Using jobber as a cron alternative

Jobber is a tool written with a mindset of creating a simpler mechanism for scheduling jobs. It's written is GO so you need to install it in order to use jobber. you can download jobber as an rpm here.
Jobber does not daemonize on its own so we also need to install daemonize package which is available in EPEL repository.

Creating jobs:
Every individual user has their own set of jobs which will run with their privileges on the system. A users' jobs are defined in a jobfile named .jobber in the users' home directory. The jobs are defined in YAML format & it took me forever to get the syntax right.

Here is a test job I wrote:

[test@centops ~]$ cat .jobber
---
- name: test_job
  cmd: |
    uname
    uptime
  time: 0 0 13
  onError: Stop
  notifyOnError: true
  notifyOnFailure: false

[test@centops ~]$

The fields of a job definition are:

Time strings:

In order from left to right, these are the time components corresponding to the specifiers:

• second
• minute
• hour
• day of month
• month
• day of week

Every time you update the .jobber job file, you need to reload jobber as follows:

[test@centops ~]$ jobber reload

Loaded 1 jobs.

To list loaded jobs type:

[test@centops ~]$ jobber list

NAME      STATUS  SEC/MIN/HR/MDAY/MTH/WDAY  NEXT RUN TIME         NOTIFY ON ERR  NOTIFY ON FAIL  ERR HANDLER

test_job  Good    0 0 13 * * *              Sep 15 13:00:00 2016  true           false           Stop

To check whether the job is syntactically correct, we can test the job with 'jobber test':

[test@centops ~]$ jobber test test_job

Running job "test_job" for user "test"...

Job "test_job" succeeded.

New status: Good.

Stdout:

Linux

 11:10:54 up  1:27,  5 users,  load average: 0.05, 0.16, 0.13

Stderr:

Here is an example of a .jobber file consisting of more than one jobs:

[test@centops ~]$ cat .jobber

---

- name: test_job

  cmd: |

    uname

    uptime

  time: 0 0 13

  onError: Stop

  notifyOnError: true

  notifyOnFailure: false

- name: testjob

  cmd: df

  time: 0 1 17

  onError: Stop

  notifyOnError: true

  notifyOnFailure: false

[test@centops ~]$ jobber reload

Loaded 2 jobs.

[test@centops ~]$ jobber list

NAME      STATUS  SEC/MIN/HR/MDAY/MTH/WDAY  NEXT RUN TIME         NOTIFY ON ERR  NOTIFY ON FAIL  ERR HANDLER

test_job  Good    0 0 13 * * *              Sep 15 13:00:00 2016  true           false           Stop

testjob   Good    0 1 17 * * *              Sep 15 17:01:00 2016  true           false           Stop

[test@centops ~]$