[SOLVED] Unable to Connect PyCharm Debugger to Dockerized FastAPI Application

Unable to Connect PyCharm Debugger to Dockerized FastAPI Application

I’m struggling to set up remote debugging with PyCharm Professional for my FastAPI application running inside a Docker container. Despite numerous attempts and troubleshooting steps, I can’t get the debugger to connect.

IDE host Name: host.docker.internal
Port: 5678
Path Mapping: {project_path} =/app

My python script

try:
    import pydevd_pycharm
    pydevd_pycharm.settrace('host.docker.internal', port=5678, stdoutToServer=True, stderrToServer=True)
    logger.info("Debugger attached")
    logger.info("Starting program service")
except Exception as e:
    logger.info(f"Exception during debugger setup: {e}")

Docker compose

app:
  <<: *common_config
  environment:
    <<: *env_vars
  ports:
    - 8000:8000

Steps I Followed:

1.  I run the debugger in PyCharm first.
2.  Then I run docker compose up and start the container.

However, all I see in my logs is:

app-1 | 2024-11-26T15:58:15.177832Z [info ] Importing pydev_pycharm [code.api.main] dd.span_id=0 dd.trace_id=0

What could be going wrong?

Solution