It's like cron, but kinda twisted.
You can either download the appropriate release from the releases page or install via go get:
go get -u github.com/ess/cronenberg/cmd/cronenberg
Cronenberg works similarly to the standard cron that you already know and love, but with a few differences:
- It is not meant to be run as a system service
- It does not use a traditional crontab
- Jobs for a given
cronenberginstance are loaded from a YAML file - It supports locking jobs (jobs that can only ever have one running instance)
- It logs to STDOUT
- It supports both incoming (from the system) and job-scoped environment variables
In short, this is the cron implementation that you run along side your 12-factor application.
There is not a hard-coded location for your jobs file. Instead, you pass the jobs file as the first argument to the cronenberg command like so:
cronenberg /path/to/my/jobs/file.yml
This is just a YAML file containing an array of Job objects. Here's an example jobs file:
# Job objects require a name, a command, and a schedule (when). You can also
# specify a description, whether or not the job locks, and a hash of environment
# variables for the job.
# This is just a normal job that runs every minute
- name: what-am-i
command: echo "I am a command"
when: "* * * * *"
# This is a locking job that is scheduled to run every minute so long as there
# is not already an instance of the job in progress.
- name: picky-picky
command: 'echo "I am a picky command" ; sleep 70'
when: "* * * * *"
lock: true
# This is a job that runs every five minutes and specifies an environment
# variable. If this variable is also set in cronenberg's executing shell, the
# value configured here takes precedence.
- name: know-your-environment
command: echo $flibberty
when: "*/5 * * * *"
env:
flibberty: gibbets- v1.0.0 - Initial Release
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