Connecting to Streamlit Server (Status 503) after Deployment on Docker

Deployment
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1

I’ve deployed the Streamlit app using Docker. The UI loads correctly, but when I click the “Process” button to run the model, it shows the “Running…” status first (about few seconds), then switches to “Connecting to Streamlit Server,” followed by an error message shown below. I’ve tried different browsers (Chrome and Edge), but the issue persists. The app works perfectly when run locally.

The error message is:
Connection failed with status 503, and response "<html> <head><title>503 Service Temporarily Unavailable</title></head> <body> <center><h1>503 Service Temporarily Unavailable</h1></center> <hr><center>nginx</center> </body> </html> <!-- a padding to disable MSIE and Chrome friendly error page --> <!-- a padding to disable MSIE and Chrome friendly error page --> <!-- a padding to disable MSIE and Chrome friendly error page --> <!-- a padding to disable MSIE and Chrome friendly error page --> <!-- a padding to disable MSIE and Chrome friendly error page --> <!-- a padding to disable MSIE and Chrome friendly error page --> ".

Could this be a temporary server maintenance issue, or might it be caused by something else?

2

Through chrome “inspect”, found that the problem related to health check (see screenshot below). Has anyone fixed this error successfully before? Thanks!

Screenshot 2025-04-23 113715
Screenshot 2025-04-23 113715860×193 12.2 KB

3

Problem fixed by:

  • Comment out healthcheck related code
  • Adjust memory limit
4

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