Run cron with supervisor and Docker on Alpine Linux

cron-with-supervisor-docker.md

docker/app/Dockerfile

# ...

# Run a cron job
ADD docker/conf/crontab.txt /crontab.txt
RUN /usr/bin/crontab /crontab.txt

# ...

docker/conf/crontab.txt

*/30 * * * * php /path/to/your/script.php

docker/conf/supervisord.conf

[supervisord]
nodaemon = true
...

[program:cron]
command=/usr/sbin/crond -f
user=root
autostart=true
autorestart=true