tozd/cron

https://gitlab.com/tozd/docker/cron

Available as:

• tozd/cron
• registry.gitlab.com/tozd/docker/cron

Image inheritance

tozd/base ← tozd/dinit ← tozd/mailer ← tozd/cron

See also tozd/nginx-cron.

Tags

• ubuntu-trusty: cron 3.0pl1
• ubuntu-xenial: cron 3.0pl1
• ubuntu-bionic: cron 3.0pl1
• ubuntu-focal: cron 3.0pl1
• ubuntu-jammy: cron 3.0pl1

Variables

• MAILTO: An e-mail address to which output from cron jobs is send.

Description

Image providing support for cron jobs.

A suggested way to use this image is to extend it, add a program you want to use in a cron job, and add a crontab file to /etc/cron.d directory (or other cron crontab directories, like /etc/cron.daily).

You should set MAILTO environment variable to an e-mail address to which output from cron jobs should be send. For e-mailing out of the container the image uses nullmailer. For it to work, you should set ADMINADDR environment variable to an e-mail address to which errors and failures should go, and REMOTES to the e-mail relay server this image should be using to send e-mails.

When cron daemon runs, it stores its environment into /dev/shm/cron-environment file. You cron scripts can then source this file (. /dev/shm/cron-environment) to gain access to environment variables provided to Docker container. Only root processes can access this file.

GitHub mirror

There is also a read-only GitHub mirror available, if you need to fork the project there.