Skip to content
Permalink
master
Switch branches/tags
Go to file
 
 
Cannot retrieve contributors at this time

Mr. Cron: Cloud Cron Scheduler

Cloud ready cron scheduler service. Mr. Cron will scrape multiple urls for cronjob data and execute (call desired urls). No additional services are needed.

MrCron Command flow

Features:

  • No database / persistence needed
  • No complex configuration
  • Handles up to 500 Cron Requests in parallel
  • Services define their own jobs (secret job-tokens can be applied)
  • UDP Syslog aware logging interface
  • Compatible to wildly used crontab format

Installation / Running MrCron

Just run the publicly available docker image from DockerHub:

docker run -e "CONF_SCRAPE_URLS=http://xy/mrcron.json" infracamp/mrcron

Configuration

Environment

CONF_SCRAPE_URLS

The urls to scrape for jobdef.json content. Multiple URLs can be specified separated by semicolon.

MrCron jobdef.json

{
  "jobs": [
    {
      "id": "Unique job identifier",
      "cron": "<cron timing def>",
      "urls": [
        "http://some.tld/to/call"  
      ]   
    },
    ..next job..
  ]
}

Cron timing def

* * * * *
┬ ┬ ┬ ┬ ┬
│ │ │ │ │
│ │ │ │ └──── Weekday (0-7, Sunday is 0)
│ │ │ └────── Month (1-12)
│ │ └──────── Day (1-31)
│ └────────── Hour (0-23)
└──────────── Minute (0-59)

Examples

* * * * *: Run the job each minute

0 * * * *: Will run the job once per hour at xx:00

0 0 * * *: Run the job daily at Midnight (00:00)

0 0 1 * *: Run the job on Midnight (00:00) on first day of the month

0 0 * * 0: Run the job on Midnight (00:00) on each Sunday (0 => Sunday)