Introduction

Dockerfile and scripts for creating image with Cron based on node:alpine. Inspired by xordiv/docker-alpine-cron.

Send job to rabbitmq for processing

Environment variables:

CRON_STRINGS - strings with cron jobs. Use "\n" for newline (Default: undefined)
CRON_TAIL - if defined cron log file will read to stdout by tail (Default: undefined)
By default cron running in foreground

Cron files

• /etc/cron.d - place to mount custom crontab files

When image will run, files in /etc/cron.d will copied to /var/spool/cron/crontab.
If CRON_STRINGS defined script creates file /var/spool/cron/crontab/CRON_STRINGS

Log files

Log file by default placed in /var/log/cron/cron.log

Simple usage:

docker run --name="alpine-cron-sample" -d \
-v /path/to/app/conf/crontabs:/etc/cron.d \
-v /path/to/app/scripts:/scripts \
xordiv/docker-alpine-cron

With scripts and CRON_STRINGS

docker run --name="alpine-cron-sample" -d \
-e 'CRON_STRINGS=* * * * * root /scripts/myapp-script.sh'
-v /path/to/app/scripts:/scripts \
xordiv/docker-alpine-cron

Get URL by cron every minute

docker run --name="alpine-cron-sample" -d \
-e 'CRON_STRINGS=* * * * * root wget https://sample.dockerhost/cron-jobs'
xordiv/docker-alpine-cron

TODO

• (read msg from cron queue / async create new every 1 sec or imidiatly) ?
• read cron endpoint, read created queue msg jobs for workers based on time.