draft.py

import os
import subprocess
import logging
from signal import SIGTERM

# Setup logging
logger = logging.getLogger('__name__')
logger.setLevel(logging.INFO)
# Handler
stream = logging.StreamHandler()
stream.setLevel(logging.INFO)
# Formatter
formatter = logging.Formatter(
    '%(asctime)s - %(name)s - %(levelname)s - %(message)s')
stream.setFormatter(formatter)
logger.addHandler(stream)


def check_module_install(module):
    """
    Check if
        - docker
        - docker-compose
    installed or not
    """
    try:
        docker_output = subprocess.check_output(module + " -v", shell=True)
    except subprocess.CalledProcessError:
        raise ImportError("Please install {0}".format(module))
    if "command not found" in docker_output.decode("utf-8"):
        raise ImportError("Please install {0}".format(module))


def kill_process_by_port(ports):
    '''
    Kill the process by port number
    '''
    for port in ports:
        process = subprocess.run(
            ['lsof', '-ti:{0}'.format(str(port))], capture_output=True)
        # If any output
        if process.stdout:
            # May raise ProcessLookupError: [Errno 3] No such process
            pid = process.stdout.decode('utf-8')
            logger.info('Killing process {0} with port {1}'.format(pid, port))
            os.kill(int(pid), SIGTERM)


def run_docker_network():
    """
    Run docker network
    """
    output = subprocess.run(
        "docker network create nginx-proxy", shell=True, capture_output=True)
    if output.returncode:
        logger.info('nginx-porxy already created')


# check_install("docker")
# check_install("docker-compose")
# kill_process_port([8000])
run_docker_network()

Why do you need kill_process_by_port? Also all of this should just be managed by docker-compose. Maybe I'm misunderstanding the purpose of kill_process_by_port and run_docker_network. Can you clarify?