jarnstedt/cron repository overview

FROM ubuntu:16.04

# Install cron
RUN apt-get update
RUN apt-get install -y cron

# Create the log file to be able to run tail
RUN touch /var/log/cron.log

# Run the command on container startup
CMD cron && tail -f /var/log/cron.log

# Print "Hello" every minute
RUN echo '* * * * * root echo "Hello" >> /var/log/cron.log 2>&1' > /etc/cron.d/crontab