Docker cron example

cronpy

* * * * * root /app/task.py >> /var/log/task.log 2>&1

Dockerfile

FROM python:3.5.2

ENV TZ=Asia/Shanghai

RUN apt-get update \
    && apt-get install -y cron \
    && apt-get autoremove -y

COPY ./cronpy /etc/cron.d/cronpy
CMD ["cron", "-f"]

run.sh

#!/bin/sh

build() {
    docker build -t cronjob:latest $@ .
}

up() {
    docker run $@ \
        --name cronjob \
        -d \
        -v $(pwd)/task.py:/app/task.py \
        cronjob:latest
}

down() {
    docker rm -f -v cronjob
}

log() {
    docker logs cronjob $@
}

sh() {
    docker exec $@ -it cronjob bash
}

main() {
    Command=$1
    shift
    case "${Command}" in
        build)  build $@ ;;
        up)     up $@ ;;
        down)   down $@ ;;
        log)    log $@ ;;
        sh)     sh $@ ;;
        *)      echo "Usage: $0 {build|up|down|log|sh}" ;;
    esac
}

main $@

task.py

#!/usr/local/bin/python
from datetime import datetime
print("Cron job has run at {0} with environment variable ".format(str(datetime.now())))

remember to give task.py execution priviledge