Cron

Table of contents

• Usage
• Logrotate
• Crontab path

Usage

Running from terminal:

docker run -d -v /path/to/crontab:/etc/crontab liteacz/cron

Using docker-compose:

version: '3'
services:
  cron:
    image: liteacz/cron
    volumes:
    - /path/to/crontab:/etc/crontab

Logrotate

By default logrotate utility is provided with following configuration:

/var/log/cron.log {
    rotate 10
    size 10M
}

the file can be found in /etc/logrotate.conf.

Feel free to override it using your custom version, but make sure the file has 0644 (is not writable by group or others) otherwise logrotate will refuse to use it.

For more information see manual.

Crontab path

When container is started, it first looks for crontab file in /etc/crontab. This path can be changed via environment variable CRONTAB_PATH. E.g:

docker run -d \
  -e CRONTAB_PATH=/my/custom/crontab \
  -v /path/to/crontab:/my/custom/crontab \
liteacz/cron