How to debug a docker-compose service

Debug a docker-compose service

version: '3.1'
services:
  service_a:
    image: "fat_image"
    ports:
      - "6382:6382"

    volumes:
      - /home/dir1:/home/dirA
      - /home/dir2:/home/dirB
      - /home/dir3:/home/dirC
      - /home/dir4:/home/dirD
  data
    working_dir: /home/dirA/
    environment:
      - PYTHONHASHSEED=0
    command: ./the_most_complex_process.py

debug docker compose service

version: '3.1'
services:
  service_a:
    image: "fat_image"
    ports:
      - "6382:6382"

    volumes:
      - /home/dir1:/home/dirA
      - /home/dir2:/home/dirB
      - /home/dir3:/home/dirC
      - /home/dir4:/home/dirD
  data
    working_dir: /home/dirA/
    environment:
      - PYTHONHASHSEED=0
    command: tail -F anything # ./the_most_complex_process.py

Error

Doesn't work / throws an error.

Just go into the container and debug the same command by just making changes like this. 

gistfile1.txt

Fix the error looking at console or logs.

gistfile2.txt

Run the service again. All set