simple cron with syntax checking and logging

Image is available via

docker.io/cdpb/cron:latest

Usage

services:
  cron:
    image: docker.io/cdpb/cron:latest
    environment:
      - CRON_CURL1=*/30 * * * * curl https://example.org
      - CRON_ANOTHERCRON=30 20 * * * curl https://my.website.com

docker run -d -e CRON_CURL1='*/5 * * * * curl https://example.org' docker.io/cdpb/cron

Syntax checking

Image uses buildin cronie syntax checking to discard any invalid cron expressions

docker run -e CRON_INVALID='*/5 * * * echo invalid' -e CRON_VALID='* * * * * echo valid' docker.io/cdpb/cron:latest

"/tmp/tmp.FHInBL_CRON_INVALID":1: bad day-of-week
Invalid crontab file. Syntax issues were found.
No syntax issues were found in the crontab file.
add CRON_VALID
Backup of root's previous crontab saved to /root/.cache/crontab/crontab.bak
debug flags enabled: misc
[1] cron started
log_it: (CRON 1) STARTUP (1.7.2)
log_it: (CRON 1) INFO (RANDOM_DELAY will be scaled with factor 32% if used.)
log_it: (CRON 1) No inotify - daemon runs with -i or -c option ()