How to make the deployment compatible with Docker?

[guptakvgaurav]

I am trying to write a program which will simulate sensors installed in a room. This setup require customtkinter and kafka, therefore i decided to bundle them up in a docker for deployment convenience.

My problem is custom-tkinter is not able to initialize the App() problem due to absence (probably) of display module in the docker image. Hence, it comes up with the error and here are the logs

sensor_board_1  | Traceback (most recent call last):
sensor_board_1  |   File "/usr/src/app/./app.py", line 198, in <module>
sensor_board_1  |     app = App()
sensor_board_1  |   File "/usr/src/app/./app.py", line 28, in __init__
sensor_board_1  |     super().__init__()
sensor_board_1  |   File "/usr/local/lib/python3.9/site-packages/customtkinter/windows/ctk_tk.py", line 24, in __init__
sensor_board_1  |     super().__init__(*args, **kwargs)
sensor_board_1  |   File "/usr/local/lib/python3.9/tkinter/__init__.py", line 2270, in __init__
sensor_board_1  |     self.tk = _tkinter.create(screenName, baseName, className, interactive, wantobjects, useTk, sync, use)
sensor_board_1  | _tkinter.TclError: couldn't connect to display "0.0"
smart_home_sensor_board_1 exited with code 1

docker-compose.yml

# https://www.baeldung.com/ops/kafka-docker-setup
version: '2'
services:
  zookeeper:
    image: confluentinc/cp-zookeeper:latest
    environment:
      ZOOKEEPER_CLIENT_PORT: 2181
      ZOOKEEPER_TICK_TIME: 2000
    ports:
      - 22181:2181
  
  kafka:
    image: confluentinc/cp-kafka:latest
    depends_on:
      - zookeeper
    ports:
      - 29092:29092
    environment:
      KAFKA_BROKER_ID: 1
      KAFKA_ZOOKEEPER_CONNECT: zookeeper:2181
      KAFKA_ADVERTISED_LISTENERS: PLAINTEXT://kafka:9092,PLAINTEXT_HOST://localhost:29092
      KAFKA_LISTENER_SECURITY_PROTOCOL_MAP: PLAINTEXT:PLAINTEXT,PLAINTEXT_HOST:PLAINTEXT
      KAFKA_INTER_BROKER_LISTENER_NAME: PLAINTEXT
      KAFKA_OFFSETS_TOPIC_REPLICATION_FACTOR: 1
  
  sensor_board:
    build: ./sensor_board
    depends_on:
      - kafka
    volumes:
      - ./sensor_board:/usr/src/app
    environment:
      - DISPLAY=0.0

Dockerfile

FROM python:3.9 

WORKDIR /usr/src/app

COPY requirements.txt ./
RUN pip3 install --no-cache-dir -r requirements.txt

COPY . /usr/src/app/

CMD [ "python", "./app.py" ]