stratolinux/cron-rclone repository overview

⁠cron-rclone

CentOS 7.5 based dockerfile that allows to register and execute rclone/cron tasks with ease.

It can:

• Mount cron jobs from a shared volume on host
• Create cron jobs from environment variable

⁠Environment variables:

• CRON_STRINGS - add cronjobs as environment variables. Example:

  CRON_STRINGS=* * * * * /any-command-you-wish
  

  Copy

  You can put multiple commands in CRON_STRINGS. Just use "\n" for newline.

• CRON_TAIL - if defined cron log file will be read to STDOUT by tail. By default cron runs in foreground mode.

⁠Mount cron files from host:

You can mount files from host as: /path/to/host/crontabs:/etc/cron.d, when container starts, it will copy all files from /path/to/host/crontabs into /etc/cron.d

⁠Where are my logs?

Cron debuging for scheduling is enabled, logs are in /var/log/cron

⁠Usage example:

⁠With cronjobs defined in folder mounted into container:

docker run -d \
-v /path/to/host/crontabs:/etc/cron.d \
-v /path/to/host/rclone.conf:/etc/rclone.conf \
stratolinux/cron-rclone

⁠With cronjob defined via environment variable:

docker run -d \
-v /path/to/host/crontabs:/etc/cron.d \
-v /path/to/host/rclone.conf:/etc/rclone.conf \
-e 'CRON_STRINGS=* * * * * docker ps' \
stratolinux/cron-rclone

⁠As a service in docker-compose.yml:

cron:
    image: stratolinux/cron-rclone
    volumes:
      - "/path/to/host/crontabs:/etc/cron.d"
      - "/path/to/host/rclone.conf:/etc/rclone.conf"
    environment:
      - CRON_STRINGS=* * * * * docker ps

⁠Special thanks

This Dockerfile was inspired by: https://github.com/timonweb/docker-cron-swissknife⁠, many thanks to timonweb for the ideas.

⁠Copyright

Copyright (c) 2018 Eric Young