Initial commit

Dockerfile

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+FROM ubuntu:xenial
+
+RUN apt-get update && \
+    apt-get install -y wget python3-pip python-pip cron && \
+    pip install --upgrade pip && \
+    pip3 install --upgrade pip && \
+    find /etc/cron* -type f -delete && \
+    touch /etc/crontab && \
+    useradd ubuntu && \
+    rm -rf /var/lib/apt/lists/*
+
+ADD start /start
+ADD crontab /etc/cron.d/base
+
+RUN chmod +x /start && \
+    mkdir -p /srv/cron && \
+    touch /srv/cron/crontab
+
+ENTRYPOINT ["/start"]

README.md

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+docker-cron
+===========
+
+Cron in a container. Run any random  crap you need.
+
+The following paths should be added:
+
+* `/srv/cron/startup` - a script to execute when the container starts
+* `/srv/cron/crontab` - /etc/cron.d-style crontab

crontab

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+SHELL=/bin/sh
+PATH=/usr/local/sbin:/usr/local/bin:/sbin:/bin:/usr/sbin:/usr/bin

start

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+#!/bin/bash -eux
+
+if test -x /srv/cron/startup ; then
+    /srv/cron/startup
+fi
+
+ln -s /srv/cron/crontab /etc/cron.d/
+
+exec cron -f