Cron - levers9

Source: demo/cron/app.py in the repository. A function that runs itself on a cron expression. Time is always UTC.

cd demo/cron

# run the function once, right now (no cron involved)
python app.py

# deploy the cron: fires every two minutes and appends to demo-data/cron.log
levers9 deploy app.py:report --name every-2-minutes

# watch it fire
levers9 task list
levers9 ls demo-data
levers9 cp demo-data/cron.log ./cron.log && cat cron.log

# stop it
levers9 deployment list
levers9 deployment stop `deployment id`

Notes

when= takes a standard five-field cron expression, or a named one: @hourly, @daily, @weekly, @monthly, @yearly.
A cron is a deployment: stopping the deployment stops the cron; deploying again makes a new version and the old one is retired.
Use a volume (as here) or a return value stored elsewhere to keep results; a scheduled container is thrown away after each run.