DockerのPython Imageとparse-crontabを使ってシンプルな定時処理batchを作る ref: http://qiita.com/shinyorke/items/77cd54bc836227b2416a

batch.py

#!/usr/bin/env python
# -*- coding: utf-8 -*-

import logging
from multiprocessing import Pool
from scheduler.job import JobController

__author__ = 'Shinichi Nakagawa'


# Docker ImageのTimezoneがUTCなので注意！
@JobController.run("20 15 * * 5")
def notice_tmr_club():
    """
    タモリ倶楽部の時間だお(東京)
    :return: None
    """
    logging.info("タモリ倶楽部はじまるよ！！！")


# Docker ImageのTimezoneがUTCなので注意！(大切なので2回言いました)
@JobController.run("00 9 * * *")
def notice_baseball():
    """
    やきうの時間を教えるお
    :return: None
    """
    logging.info("やきうの時間だあああ！！！！")


def main():
    """
    crontabを動かすmethod
    :return: None
    """
    # ログ設定(Infoレベル、フォーマット、タイムスタンプ)
    logging.basicConfig(
        level=logging.INFO,
        format="time:%(asctime)s.%(msecs)03d\tprocess:%(process)d" + "\tmessage:%(message)s",
        datefmt="%Y-%m-%d %H:%M:%S"
    )

    # crontabで実行したいジョブを登録
    jobs = [notice_tmr_club, notice_baseball]

    # multi process running
    p = Pool(len(jobs))
    try:
        for job in jobs:
            p.apply_async(job)
        p.close()
        p.join()
    except KeyboardInterrupt:
        logging.info("exit")


if __name__ == '__main__':
    main()

docker-compose.yml

batch:
  build: .
  dockerfile: ./Dockerfile
  command: python batch.py
  container_name: python_crontab_example

Dockerfile

# Python crontab sample

FROM python:3.5.1

MAINTAINER Shinichi Nakagawa <spirits.is.my.rader@gmail.com>

# add to application
RUN mkdir /app
WORKDIR /app
ADD requirements.txt /app/
RUN pip install -r requirements.txt
ADD ./scheduler /app/scheduler/
ADD *.py /app/

file4.txt

$ docker-compose up
Creating python_crontab_example
Attaching to python_crontab_example
python_crontab_example | time:2015-12-13 13:45:09.463   process:9       message:->- Process Start
python_crontab_example | time:2015-12-13 13:45:09.464   process:8       message:->- Process Start
python_crontab_example | time:2015-12-13 13:45:09.465   process:9       message:-?- next running        schedule:2015-12-18 15:20:00
python_crontab_example | time:2015-12-13 13:45:09.465   process:8       message:-?- next running        schedule:2015-12-14 09:00:00

job.py

#!/usr/bin/env python
# -*- coding: utf-8 -*-

import time
import functools
import logging
from crontab import CronTab
from datetime import datetime, timedelta
import math

__author__ = 'Shinichi Nakagawa'


class JobController(object):
    """
    ジョブ実行Controller
    """

    @classmethod
    def run(cls, crontab):
        """
        処理実行
        :param crontab: job schedule
        """
        def receive_func(job):
            @functools.wraps(job)
            def wrapper():

                job_settings = JobSettings(CronTab(crontab))
                logging.info("->- Process Start")
                while True:
                    try:
                        logging.info(
                            "-?- next running\tschedule:%s" %
                            job_settings.schedule().strftime("%Y-%m-%d %H:%M:%S")
                        )
                        time.sleep(job_settings.interval())
                        logging.info("->- Job Start")
                        job()
                        logging.info("-<- Job Done")
                    except KeyboardInterrupt:
                        break
                logging.info("-<- Process Done.")
            return wrapper
        return receive_func


class JobSettings(object):
    """
    出力設定
    """

    def __init__(self, crontab):
        """
        :param crontab: crontab.CronTab
        """
        self._crontab = crontab

    def schedule(self):
        """
        次回実行
        :return: datetime
        """
        crontab = self._crontab
        return datetime.now() + timedelta(seconds=math.ceil(crontab.next()))

    def interval(self):
        """
        次回実行までの時間
        :return: seconds
        """
        crontab = self._crontab
        return math.ceil(crontab.next())