Debug Docker Container

gistfile1.txt

docker exec -it <container> /bin/bash

# Run the following commands inside the container
apt update
apt install -y gdb
apt install -y net-tools
pip install debugpy

# Find the PID for the Flask process. Always use the first that appear on the list
ps -ef

UID        PID  PPID  C STIME TTY          TIME CMD
root         1     0  0 14:09 ?        00:00:00 bash /app/docker/docker-bootstrap.sh app
root         6     1  4 14:09 ?        00:00:04 /usr/local/bin/python /usr/bin/flask run -p 8088 --with-threads --reload --debugger --host=0.0.0.0
root        10     6  7 14:09 ?        00:00:07 /usr/local/bin/python /usr/bin/flask run -p 8088 --with-threads --reload --debugger --host=0.0.0.0


# Inject debugpy into the running Flask process. In this case PID 6.
python3 -m debugpy --listen 0.0.0.0:5678 --pid 6

# Verify that debugpy is listening on port 5678

netstat -tunap

Active Internet connections (servers and established)
Proto Recv-Q Send-Q Local Address           Foreign Address         State       PID/Program name
tcp        0      0 0.0.0.0:5678            0.0.0.0:*               LISTEN      462/python
tcp        0      0 0.0.0.0:8088            0.0.0.0:*               LISTEN      6/python