paused". The logs provide a cryptic hint:  Connection refused  or simply a silence where the application logs should be. For DevOps engineers and AI prototypers deploying custom stacks—particularly those involving Ollama, heavy CUDA dependencies, or custom Gradio endpoints—this is the most common friction point. The container runs perfectly on  localhost , yet fails immediately inside the Spaces infrastructure. This guide provides the root cause analysis for these networking failures and definitive, production-ready  Dockerfile  configurations to fix them. The Root Cause: Networking Interfaces and Port 7860 To fix the crash, you must understand the constraint. Hugging Face Spaces (specifically Docker Spaces) operate on a stri...