Debug inside Docker

Hi,

I got my project running in Docker and now I would like to use it also for debugging.

I was able to create a run configuration in PyCharm but the debug option fails for me and I don't really understand why. I googled around and it seems that there is another way using the Python Remote Debug option from the Run/Debug configuration window. And now here comes the thing I don't get.

Quoting from the help page

```
In order to debug with a remote interpreter, you have to start your program through PyCharm, which is not always possible. On the other hand, when using the Debug Server, you can connect to a running process.
```

If I understand this right it should mean that if I'm able to start my code with PyCharm inside a docker container (note that I'm really using a run configuration and not CMD inside Docker) it should also work for the Debug configuration. But the result is this error message:

```

9c7759ff5934:python -u /opt/.pycharm_helpers/pydev/pydevd.py --multiprocess --qt-support=auto --port 59431 --file /usr/local/bin/twistd --umask 0022 --nodaemon --pidfile= -l - cowrie
Unsupported setsockopt level=1 optname=15
Could not connect to None: 59431
Traceback (most recent call last):
File "/opt/.pycharm_helpers/pydev/pydevd.py", line 1649, in main
debugger.connect(host, port)
File "/opt/.pycharm_helpers/pydev/pydevd.py", line 326, in connect
s = start_server(port)
File "/opt/.pycharm_helpers/pydev/_pydevd_bundle/pydevd_comm.py", line 510, in start_server
s.setsockopt(SOL_SOCKET, SO_REUSEPORT, 1)
File "/usr/local/lib/python2.7/socket.py", line 228, in meth
return getattr(self._sock,name)(*args)
error: [Errno 92] Protocol not available

Process finished with exit code 1
```

OS: macOS High Sierra
PyCharm Professional 2018.2

Cheers